P2913 [USACO08OCT]车轮旋转Wheel Rotation 题目描述 Farmer John has an old-time thresher (wheat harvester) that requires belts to be installed on various gears to turn the parts. The engine drives pulley 1 in a clockwise direction which attaches via a belt to…

P2913 [USACO08OCT]车轮旋转Wheel Rotation 稳妥起见(防止数据出锅),用了bfs 每次的转移可以直接用异或和解决. #include<iostream> #include<cstdio> #include<cstring> #include<queue> #define re register using namespace std; void read(int &x){ ; while(!isdigit(c)) c=g…

传送门 初始状态是 0,如果有 1 的连接,0 就变 1,如果还有 1 的连接,1 就变 0,如果是 0 的连接就不变 所以就是把答案异或上所有连接,不用考虑顺序,反正最终是一样的 #include<iostream> #include<cstdio> #include<algorithm> #include<cstring> #include<cmath> using namespace std; inline int read() { ,f=…

洛谷P2914:https://www.luogu.org/problemnew/show/P2914 哇 这题目在暑假培训的时候考到 当时用Floyed会T掉 看楼下都是用Dijkstra 难道没有人用优雅的SPFA吗? 思路 用前向星构建整个图 注意每一条边都不能超过len(也就是题目中的m) 所以存图的时候注意一下这一点就行了 其他就跟SPFA一样套板子 代码中还有详细注解 注意坑点:数组开大一点 没开大的我RE了2次 代码 #include<iostream> #include<…

P1550 [USACO08OCT]打井Watering Hole 题目背景 John的农场缺水了!!! 题目描述 Farmer John has decided to bring water to his N (1 <= N <= 300) pastures which are conveniently numbered 1..N. He may bring water to a pasture either by building a well in that pasture or con…

题目大意:输入S1,S2,S3,随机生成三个数x,y,z,求x+y+z出现次数最多的数(如果有多个答案输出最小的),其中1<=x<=S1,1<=y<=S2,1<=z<=S3. 数据范围:(2 <= S1 <= 20; 2 <= S2 <= 20; 2 <= S3 <= 40) 由题可知数据范围不大,可以直接暴力,请见代码 /* 浴谷2911 */ #include <iostream> using namespace st…

P2912 [USACO08OCT]牧场散步Pasture Walking 题目描述 The N cows (2 <= N <= 1,000) conveniently numbered 1..N are grazing among the N pastures also conveniently numbered 1..N. Most conveniently of all, cow i is grazing in pasture i. Some pairs of pastures are…

题面 题目背景 John的农场缺水了!!! 题目描述 Farmer John has decided to bring water to his N (1 <= N <= 300) pastures which are conveniently numbered 1..N. He may bring water to a pasture either by building a well in that pasture or connecting the pasture via a pipe…

题目描述 The N cows (2 <= N <= 1,000) conveniently numbered 1..N are grazing among the N pastures also conveniently numbered 1..N. Most conveniently of all, cow i is grazing in pasture i. Some pairs of pastures are connected by one of N-1 bidirectional…

题目描述 The N cows (2 <= N <= 1,000) conveniently numbered 1..N are grazing among the N pastures also conveniently numbered 1..N. Most conveniently of all, cow i is grazing in pasture i. Some pairs of pastures are connected by one of N-1 bidirectional…