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全部文章（共62篇）

博主简介

大一在读，acmer菜鸟一只，虽然菜，但我会在acm的路上一直走下去。

2019-06-05

0 519

Codeforces Round #563 (Div. 2) C - Ehab and a Special Coloring Problem

You're given an integer n. For every integer i from 2 to n, assign a positive integer ai such that the following conditions hold: For any pair of ...

2019-06-04

0 633

Codeforces Round #563 (Div. 2) B Ehab Is an Odd Person

You're given an array a of length n . You can perform the following operation on it as many times as you want: Pick two integers i and j (1≤i,j≤...

2019-06-04

0 617

Codeforces Round #563 (Div. 2) A Ehab Fails to Be Thanos

You're given an array a of length 2n. Is it possible to reorder it in such way so that the sum of the first n elements isn't equal to the sum of the ...

2019-06-04

0 810

牛牛的幂运算

题目描述牛牛在做一道数学题，他发现自己不怎么会做，请你帮帮他求有多少a,b,c,d满足a^b = c^d， 1<=a,b,c,d<=n, 模 10^9+7 输入描述: 输入一个整数n (1 ≤ n ≤ 109) 输出描述: 输出一个整数示例1 输...

2019-05-29

0 551

EOJ Monthly 2019.5 (based on May Selection) B. 幂运算

B. 幂运算单点时限: 1.0 sec 内存限制: 256 MB QQ小方以前不会幂的运算，现在他会了，所以他急切的想教会你。对于形如 xa 的计算，可以归结到乘法运算 xa=∏a1x 。单单讲给你听肯定是不够的，为了表现自己，QQ小方现在要考考你。 QQ小方现在想知道有多少四元组...

2019-05-29

0 614

Codeforces Round #562 (Div. 2) B - Pairs

B. Pairs time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Toad Ivan has m pairs...

2019-05-27

0 521

Codeforces Round #562 (Div. 2) A - Circle Metro

A. Circle Metro time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output The circle line ...

2019-05-27

0 713

2019CCPC湖南全国邀请赛（广东省赛、江苏省赛）重现赛 K.SSY and JLBD

#include<cstdio> #include<cstring> using namespace std; char str[14][14]; int main(){ int i; while(scanf("%s",str[0])!=E...

2019-05-20

0 573

2019CCPC湖南全国邀请赛（广东省赛、江苏省赛） C.Chika and Friendly Pairs

Problem Description Chika gives you an integer sequence a1,a2,…,an and m tasks. For each task, you need to answer the number of "friendly pairs&...

2019-05-20

0 658