B. The Best Gift time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Emily's birthday is next week and Jack has decided to buy a present for her. He knows she loves books so he goes to the loc…
题目链接:http://codeforces.com/problemset/problem/652/D 大意:给若干个线段,保证线段端点不重合,问每个线段内部包含了多少个线段. 方法是对所有线段的端点值离散化,按照左端点从大到小排序,顺着这个顺序处理所有线段,那么满足在它内部的线段一定是之前已经扫到过的.用树状数组判断有多少是在右端点范围内. #include <iostream> #include <vector> #include <algorithm> #incl…
题目链接:http://codeforces.com/problemset/problem/609/E 大致就是有一棵树,对于每一条边,询问包含这条边,最小的一个生成树的权值. 做法就是先求一次最小生成树,标记最小生成树上的边,对于这些边,直接就是原始最小生成树.否则必然可以在去掉u到v路径上最长边,再加上边u->v,这一定是包含此边最小的生成树. 查询最长边,可以用树链剖分,也可以树上倍增. #include <iostream> #include <vector> #in…
F. Frogs and mosquitoes time limit per test 2 seconds memory limit per test 512 megabytes input standard input output standard output There are n frogs sitting on the coordinate axis Ox. For each frog two values xi, ti are known — the position and th…
E. Minimum spanning tree for each edge time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Connected undirected weighted graph without self-loops and multiple edges is given. Graph contains n …
D. Gadgets for dollars and pounds time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Nura wants to buy k gadgets. She has only s burles for that. She can buy each gadget for dollars or for po…
C. Load Balancing time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output In the school computer room there are n servers which are responsible for processing several computing tasks. You know the…
A. USB Flash Drives time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Sean is trying to save a large file to a USB flash drive. He has n USB flash drives with capacities equal to a1, a2, ...…
因为是unrated于是就叫划水记了,而且本场也就用了1h左右. A.B:划水去了,没做 C:大水题,根据初三课本中圆的知识,可以把角度化成弧长,而这是正多边形,所以又可以化成边数,于是假设读入为a,就是周长的a/180,gcd一下就行了,注意如果a/b这个分数满足a+1=b,那么就要ans*=2 #include<bits/stdc++.h> using namespace std; int main() { int T;scanf("%d",&T); while…
A. Lucky Year time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Apart from having lots of holidays throughout the year, residents of Berland also have whole lucky years. Year is considered lu…