[Codility] PermCheck

77%

antiSum 뭐야..

def solution(A):
    return int(sum(A) == len(A)*(len(A)+1)//2)

100%

def solution(A):
    B = [i for i in range(1,len(A)+1)]
    diff = set(B)-set(A)
    return int(len(diff) == 0)

others

def solution(A):
    N = len(A)

    xorSum = 0
    for i in range(1, N+1):
        xorSum ^= i ^ A[i-1]

    if xorSum == 0:
        return 1
    else:
        return 0

def solution(A):
    if max(A) != len(A) or len(set(A)) != len(A):
        return 0
    return 1