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mfgnik

Untitled

Mar 18th, 2023
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Python 0.33 KB | None | 0 0
  1. n = int(input())
  2. s = input()
  3. index = 0
  4. indexes = {}
  5. best_result = None
  6. for index in range(n):
  7.     indexes[s[index]] = index
  8.     if len(indexes) == 4:
  9.         result = max(indexes.values()) - min(indexes.values()) + 1
  10.         if best_result is None or result < best_result:
  11.             best_result = result
  12. print(best_result or -1)
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