2015 Day 25 Python

2015/day25.py

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+import re
+
+with open('day25-input', 'r') as file:
+	line = file.read().strip()
+r, c = [int(x) for x in re.findall('row (\d+).*column (\d+)', line)[0]]
+print(r, c)
+
+starting_value = 20151125
+
+def get_value(index: int) -> int:
+	value = starting_value
+	for _ in range(1, index):
+		value = (value * 252533) % 33554393
+	return value
+
+def fib(x: int) -> int:
+	value = 1
+	for i in range(1, x):
+		value += i
+	return value
+
+def get_value_rc(row: int, column: int) -> int:
+	stripe_row = row + column - 1
+	stripe_row_idx = fib(stripe_row)
+	return get_value(stripe_row_idx + column - 1)
+
+print(f'Test: value at row 6, column 6 is {get_value_rc(6, 6)}')
+print(f'Part 1: value at row {r}, column {c} is {get_value_rc(r, c)}')