2022 - Day 6 part 2

2022/6/6_2.py

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+#!/usr/bin/env python
+# 2022 - Advent Of Code 6 part 2
+
+# file = 'input_example.txt'
+file = 'input.txt'
+
+previous = []
+count = 0
+with open(file, encoding="utf-8") as f:
+    signal = f.readline().strip()
+    for c in signal:
+        count += 1
+        if c in previous:
+            pos = previous.index(c)
+            # print(f'[{count}]{c} already found at {pos}')
+            previous = previous[pos+1:]
+        elif len(previous) == 13:
+            print(f'start of signal found at position {count}')
+            break
+        previous.append(c)