Finish 2015.

2015/d25.py

@@ -0,0 +1,19 @@
+import sys
+from lib import str_to_ints
+
+with open("i25.txt", "r") as f:
+    target_row, target_col = str_to_ints(f.read())
+
+x = 20151125
+m = 252533
+d = 33554393
+
+for start_row in range(1, 10000):
+    row, col = start_row, 1
+    while row > 0:
+        if row == target_row and col == target_col:
+            print(x)
+            sys.exit(0)
+        x = (x * m) % d
+        row -= 1
+        col += 1