Wisconsin Squares It's spring in Wisconsin and time to move the yearling calves to the yearling pasture and last year's yearlings to the greener pastures of the north 40. Farmer John has five kinds of cows on his farm (abbreviations are shown in pare…

Wisconsin Squares It's spring in Wisconsin and time to move the yearling calves to the yearling pasture and last year's yearlings to the greener pastures of the north 40. Farmer John has five kinds of cows on his farm (abbreviations are shown in pare…

题目链接 Solution 这道题,我是用 \(map\) 做的. 具体实现,我们用一个 \(string\) 类型表示任意一种情况. 可以知道,排列最多只有 \(8!\) 个. 然后就是直接的广搜了.直接用初始串去操作即可. 关于字典序,我们直接按 \(ABC\) 启用操作即可. Code /* Problem: 2730 Time: Day -95 */ #include<bits/stdc++.h> using namespace std; map <string,string&g…

The Primes 题目大意 5*5矩阵,给定左上角 要所有行,列,从左向右看对角线为质数,没有前导零,且这些质数数位和相等(题目给和) 按字典序输出所有方案... 题解 看上去就是个 无脑暴搜 题目条件翻译成处理或剪枝 按照 字典序顺序搜, 末位是奇数 和确定了,那么前4位的和的奇偶性确定了 数值是5位数,可以先生成质数表 和-前n位和 小于 9乘剩余位数 也许先把第一行和第一列定下,然后按照数位和 再分组质数,搜索量会超级小? 17 7的这组数据 超过5s (i7-7700HQ) #inc…

其实日期没有那么近啦……只是我偶尔还点进去造成的,导致我没有每一章刷完的纪念日了 但是全刷完是今天啦 讲真,题很锻炼思维能力,USACO保持着一贯猎奇的题目描述,以及尽量不用高级算法就完成的题解……例如用暴搜加优化代替插头dp 但是第6章!我就说第6章!为什么大赛的实践,几乎全是暴搜!是为了传达给我们不如暴搜吗?! 但是总之是结束了……想了想,从初二暑假刷了两章,然后一年陆陆续续刷完较难的四章…… 唉,一年了啊……下周也该中考了……7月份还得去noi被各大神犇完虐……仅代表辽宁省最低水平…… 一…

Leetcode之广度优先搜索(BFS)专题-279. 完全平方数(Perfect Squares) BFS入门详解:Leetcode之广度优先搜索(BFS)专题-429. N叉树的层序遍历(N-ary Tree Level Order Traversal) 给定正整数 n,找到若干个完全平方数(比如 1, 4, 9, 16, ...)使得它们的和等于 n.你需要让组成和的完全平方数的个数最少. 示例 1: 输入: n = 12 输出: 3 解释: 12 = 4 + 4 + 4. 示例 2: 输…

Instantaneous Transference Time Limit: 5000MS Memory Limit: 65536K Description It was long ago when we played the game Red Alert. There is a magic function for the game objects which is called instantaneous transfer. When an object uses this magic fu…

A Knight's Journey Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 35564 Accepted: 12119 Description Background The knight is getting bored of seeing the same black and white squares again and again and has decided to make a journey around…

Spiral Maximum 题目连接: http://codeforces.com/problemset/problem/173/C Description Let's consider a k × k square, divided into unit squares. Please note that k ≥ 3 and is odd. We'll paint squares starting from the upper left square in the following orde…

E. Chocolate Bar Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/598/problem/E Description You have a rectangular chocolate bar consisting of n × m single squares. You want to eat exactly k squares, so you may need to break…