题目链接:https://atcoder.jp/contests/abc126/tasks/abc126_f 题目大意 给定两个整数 M 和 K ,用小于 2M 的的所有自然数,每个两个,用这些数排成一个长度为 2M+1 的序列,使得序列满足以下条件: 每个自然数只能用 2 次. 设序列为 a,$\forall_{i < j}\ 满足a[i] == a[j]$有 a[i] xor a[i + 1] xor……xor a[j] == K. 问这个序列是否存在,存在则输出任意一个,不存在输出 -1.…

鉴于Codeforces和atcoder上有很多神题,即使发呆了一整节数学课也是肝不出来,所以就记录一下. AGC033B LRUD Game 只要横坐标或者纵坐标超出范围就可以,所以我们只用看其中一维就可以了. 我们又知道,如果先手想要让它从左边出去,那么先手就会一直Left,后手就会一直Right. 所以枚举四种情况(L,R,U,D)就可以了. AGC033C Removing Coins 首先我们考虑链的情况,如果选的是端点,那么有一个点没有硬币,如果选的不是端点,那么有两个点没有硬币.所…

突然6道题.有点慌.比赛写了五个.罚时爆炸.最后一个时间不太够+没敢写就放弃了. 两道题奇奇怪怪的WJ和20/20.今天的评测机是怎么了. A Changing a Character #include <bits/stdc++.h> using namespace std; inline int read() { , f = ; char ch = getchar(); ; ch = getchar(); } + ch - ; ch = getchar(); } return x * f;…

个人收藏了很多香港大学.香港科技大学以及香港中文大学里专门搞图像研究一些博士的个人网站,一般会不定期的浏览他们的作品,最近在看杨庆雄的网点时,发现他又写了一篇双边滤波的文章,并且配有源代码,于是下载下来研读了一番,这里仅仅对一些过程做简单的记录,以防时间久了忘记. 关于杨庆雄的相关文章可见:Hardware-Efficient Bilateral Filtering for Stereo Matching以及一篇  Recursive Bilateral Filtering,都配有相关的源代码.…

题目描述: '?' Matches any single character. '*' Matches any sequence of characters (including the empty sequence). The matching should cover the entire input string (not partial). The function prototype should be: bool isMatch(const char *s, const char *…

spring 配置文件报错报错信息:cvc-complex-type.2.4.c: The matching wildcard is strict, but no declaration can be found for element 'mvc:annotation-driven'.    spring-web.xml    /soaweb/src/main/resources    line 14    XML Problem解决办法:schemal中增加tx支持<?xml version=…

Given a non-empty array of numbers, a0, a1, a2, … , an-1, where 0 ≤ ai < 231. Find the maximum result of ai XOR aj, where 0 ≤ i, j < n. Could you do this in O(n) runtime? Example: Input: [3, 10, 5, 25, 2, 8] Output: 28 Explanation: The maximum resul…

Implement wildcard pattern matching with support for '?' and '*'. '?' Matches any single character. '*' Matches any sequence of characters (including the empty sequence). The matching should cover the entire input string (not partial). The function p…

Implement regular expression matching with support for '.' and '*'. '.' Matches any single character. '*' Matches zero or more of the preceding element. The matching should cover the entire input string (not partial). The function prototype should be…

The basic functional cornerstones of Scala: immutable data types, passing of functions as parameters and pattern matching. 1. Basic Pattern Matching In Scala, your cases can include types, wildcards, sequences, regular expressions, and so forth. scal…