[Codility] PermCheck

https://app.codility.com/programmers/lessons/4-counting_elements/perm_check/

PermCheck coding task - Learn to Code - Codility

def solution(A):
    A=sorted(A)
    if A[0]!=1:
        return 0
    else:
        for i in range(len(A)-1):
            if A[i]+1!=A[i+1]:
                return 0
            else :
                continue
        return 1