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poj 2299 一个乱序序列的 逆序数 = 在只允许相邻两个元素交换的条件下,得到有序序列的交换次数 归并排序的思想：先递归把序列拆分，然后合并 合并函数： 需要注意的是t=t+mid-i+1，t即是所求的逆序数。 比如序列91054，在第二次合并190时，0比1小，那么0肯定也会比1后面的9要小 阅读全文
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例题一 poj 1753 Flip Game 题目的大概意思是每一次翻动一个格子，他周围的也会跟着进行翻动，看翻动几次可以使所有的格子都变成一种颜色。 4*4的一共16个格子，如果16个格子都被翻转了还是没有达到要求则不可能达成 用DFS深搜来枚举，每次翻动一个格子判断一次是否达成，若满足未达成并且 阅读全文
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好久都没有做题了，从长沙回来之后一直就是看看QT，感觉自己真的要蠢死了><不开心不开心 题目大概意思就是从一个图里面去掉一个点，看看剩下多少个孤立点。 自己想了好大一会儿没有思路，看到网上一个代码，真是惊叹好神奇...>< 用遍历的方式，如DFS，将去掉的点设为1，然后遍历一次看看剩下多少个没有被遍 阅读全文
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To evaluate the performance of our first year CS majored students, we consider their grades of three courses only: C - C Programming Language, M - Mat 阅读全文
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Given a pair of positive integers, for example, 6 and 110, can this equation 6 = 110 be true? The answer is "yes", if 6 is a decimal number and 110 is 阅读全文
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Given a sequence of K integers { N1, N2, ..., NK }. A continuous subsequence is defined to be { Ni, Ni+1, ..., Nj } where 1 <= i <= j <= K. The Maximu 阅读全文
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At the beginning of every day, the first person who signs in the computer room will unlock the door, and the last one who signs out will lock the door 阅读全文
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Given a non-negative integer N, your task is to compute the sum of all the digits of N, and output every digit of the sum in English. Input Specificat 阅读全文
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1004. Counting Leaves (30) A family hierarchy is usually presented by a pedigree tree. Your job is to count those family members who have no child. In 阅读全文
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As an emergency rescue team leader of a city, you are given a special map of your country. The map shows several scattered cities connected by some ro 阅读全文