Hackerrank刷题笔记-Algorithm (1)_divisible sum pairs

Problem 5: Plus Minus

strip() - 删除 string 字符串末尾的指定字符（默认为空格）
format - print(format(0.5,”.6f”)) –> 0.500000

Problem 7: Mini-Max Sum

format - print(“{:d} {:d}”.format(MIN,MAX))

Problem 16: Divisible Sum Pairs

def divisibleSumPairs(n, k, ar):
    m=0
    for i in ar:
        ar2=ar.copy()
        for j in ar2.remove(i):
            if (i+j)\%k==0:
                m+=1
    return m
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为什么不对？ 报错信息是：   for j in ar2.remove(i):TypeError: 'NoneType' object is not iterable
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ar2.remove(i) 这个操作的返回值是None

def divisibleSumPairs(n, k, ar):
    count = 0
    for i in range(n-1):
        for j in range(i+1,n):
            if 0
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