1 files changed, 47 insertions, 0 deletions
diff --git a/25/main.py b/25/main.py
new file mode 100755
index 0000000..48ca1f7
--- /dev/null
+++ b/25/main.py
@@ -0,0 +1,47 @@
+#!/usr/bin/python
+
+
+
+def coord_list(until):
+    return result
+
+
+
+def solve_part1(until):
+    # Generate a list of table (row, col) coordinates in the order
+    # that are filled by the algorithm described in the puzzle text.
+    coords = []
+    r = 1
+    c = 0
+    while (r, c) != until:
+        if r == 1:
+            r = c + 1
+            c = 1
+        else:
+            r -= 1
+            c += 1
+        coords.append((r, c))
+
+    code = 20151125 # first code is given
+    for i in range(1, len(coords)):
+        code *=   252533
+        code %= 33554393
+
+    return code
+
+
+
+def main():
+    # Read target coordinate from input text file
+    with open("input.txt", "r") as f:
+        words = f.read().split()
+        row = int(words[-3].rstrip(","))
+        col = int(words[-1].rstrip("."))
+    coord = (row, col)
+
+    print("Part 1 solution:", solve_part1(coord)) # 19980801 for me
+
+
+
+if __name__ == "__main__":
+    main()