Educational Codeforces Round 48 (Rated for Div. 2) C. Vasya And The Mushrooms 题目链接:https://codeforces.com/contest/1016/problem/C 题意: emmm,说不清楚,还是直接看题目吧. 题解: 这个题人行走的方式是有一定的规律的,最后都是直接走到底,然后从另外一行走回来.并且通过画图观察,会发现他走到格子的时间会有一定的规律. 所以就维护几个前缀和就行了,从1到n枚举一下,还要…

Educational Codeforces Round 59 (Rated for Div. 2) D. Compression 题目链接:https://codeforces.com/contest/1107/problem/D 题意: 给出一个n*(n/4)的矩阵,这个矩阵原本是一些01矩阵,但是现在四个四个储存进二进制里面,现在给出的矩阵为0~9以及A~F,表示0~15. 然后问这个矩阵能否压缩为一个(n/x)*(n/x)的矩阵,满足原矩阵中大小为x*x的子矩阵所有数都相等(所有子矩阵构…

题目总链接:https://codeforces.com/contest/1096 A. Find Divisible 题意: 给出l,r,在[l,r]里面找两个数x,y,使得y%x==0,保证有解. 题解: 直接输出l,2*l就好啦,但我还是写了个循环... 代码如下: #include <bits/stdc++.h> using namespace std; typedef long long ll; ; int T; ll l,r; int main(){ cin>>T; w…

A. Deadline 题目链接 题目大意 给你\(n,d\)两个数,问是否存在\(x\)使得\(x+\frac{d}{x+1}\leq n\),其中\(\frac{d}{x+1}\)向上取整. 解题思路 方案一:利用均值不等式公式推导 \(x+\frac{d}{x+1}=x+1+\frac{d}{x+1}-1\geq2\sqrt{d}-1\) 所以 \(\min(x+\frac{x}{d+1})=2\sqrt{d}-1\) 因此去判断\(2\sqrt{d}-1\leq n\)是否成,即\(4\…

Educational Codeforces Round 129 (Rated for Div. 2) A-D A 题目 https://codeforces.com/contest/1681/problem/A 题解 思路 知识点:贪心. 先手的一方拥有大于等于对方最大牌的牌即可获胜,所以考虑取两组牌各自的最大值进行比较. 时间复杂度 \(O(n)\) 空间复杂度 \(O(1)\) 代码 #include <bits/stdc++.h> #define ll long long using…

Problem   Educational Codeforces Round 60 (Rated for Div. 2) - C. Magic Ship Time Limit: 2000 mSec Problem Description Input Output The only line should contain the minimal number of days required for the ship to reach the point (x2,y2)(x2,y2). If it…

Problem   Educational Codeforces Round 60 (Rated for Div. 2) - D. Magic Gems Time Limit: 3000 mSec Problem Description Input The input contains a single line consisting of 2 integers N and M (1≤N≤10^18, 2≤M≤100). Output Print one integer, the total n…

Educational Codeforces Round 43 (Rated for Div. 2) https://codeforces.com/contest/976 A #include<bits/stdc++.h> using namespace std; #define lson l,mid,rt<<1 #define rson mid+1,r,rt<<1|1 #define IT set<ll>::iterator #define sqr(x)…

Educational Codeforces Round 35 (Rated for Div. 2) https://codeforces.com/contest/911 A 模拟 #include<bits/stdc++.h> using namespace std; #define lson l,mid,rt<<1 #define rson mid+1,r,rt<<1|1 #define IT set<ll>::iterator #define sqr(…

Codeforces Educational Codeforces Round 44 (Rated for Div. 2) F. Isomorphic Strings 题目连接: http://codeforces.com/contest/985/problem/F Description You are given a string s of length n consisting of lowercase English letters. For two given strings s an…