第四题，我的思路和楼主基本一致，找差值。但是我统计有多少个完美对，是处理一行数据 统计过往中它的相反差值有几个，然后count加上去，本地自测没问题，就是提交后通过为0。大家能帮忙看看嘛 if __name__ == "__main__": n, k = map(int, input().split()) dict = {} count = 0 for i in range(n): lst = list(map(int, input().split())) diff = [] reverse_diff = [] for j in range(1,k): diff.append(lst[j]-lst[0]) reverse_diff.append( -1*( lst[j]-lst[0] ) ) diff = tuple(diff) reverse_diff = tuple(reverse_diff) if(diff not in dict.keys()): dict[diff] = 1 else: dict[diff] += 1 if(reverse_diff in dict.keys()): count += dict[reverse_diff] print(count)