11 lines
271 B
Python
11 lines
271 B
Python
if __name__ == "__main__":
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N, K = map(int, input().split())
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L = list(map(int, input().split()))
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M = []
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for i in range(N):
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if L[i] == 1:
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M.append(i)
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print(min((M[i + K - 1] - M[i] + 1 for i in range(len(M) - K + 1)), default=-1))
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