Codeforces 500D New Year Santa Network（树 + 计数）

【Codeforces 500D New Year Santa Network（树 + 计数）】的更多相关文章

Codeforces 500D New Year Santa Network（树 + 计数）

D. New Year Santa Network time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output New Year is coming in Tree World! In this world, as the name implies, there are n cities connected by n - 1 roads,…

Codeforces 500D. New Year Santa Network

题目大意给你一颗有\(n\)个点的树\(T\),边上有边权. 规定,\(d(i,j)\)表示点i到点j路径上的边权之和. 给你\(q\)次询问,每次询问格式为\(i, j\),表示将按输入顺序排序的第\(i\)条边边权修改为\(j\),并要求回答任取三个不同点\(c_1,c_2,c_3\),所带来的费用\(d(c_1,c_2)+d(c_1,c_3) + d(c_2,c_3)\)的期望原题面 D. New Year Santa Network time limit per test 2 sec…

CF 500D New Year Santa Network tree 期望好题

New Year is coming in Tree World! In this world, as the name implies, there are n cities connected by n - 1 roads, and for any two distinct cities there always exists a path between them. The cities are numbered by integers from 1 to n, and the roads…

Codeforces 588E. A Simple Task (线段树+计数排序思想)

题目链接:http://codeforces.com/contest/558/problem/E 题意:有一串字符串,有两个操作:1操作是将l到r的字符串升序排序,0操作是降序排序. 题解:建立26棵线段树,类似计数排序思想. #include <bits/stdc++.h> using namespace std; ; struct SegTree { ], sum[], l, r; }T[N << ]; ][N]; void pushup(int p, int c) { T[p…

Good Bye 2014 D. New Year Santa Network 图论+期望

D. New Year Santa Network New Year is coming in Tree World! In this world, as the name implies, there are n cities connected by n - 1 roads, and for any two distinct cities there always exists a path between them. The cities are numbered by integer…

cf500D New Year Santa Network

D. New Year Santa Network time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output New Year is coming in Tree World! In this world, as the name implies, there are n cities connected by n - 1 roads,…