Moved more problems to Python.
parent
86e68eeee2
commit
0ab214633e
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@ -0,0 +1,12 @@
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from lib_prime import get_divisors_count
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from lib_misc import triangle_numbers
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def euler_012():
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for tn in triangle_numbers():
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if get_divisors_count(tn) > 500:
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return tn
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assert(euler_012() == 76576500)
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print("e012.py: {}".format(euler_012()))
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@ -0,0 +1,112 @@
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numbers_string = """
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37107287533902102798797998220837590246510135740250
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46376937677490009712648124896970078050417018260538
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74324986199524741059474233309513058123726617309629
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91942213363574161572522430563301811072406154908250
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23067588207539346171171980310421047513778063246676
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89261670696623633820136378418383684178734361726757
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28112879812849979408065481931592621691275889832738
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44274228917432520321923589422876796487670272189318
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47451445736001306439091167216856844588711603153276
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70386486105843025439939619828917593665686757934951
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62176457141856560629502157223196586755079324193331
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64906352462741904929101432445813822663347944758178
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92575867718337217661963751590579239728245598838407
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58203565325359399008402633568948830189458628227828
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80181199384826282014278194139940567587151170094390
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35398664372827112653829987240784473053190104293586
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86515506006295864861532075273371959191420517255829
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71693888707715466499115593487603532921714970056938
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54370070576826684624621495650076471787294438377604
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53282654108756828443191190634694037855217779295145
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36123272525000296071075082563815656710885258350721
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45876576172410976447339110607218265236877223636045
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17423706905851860660448207621209813287860733969412
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81142660418086830619328460811191061556940512689692
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51934325451728388641918047049293215058642563049483
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62467221648435076201727918039944693004732956340691
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15732444386908125794514089057706229429197107928209
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55037687525678773091862540744969844508330393682126
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18336384825330154686196124348767681297534375946515
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80386287592878490201521685554828717201219257766954
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78182833757993103614740356856449095527097864797581
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16726320100436897842553539920931837441497806860984
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48403098129077791799088218795327364475675590848030
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87086987551392711854517078544161852424320693150332
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59959406895756536782107074926966537676326235447210
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69793950679652694742597709739166693763042633987085
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41052684708299085211399427365734116182760315001271
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65378607361501080857009149939512557028198746004375
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35829035317434717326932123578154982629742552737307
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94953759765105305946966067683156574377167401875275
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88902802571733229619176668713819931811048770190271
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25267680276078003013678680992525463401061632866526
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36270218540497705585629946580636237993140746255962
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24074486908231174977792365466257246923322810917141
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91430288197103288597806669760892938638285025333403
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34413065578016127815921815005561868836468420090470
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23053081172816430487623791969842487255036638784583
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11487696932154902810424020138335124462181441773470
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63783299490636259666498587618221225225512486764533
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67720186971698544312419572409913959008952310058822
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95548255300263520781532296796249481641953868218774
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76085327132285723110424803456124867697064507995236
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37774242535411291684276865538926205024910326572967
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23701913275725675285653248258265463092207058596522
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29798860272258331913126375147341994889534765745501
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18495701454879288984856827726077713721403798879715
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38298203783031473527721580348144513491373226651381
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34829543829199918180278916522431027392251122869539
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40957953066405232632538044100059654939159879593635
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29746152185502371307642255121183693803580388584903
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41698116222072977186158236678424689157993532961922
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62467957194401269043877107275048102390895523597457
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23189706772547915061505504953922979530901129967519
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86188088225875314529584099251203829009407770775672
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11306739708304724483816533873502340845647058077308
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82959174767140363198008187129011875491310547126581
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97623331044818386269515456334926366572897563400500
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42846280183517070527831839425882145521227251250327
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55121603546981200581762165212827652751691296897789
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32238195734329339946437501907836945765883352399886
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75506164965184775180738168837861091527357929701337
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62177842752192623401942399639168044983993173312731
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32924185707147349566916674687634660915035914677504
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99518671430235219628894890102423325116913619626622
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73267460800591547471830798392868535206946944540724
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76841822524674417161514036427982273348055556214818
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97142617910342598647204516893989422179826088076852
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87783646182799346313767754307809363333018982642090
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10848802521674670883215120185883543223812876952786
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71329612474782464538636993009049310363619763878039
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62184073572399794223406235393808339651327408011116
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66627891981488087797941876876144230030984490851411
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60661826293682836764744779239180335110989069790714
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85786944089552990653640447425576083659976645795096
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66024396409905389607120198219976047599490197230297
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64913982680032973156037120041377903785566085089252
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16730939319872750275468906903707539413042652315011
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94809377245048795150954100921645863754710598436791
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78639167021187492431995700641917969777599028300699
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15368713711936614952811305876380278410754449733078
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40789923115535562561142322423255033685442488917353
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44889911501440648020369068063960672322193204149535
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41503128880339536053299340368006977710650566631954
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81234880673210146739058568557934581403627822703280
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82616570773948327592232845941706525094512325230608
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22918802058777319719839450180888072429661980811197
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77158542502016545090413245809786882778948721859617
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72107838435069186155435662884062257473692284509516
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20849603980134001723930671666823555245252804609722
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53503534226472524250874054075591789781264330331690
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"""
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def euler_013():
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numbers = [int(n) for n in numbers_string.split('\n') if n]
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numbers_sum = sum(numbers)
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return int(str(numbers_sum)[:10])
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assert(euler_013() == 5537376230)
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print("e013.py: {}".format(euler_013()))
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@ -0,0 +1,9 @@
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from lib_misc import collatz_sequence_length
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def euler_014():
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return max([(collatz_sequence_length(n), n) for n in range(1, 1000000)])[1]
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assert(euler_014() == 837799)
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print("e014.py: {}".format(euler_014()))
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@ -0,0 +1,21 @@
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from math import factorial
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def get_number_of_routes(n):
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"""
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There are n down and n right moves which means 2 * n moves
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in total. All permutations are calculated with (2n)!. Next redundant
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moves have to be canceled out. The combinations for only down moves
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or only right moves would (if they were different symbols) be n!.
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Hence, the denominator is (n!)^2.
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"""
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return factorial(2 * n) // (factorial(n) * factorial(n))
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def euler_015():
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return get_number_of_routes(20)
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assert(get_number_of_routes(2) == 6)
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assert(euler_015() == 137846528820)
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print("e015.py: {}".format(euler_015()))
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@ -0,0 +1,7 @@
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def euler_016():
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s = sum(map(int, str(2**1000)))
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return s
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assert(euler_016() == 1366)
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print("e016.py: {}".format(euler_016()))
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@ -0,0 +1,71 @@
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def single_digit_integer_to_spoken_language(n):
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if n == 0:
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return ""
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assert(n > 0 and n < 10)
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return {1: 'one', 2: 'two', 3: 'three', 4: 'four', 5: 'five',
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6: 'six', 7: 'seven', 8: 'eight', 9: 'nine'}[n]
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def double_digit_integer_to_spoken_language(n):
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assert(n > 9 and n < 100)
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try:
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return {
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10: 'ten', 11: 'eleven', 12: 'twelve', 13: 'thirteen',
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14: 'fourteen', 15: 'fifteen', 16: 'sixteen',
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17: 'seventeen', 18: 'eighteen', 19: 'nineteen'}[n]
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except KeyError:
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pass
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a, b = str(n)
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a = {2: 'twenty', 3: 'thirty', 4: 'forty', 5: 'fifty',
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6: 'sixty', 7: 'seventy', 8: 'eighty', 9: 'ninety'}[int(a)]
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b = integer_to_spoken_language(int(b))
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return a + '-' + b
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def triple_digit_integer_to_spoken_language(n):
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a, b = str(n)[0], str(n)[1:]
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a = single_digit_integer_to_spoken_language(int(a))
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b = integer_to_spoken_language(int(b))
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if not b:
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return a + " hundred"
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return a + " hundred and " + b
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def four_digit_integer_to_spoken_language(n):
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a, b = str(n)[0], str(n)[1:]
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a = single_digit_integer_to_spoken_language(int(a))
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b = integer_to_spoken_language(int(b))
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return a + " thousand " + b
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def integer_to_spoken_language(n):
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length = len(str(n))
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if length == 1:
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return single_digit_integer_to_spoken_language(n)
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elif length == 2:
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return double_digit_integer_to_spoken_language(n)
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elif length == 3:
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return triple_digit_integer_to_spoken_language(n)
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elif length == 4:
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return four_digit_integer_to_spoken_language(n)
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else:
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raise Exception("Length not supported.")
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assert(integer_to_spoken_language(5) == 'five')
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assert(integer_to_spoken_language(19) == 'nineteen')
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assert(integer_to_spoken_language(21) == 'twenty-one')
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assert(integer_to_spoken_language(210) == 'two hundred and ten')
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assert(integer_to_spoken_language(3000) == 'three thousand ')
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assert(integer_to_spoken_language(8333) ==
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'eight thousand three hundred and thirty-three')
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def euler_017():
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s = "".join([integer_to_spoken_language(i) for i in range(1, 1001)])
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s = s.replace(" ", "").replace("-", "")
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return len(s)
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assert(euler_017() == 21124)
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print("e017.py: {}".format(euler_017()))
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@ -0,0 +1,37 @@
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t = """
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75
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95 64
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17 47 82
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18 35 87 10
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20 04 82 47 65
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19 01 23 75 03 34
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88 02 77 73 07 63 67
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99 65 04 28 06 16 70 92
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41 41 26 56 83 40 80 70 33
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41 48 72 33 47 32 37 16 94 29
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53 71 44 65 25 43 91 52 97 51 14
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70 11 33 28 77 73 17 78 39 68 17 57
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91 71 52 38 17 14 91 43 58 50 27 29 48
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63 66 04 68 89 53 67 30 73 16 69 87 40 31
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04 62 98 27 23 09 70 98 73 93 38 53 60 04 23
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"""
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def find_greatest_path_sum_in_triangle_string(ts):
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from functools import reduce
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xss = [list(map(int, xs.split())) for xs in ts.split("\n") if xs]
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xss.reverse()
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def r(xs, ys):
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return [max([xs[i] + ys[i], xs[i + 1] + ys[i]])
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for i in range(len(ys))]
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return reduce(r, xss[1:], xss[0])[0]
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def euler_018():
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return find_greatest_path_sum_in_triangle_string(t)
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if __name__ == "__main__":
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assert(euler_018() == 1074)
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print("e018.py: {}".format(euler_018()))
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@ -0,0 +1,55 @@
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def weekday_generator_function():
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while True:
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yield 'Monday'
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yield 'Tuesday'
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yield 'Wednesday'
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yield 'Thursday'
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yield 'Friday'
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yield 'Saturday'
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yield 'Sunday'
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def day_of_month_generator_function():
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day, month, year = 1, 1, 1901
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while year < 2001:
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yield day
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day += 1
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if month == 2:
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if year % 4 == 0 and (not year % 100 == 0 or year % 400 == 0):
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if day == 30:
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month += 1
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day = 1
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elif day == 29:
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month += 1
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day = 1
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elif month in [9, 4, 6, 11] and day == 31:
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day = 1
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month += 1
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elif month in [1, 3, 5, 7, 8, 10] and day == 32:
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day = 1
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month += 1
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elif month == 12 and day == 32:
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day = 1
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month = 1
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year += 1
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def euler_019():
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wds = weekday_generator_function()
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next(wds) # get rid of first Monday
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ds = zip(wds, day_of_month_generator_function())
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s = len([1 for weekday, date in ds if weekday == "Sunday" and date == 1])
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return s
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def euler_019_brain():
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""" We have 100 years which means
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1200 months. Every months starts with a day
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and 1/7 of all days are Sundays. """
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return 1200 // 7
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if __name__ == "__main__":
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assert(euler_019() == 171)
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assert(euler_019() == euler_019_brain())
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print("e019.py: {}".format(euler_019()))
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@ -0,0 +1,7 @@
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def euler_020():
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return 0
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if __name__ == "__main__":
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assert(euler_020() == 1074)
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print("e020.py: {}".format(euler_020()))
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@ -0,0 +1,11 @@
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from e018 import find_greatest_path_sum_in_triangle_string
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def euler_067():
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with open("../txt/EulerProblem067.txt") as f:
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return find_greatest_path_sum_in_triangle_string(f.read())
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if __name__ == "__main__":
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assert(euler_067() == 7273)
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print("e067.py: {}".format(euler_067()))
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@ -1,3 +1,6 @@
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from functools import lru_cache
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def get_digits_reversed(n):
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"""
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Returns a list of digits for n.
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@ -76,3 +79,59 @@ def product(l):
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from functools import reduce
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import operator
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return reduce(operator.mul, l, 1)
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def triangle_numbers():
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c = 0
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i = 1
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while True:
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c += i
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yield c
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i += 1
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def even(n):
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"""
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Returns true if a number is even.
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"""
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return n % 2 == 0
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def odd(n):
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"""
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Returns true if a number is odd.
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"""
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return n % 2 != 0
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def collatz_sequence(n):
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"""
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Returns collatz sequence for n.
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:param n: collatz sequence
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"""
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cs = []
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while n != 1:
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cs.append(n)
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n = n // 2 if n % 2 == 0 else 3 * n + 1
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cs.append(n)
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return cs
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@lru_cache(maxsize=1000000)
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def collatz_sequence_length(n):
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"""
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Returns length of collatz sequence for n.
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:param n: collatz sequence
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"""
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if n == 1:
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return 1
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length = 1
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while odd(n):
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n = 3 * n + 1
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length += 1
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return length + collatz_sequence_length(n // 2)
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@ -5,12 +5,20 @@ try:
|
|||
from .lib_misc import get_digits_reversed
|
||||
from .lib_misc import get_item_counts
|
||||
from .lib_misc import product
|
||||
from .lib_misc import triangle_numbers
|
||||
from .lib_misc import even, odd
|
||||
from .lib_misc import collatz_sequence
|
||||
from .lib_misc import collatz_sequence_length
|
||||
except ModuleNotFoundError:
|
||||
from lib_misc import is_palindrome_integer
|
||||
from lib_misc import is_palindrome_string
|
||||
from lib_misc import get_digits_reversed
|
||||
from lib_misc import get_item_counts
|
||||
from lib_misc import product
|
||||
from lib_misc import triangle_numbers
|
||||
from lib_misc import even, odd
|
||||
from lib_misc import collatz_sequence
|
||||
from lib_misc import collatz_sequence_length
|
||||
|
||||
|
||||
class TestPrimeMethods(unittest.TestCase):
|
||||
|
@ -42,6 +50,26 @@ class TestPrimeMethods(unittest.TestCase):
|
|||
self.assertEqual(product([2, 4, 8]), 64)
|
||||
self.assertEqual(product([]), 1)
|
||||
|
||||
def test_triangle_numbers(self):
|
||||
f = triangle_numbers()
|
||||
self.assertEqual(next(f), 1)
|
||||
self.assertEqual(next(f), 3)
|
||||
self.assertEqual(next(f), 6)
|
||||
self.assertEqual(next(f), 10)
|
||||
self.assertEqual(next(f), 15)
|
||||
self.assertEqual(next(f), 21)
|
||||
|
||||
def test_even_odd(self):
|
||||
self.assertTrue(odd(3))
|
||||
self.assertTrue(even(4))
|
||||
self.assertFalse(even(3))
|
||||
self.assertFalse(odd(4))
|
||||
|
||||
def test_collatz(self):
|
||||
self.assertEqual(collatz_sequence(13),
|
||||
[13, 40, 20, 10, 5, 16, 8, 4, 2, 1])
|
||||
self.assertEqual(collatz_sequence_length(13), 10)
|
||||
|
||||
|
||||
if __name__ == '__main__':
|
||||
unittest.main()
|
||||
|
|
|
@ -1,7 +1,9 @@
|
|||
try:
|
||||
from lib_misc import get_item_counts
|
||||
from lib_misc import product
|
||||
except ModuleNotFoundError:
|
||||
from .lib_misc import get_item_counts
|
||||
from .lib_misc import product
|
||||
|
||||
|
||||
def prime_factors(n):
|
||||
|
@ -107,3 +109,36 @@ def primes(n_max):
|
|||
if b[i - 1]:
|
||||
ps.append(i)
|
||||
return ps
|
||||
|
||||
|
||||
def get_divisors_count(n):
|
||||
"""
|
||||
Returns the number of divisors for n.
|
||||
The numbers 1 and n count as a divisor.
|
||||
|
||||
>>> get_divisors_count(1)
|
||||
1
|
||||
>>> get_divisors_count(3)
|
||||
2 # 1, 3
|
||||
>>> get_divisors_count(4)
|
||||
3 # 1, 2, 4
|
||||
|
||||
Getting the number of divisors is a combinatorial
|
||||
problem that can be solved by using the counts
|
||||
for each prime factor. For example, consider
|
||||
|
||||
2 * 2 * 7 = 28
|
||||
|
||||
We have 3 options for 2 (1, 1 * 2, 2 * 2)
|
||||
and 2 options for 7 (1, 1 * 7).
|
||||
|
||||
By multiplying those options we get the number
|
||||
of combinations:
|
||||
|
||||
2 * 3 = 6
|
||||
"""
|
||||
if n == 1:
|
||||
return 1
|
||||
factors = prime_factors_count(n)
|
||||
count = product([v + 1 for v in factors.values()])
|
||||
return count
|
||||
|
|
|
@ -5,12 +5,14 @@ try:
|
|||
from .lib_prime import is_prime
|
||||
from .lib_prime import prime_nth
|
||||
from .lib_prime import primes
|
||||
from .lib_prime import get_divisors_count
|
||||
except ModuleNotFoundError:
|
||||
from lib_prime import prime_factors
|
||||
from lib_prime import prime_factors_count
|
||||
from lib_prime import is_prime
|
||||
from lib_prime import prime_nth
|
||||
from lib_prime import primes
|
||||
from lib_prime import get_divisors_count
|
||||
|
||||
|
||||
class TestPrimeMethods(unittest.TestCase):
|
||||
|
@ -23,6 +25,7 @@ class TestPrimeMethods(unittest.TestCase):
|
|||
self.assertEqual(prime_factors(147), [3, 7, 7])
|
||||
|
||||
def test_prime_factors_count(self):
|
||||
self.assertEqual(prime_factors_count(1), {})
|
||||
self.assertEqual(prime_factors_count(2), {2: 1})
|
||||
self.assertEqual(prime_factors_count(147), {3: 1, 7: 2})
|
||||
|
||||
|
@ -59,6 +62,15 @@ class TestPrimeMethods(unittest.TestCase):
|
|||
self.assertEqual(primes(25), [2, 3, 5, 7, 11, 13, 17, 19, 23])
|
||||
self.assertEqual(primes(1), [])
|
||||
|
||||
def test_get_divisors_count(self):
|
||||
self.assertEqual(get_divisors_count(1), 1)
|
||||
self.assertEqual(get_divisors_count(3), 2)
|
||||
self.assertEqual(get_divisors_count(6), 4)
|
||||
self.assertEqual(get_divisors_count(10), 4)
|
||||
self.assertEqual(get_divisors_count(15), 4)
|
||||
self.assertEqual(get_divisors_count(21), 4)
|
||||
self.assertEqual(get_divisors_count(28), 6)
|
||||
|
||||
|
||||
if __name__ == '__main__':
|
||||
unittest.main()
|
||||
|
|
Loading…
Reference in New Issue