Day 1: use set for faster lookup

day-01/02-recurring-freq.py

@@ -7,9 +7,9 @@ with open('input.txt', 'r') as f:
 in_list = [x.strip() for x in in_list]
 
 in_list = [int(x) for x in in_list]
-print(in_list)
+# print(in_list)
 
-freq = []
+freq = set()
 
 res = 0
 i = 0
@@ -18,9 +18,10 @@ while True:
         i = 0
     res += in_list[i]
 
-    freq.append(res)
-    if len(freq) != len(set(freq)):
+    if res in freq:
         break
+    
+    freq.add(res)
     i += 1
 
 print(res)