/* CodeForces 834C - The Meaningless Game [ 分析,数学 ] | Codeforces Round #426 (Div. 2) 题意: 一对数字 a,b 能不能被表示为 a = x^2 * y , b = x * y^2 分析: 看出题意就差不多可以直接上了 a^2 = x^4 * y^2 , b = x * y^2 x^3 = a^2/b 同理 y^3 = b^2/a 随便验证一下,开三次方这个,要么预打表,要么pow() 完微调 */ #includ…

& -- 位运算之一,有0则0 原题链接 Problem - 1514B - Codeforces 题目 Example input 2 2 2 100000 20 output 4 226732710 题意 t个测试样例,在每个样例中 数组有n个数,数字范围[ 0, 2k - 1] 使得数组每个数&后,结果=0,并且这n个数的和要尽量大 输出有多少个这样的数组 解析 数组每个数&后,结果=0  -->每一位至少一个0 数要尽量大  -->只要这一位可以 != 0, 就…

http://codeforces.com/contest/426/problem/B 对称标题的意思大概是.应当指出的,当线数为奇数时,答案是线路本身的数 #include<iostream> #include<cstdio> #include<cstring> #include<algorithm> #define maxn 1005 using namespace std; char a[maxn][maxn]; int ans; void solve…

A. The Useless Toy time limit per test:1 second memory limit per test:256 megabytes input:standard input output:standard output Walking through the streets of Marshmallow City, Slastyona have spotted some merchants selling a kind of useless toy which…

还是看大佬的题解吧 CFRound#753(Div.3)A-E(后面的今天明天之内补) - 知乎 (zhihu.com) 传送门  Problem - D - Codeforces 题意 n个数字,n个字符, 数字与字符一一对应, 其中字符R红色代表数字可以上升, B蓝色代表可以下降, 问一顿操作下来能否使n个数含有1~n的所有数 题解 当时真的没想到, 蓝色一定在数组前面, 红色一定在数组后面,( 反正就算有方案使得蓝不在前面, 红不在后面,蓝红也是可以交换的). 排序后, 前面的蓝色数字如果…

http://codeforces.com/contest/834 A. The Useless Toy 题意: <,>,^,v这4个箭头符号,每一个都可以通过其他及其本身逆时针或者顺时针旋转得到. 现在给出起始符号和结束符号,以及旋转的次数,判断是逆时针还是顺时针或者是无法判断. 思路: 可以知道4为一个周期,所以就把次数对4取余数,看一个周期之内的操作就可以了,分别模拟顺时针和逆时针的操作,如果都可以到达或者都不可以到达,那么它们就是不可识别的行为,其它就可以判断顺时针或者逆时针了. 代码…

A. The Useless Toy 题目链接:http://codeforces.com/contest/834/problem/A 思路: 水题 实现代码: #include<bits/stdc++.h> #include<iostream> #include<cstdio> #include<string> #include<cstring> #include<cmath> #include<algorithm> #…

Adieu l'ami. Koyomi is helping Oshino, an acquaintance of his, to take care of an open space around the abandoned Eikou Cram School building, Oshino's makeshift residence. The space is represented by a rectangular grid of n × m cells, arranged into n…

— This is not playing but duty as allies of justice, Nii-chan! — Not allies but justice itself, Onii-chan! With hands joined, go everywhere at a speed faster than our thoughts! This time, the Fire Sisters — Karen and Tsukihi — is heading for somewher…

Even if the world is full of counterfeits, I still regard it as wonderful. Pile up herbs and incense, and arise again from the flames and ashes of its predecessor — as is known to many, the phoenix does it like this. The phoenix has a rather long lif…