Cup Trick 平衡树维护一下位置. #include<bits/stdc++.h> #include <bits/extc++.h> #define LL long long #define fi first #define se second #define mk make_pair #define PLL pair<LL, LL> #define PLI pair<LL, int> #define PII pair<int, int>…

codeforces 420D Cup Trick 题意 题解 官方做法需要用到线段树+平衡树(? 如果数据小的话似乎可以用莫队).然后代码好长好长.我补了一个只要用到树状数组的做法. 代码 #include<bits/stdc++.h> using namespace std; #define fi first #define se second #define mp make_pair #define pb push_back #define rep(i, a, b) for(int i=…

这题做得比较复杂..应该有更好的做法 题目大意: 有一个括号序列,可以对其进行两种操作: ·        向里面加一个括号,可以在开头,在结尾,在两个括号之间加. ·        对当前括号序列进行循环移动,即把最后一个括号拿到开头来. 上述两种操作可以做任意次,要求添加最少的括号使得原序列变成一个合法括号序列.如果有多种可能,输出字典序最小的那一个."(" < ")". 题解: 首先计算左括号和右括号的数量,可以知道,不妨假设左括号的数量大于右括号 那么…

题目链接:http://codeforces.com/contest/522/problem/D 题目大意:  给你一个长度为n的序列,然后有m次查询,每次查询输入一个区间[li,lj],对于每一个查询,输出在这个区间内的两个相等的数的最短距离,如果没有相等的则输出-1. 线段树+扫描线,线段树维护的值是区间的最小值,从后往前扫,然后每次要做的事有两个: 1.判断当前这个位置 i 的数刚刚是不是出现过,假设刚刚出现的位置是 l ,如果出现过,则在线段树中把l这个位置的值更新为 l - i,同时更…

题目链接:http://codeforces.com/problemset/problem/164/A 思路:用vector分别保留原图和发图,然后分别从val值为1的点正向遍历,va值为2的点反向遍历,如果某个点这两种方式都可以遍历到,则输出1,否则输出0. #include <iostream> #include <cstdio> #include <cstring> #include <algorithm> #include <vector>…

题目链接: http://codeforces.com/contest/575/problem/B 题解: 把链u,v拆成u,lca(u,v)和v,lca(u,v)(v,lca(u,v)是倒过来的).这样就只要考虑自下而上的线性结构了,可以用前缀和的思想来做成段更新. 代码: #include<cstdio> #include<vector> #include<cstring> #include<iostream> #include<algorithm…

H. Bots Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/575/problem/H Description Sasha and Ira are two best friends. But they aren’t just friends, they are software engineers and experts in artificial intelligence. They are…

D. Tablecity Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/575/problem/D Description There was a big bank robbery in Tablecity. In order to catch the thief, the President called none other than Albert – Tablecity’s Chief o…

F. Bulbo Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/575/problem/F Description Bananistan is a beautiful banana republic. Beautiful women in beautiful dresses. Beautiful statues of beautiful warlords. Beautiful stars in…

B. Photo to Remember Time Limit: 1 Sec  Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/522/problem/B Description One day n friends met at a party, they hadn't seen each other for a long time and so they decided to make a group photo together…