add day 7 part 1

day7/code.py

@@ -0,0 +1,38 @@
+import sys
+sys.path.append('../aoclib')
+
+from aoclib import Input
+
+def parse_input(lines: list):
+    equations = list()
+    for l in lines:
+        s = l.split(':')
+        eq = (int(s[0]), [int(x.strip()) for x in s[1].split()])
+        equations.append(eq)    
+    return equations
+
+def solve1(eqs):
+    return sum([e[0] if may_be_true(e[0], e[1]) else 0 for e in eqs]) 
+
+def may_be_true(val: int, lst: list[int]) -> bool:
+    if len(lst) == 1:
+        return lst[0] == val
+
+    if may_be_true(val, [lst[0]+lst[1], *lst[2:]]):
+        return True
+    elif may_be_true(val, [lst[0] * lst[1], *lst[2:]]):
+        return True
+
+    return False
+        
+if __name__ == '__main__':
+    lines = Input('input_test.txt').lines()
+    #lines = Input('input.txt').lines()
+
+    eq = parse_input(lines)
+
+    #part 1
+    print('part 1:', solve1(eq))
+
+    #part 2
+    print('part 2:', '')