［AtCoder］ABC-317｜B - MissingNo.

設問ページ

• 🔗ABC-317 B - MissingNo.

提出結果

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

def getIntList():
    return list(map(int, input().split()))

def main():
    n = getInt()
    a = getIntList()
    a.sort()

    for i in range(n - 1):
        if a[i + 1] - a[i] == 1:
            continue
        print(a[i] + 1)
        break

if __name__ == "__main__":
    main()