［AtCoder］ABC-375｜A - Seats

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• 🔗ABC-375 A - Seats

提出結果

def getInt():
    return int(input())


def getString():
    return input()


def main():
    N = getInt()
    S = list(getString())

    c = 0
    for i in range(1, N - 1):
        if S[i] != ".":
            continue
        if S[i - 1] == S[i + 1] == "#":
            c += 1
    print(c)


if __name__ == "__main__":
    main()