Pair: normal and paranormal 题目链接: http://acm.hust.edu.cn/vjudge/contest/126546#problem/H Description If you find yourself in Nevada at an abandoned nuclear range during Halloween time, you'll become a witness of an unusual show. Here Ghostbusters hol…

每次取相邻的两个可以射击的从序列中删除,重复n次. 可以看作括号序列的匹配. #include<cstdio> #include<vector> using namespace std; struct data { char c; int p; data(){} data(const char &cc,const int &pp) { c=cc; p=pp; } }; vector<data>a; typedef vector<data>::…

题目链接:http://codeforces.com/gym/100507/attachments ---------------------------------------------------------------------------- 刚看这题的时候感觉是区间$DP$ 然而复杂度一直停留在$O(n^3)$优化不下来 后来又瞎试了一些贪心 都在较大的数据上挂掉了 反复琢磨着大写字母和相应小写字母匹配 便想到了以前做过的括号匹配 只不过此题大写字母和小写字母的左右关系是不限制的 因…

比赛题目链接 题意:有n个人每人拿着一把枪想要杀死n个怪兽,大写字母代表人,小写字母代表怪兽.A只能杀死a,B只能杀死b,如题目中的图所示,枪的弹道不能交叉.人和怪兽的编号分别是1到n,问是否存在能全部杀死的情况,如果存在则输出编号1到n的每个人杀死的怪兽的编号,如果不能输出"Impossible". 题解:贪心,用递归实现,判断相邻的是否能构成一对,优先构成相邻的,如果不能就递归到前面看是否能构成一对即可. #include<cstdio> #include<cst…

2019. Pair: normal and paranormal Time limit: 1.0 secondMemory limit: 64 MB If you find yourself in Nevada at an abandoned nuclear range during Halloween time, you’ll become a witness of an unusual show. Here Ghostbusters hold annual tests for new ve…

题意:在一个半圆内,有2*n个点,其中有大写字母和小写字母.其中你需要连接大写字母到小写字母,其中需要保证这些连接的线段之间没有相交. 如果能够实现,将大写字母对应的小写字母的序号按序输出. 析:我把它看成一个括号序列,然后用栈解决即可. 代码如下: #pragma comment(linker, "/STACK:1024000000,1024000000") #include <cstdio> #include <string> #include <cs…

If you find yourself in Nevada at an abandoned nuclear range during Halloween time, you’ll become a witness of an unusual show. Here Ghostbusters hold annual tests for new versions of their proton packs. There are n Ghostbusters and n portable traps…

题目链接:http://codeforces.com/group/aUVPeyEnI2/contest/229669 时间限制:1s 空间限制:64MB 题目大意:给定一个长度为2n,由n个大写字母和n小写字母组成的字符串,将对应的字母两两连接,且不相交,按顺序输出没个大写字母对应的小写字母的位置,如果不存在则输出"Impossible" 样例: 解法: 手动建立结构体,维护一个栈 代码: #include<bits/stdc++.h> using namespace st…

Intervals 题目连接: http://codeforces.com/gym/100231/attachments Description 给你n个区间,告诉你每个区间内都有ci个数 然后你需要找一个最小的点集,使得满足这n个区间的条件 Input n 然后li,ri,ci Output 输出最小点集大小 Sample Input 5 3 7 3 8 10 3 6 8 1 1 3 1 10 11 1 Sample Output 6 Hint 题意 题解: 线段树+二分+贪心 首先我们贪心一…

F. Doomsday Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100187/problem/F Description Doomsday comes in t units of time. In anticipation of such a significant event n people prepared m vaults in which, as they think, it will…