07

07/07-2.py

@@ -0,0 +1,44 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+file = "./input.txt"
+#file = "./ex.txt"
+
+from itertools import product
+def evaluate_left_to_right(numbers:list[int], operations:list[str]) -> int:
+    result = numbers[0]
+    for i, op in enumerate(operations):
+        if op == '+':
+            result += numbers[i+1]
+        elif op == '*':
+            result *= numbers[i+1]
+        elif op == '-':
+            result = int(str(result)+str(numbers[i+1]))
+    return result
+def check_combinations(numbers:list[int], target:int) -> bool:
+    operations = ['+', '*', '-']
+    n = len(numbers) - 1
+    for ops in product(operations, repeat=n):
+        if target == evaluate_left_to_right(numbers, ops):
+            return True
+    return False
+
+def parse_str_to_int_list(number_string:str)->list[int]:
+    result = []
+    tmp = number_string.split()
+    for num in tmp:
+        result.append(int(num))
+    return result
+
+if __name__ == "__main__":
+    solution = 0
+    input_file = open(file, "r")
+    for line in input_file:
+        line = line.strip()
+        if line == "":
+            continue
+        line = line.split(":")
+        if check_combinations(parse_str_to_int_list(line[1]), int(line[0])):
+            solution += int(line[0])
+    input_file.close()
+
+    print(f'Solution: {solution}')