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题意：一段数字，逆置其中两个使其递增DescriptionBeing a programmer, you like arrays a lot. For your birthday, your friends have given you an array a consisting of ndisti... 阅读全文
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题意及题解：判断有存在几个后面的数比前面的小；如果没有则输出0；如果有不止一个，则输出-1；如果恰有一个， 那么就需要判断a[1]和a[n]的大小关系。DescriptionOne day, Twilight Sparkle is interested in how to sort a sequen... 阅读全文
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题意：给n 求最小的x题解：二元一次方程求解，x*x+x*b-n=0 遍历bDescriptionLet's consider equation:x^2 + s(x)·x - n = 0, where x, n are positive integers, s(x) is the function,... 阅读全文
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题意：求平均值，注意精度A number of students are members of a club that travels annually to exotic locations. Their destinations in the past have included Indiana... 阅读全文
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题意：求平均每千米花的时间，注意精度和格式DescriptionA relay is a race for two or more teams of runners. Each member of a team runs one section of the race. Your task is t... 阅读全文
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题意 男女匹配，最多组合数题解 匈牙利算法Problem DescriptionRPG girls今天和大家一起去游乐场玩，终于可以坐上梦寐以求的过山车了。可是，过山车的每一排只有两个座位，而且还有条不成文的规矩，就是每个女生必须找个个男生做partner和她同坐。但是，每个女孩都有各自的想法，举个... 阅读全文
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题解：dpDescriptionAlex doesn't like boredom. That's why whenever he gets bored, he comes up with games. One long winter evening he came up with a game a... 阅读全文
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题意 ：求期望题解 ：找规律，列举几个，然后找到规律。坑点：要简化，不简化数字一大就wa了Sample InputInput6 1Output3.500000000000Input6 3Output4.958333333333Input2 2Output1.750000000000HintConsi... 阅读全文
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题意：Sample Input4 6 4 3 2 2 1 15 3 2 1 1400 12 50 50 50 50 50 50 25 25 25 25 25 250 0 Sample OutputSums of 4:43+12+22+1+1Sums of 5:NONESums of 400:50+5... 阅读全文