首先可以前缀和 ans = solve(R) - solve(L-1) 对于solve(x) 1-x当中符合条件的数 分两种情况 3,5,7,9次方的数,注意这地方不能含有平方次 平方数 #include <algorithm> #include <cmath> #include <cstdio> #include <iostream> #include <vector> std::vector<long long> oddNumbe…

题意 给定一棵以 \(1\) 号点为根的树.若满足以下条件,则认为节点 \(p\) 处有一个 \(k\) 叉高度为 \(m\) 的堆: 若 \(m = 1\) ,则 \(p\) 本身就是一个 \(k\) 叉高度为 \(1\) 的堆. 若 \(m > 1\) ,则 \(p\) 需要有至少 \(k\) 个儿子满足在儿子处有一个 \(k\) 叉高度为 \(m − 1\) 的堆. 令 \(dp[p][k]\) 表示在 \(p\) 点 \(k\) 叉堆的最大高度,令 \(g[p][k]\) 为 \(p\)…

Let's call a string adorable if its letters can be realigned in such a way that they form two consequent groups of equal symbols (note that different groups must contain different symbols). For example, ababa is adorable (you can transform it to aaab…

After waking up at hh:mm, Andrew realised that he had forgotten to feed his only cat for yet another time (guess why there's only one cat). The cat's current hunger level is H points, moreover each minute without food increases his hunger by D points…

Codeforces Round #486 (Div. 3) D. Points and Powers of Two 题目连接: http://codeforces.com/group/T0ITBvoeEx/contest/988/problem/D Description There are n distinct points on a coordinate line, the coordinate of i-th point equals to xi. Choose a subset of…

Codeforces Round #529(Div.3)个人题解 前言: 闲来无事补了前天的cf,想着最近刷题有点点怠惰,就直接一场cf一场cf的刷算了,以后的题解也都会以每场的形式写出来 A. Repeating Cipher 传送门 题意:第一个字母写一次,第二个字母写两次,依次递推,求原字符串是什么 题解:1.2.3.4,非常明显的d=1的等差数列,所以预处理一个等差数列直接取等差数列的每一项即可 代码: #include<bits/stdc++.h> using namespace s…

Codeforces Round #366 (Div. 2) A I hate that I love that I hate it水题 #I hate that I love that I hate it n = int(raw_input()) s = "" a = ["I hate that ","I love that ", "I hate it","I love it"] for i in ran…

Codeforces Round #354 (Div. 2) Problems     # Name     A Nicholas and Permutation standard input/output 1 s, 256 MB    x3384 B Pyramid of Glasses standard input/output 1 s, 256 MB    x1462 C Vasya and String standard input/output 1 s, 256 MB    x1393…

直达–>Codeforces Round #368 (Div. 2) A Brain’s Photos 给你一个NxM的矩阵,一个字母代表一种颜色,如果有”C”,”M”,”Y”三种中任意一种就输出”#Color”,如果只有”G”,”B”,”W”就输出”#Black&White”. #include <cstdio> #include <cstring> using namespace std; const int maxn = 200; const int INF =…

 cf之路,1,Codeforces Round #345 (Div. 2) ps:昨天第一次参加cf比赛,比赛之前为了熟悉下cf比赛题目的难度.所以做了round#345连试试水的深浅.....       其实这个应该是昨天就写完的,不过没时间了,就留到了今天.. 地址:http://codeforces.com/contest/651/problem/A A. Joysticks time limit per test 1 second memory limit per test 256…