Clean up and get ready for two sum assignment

misc/birthday_problem.py

@@ -0,0 +1,16 @@
+def p_all_different(n):
+    p = 1
+    free_days = 365
+    days_year = 365
+    for i in range(0, n):
+        p = p * (free_days / days_year)
+        free_days -= 1
+    return p
+
+
+if __name__ == "__main__":
+    for i in range(1, 30):
+        print(f"p_all_different({i})={p_all_different(i)}")
+        if  p_all_different(i) < 0.5:
+            break
+

misc/merge_sort.py

@@ -0,0 +1,37 @@
+
+def merge(a, b):
+    """Merges two sorted lists"""
+    i, j = 0, 0
+    r = []
+    while i < len(a) and j < len(b):
+        if a[i] < b[j]:
+            r.append(a[i])
+            i += 1
+        else:
+            r.append(b[j])
+            j += 1
+
+    while i < len(a):
+        r.append(a[i])
+        i += 1
+
+    while j < len(b):
+        r.append(b[j])
+        j += 1
+    return r
+
+
+def merge_sort(v):
+    length = len(v)
+    if length <= 1:
+        return v
+
+    half_length = length // 2
+
+    a = merge_sort(v[:half_length])
+    b = merge_sort(v[half_length:])
+    return merge(a, b)
+
+
+if __name__ == "__main__":
+    print(merge_sort([42, 12, 3, 1, 5]))