USACO19JAN Gold题解

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噩梦的回忆.. 上周日在机房打的模拟赛,结果十分惨烈,就最后一题yy出了正解结果玄学的只拿了80 考试结果:0+0+80=80 订正时对着T3打了2hours结果还是90 订正结果:100+100+90=290 我太弱了QAQ T1 Luogu P5196 [USACO19JAN]Cow Poetry 题目链接思路:dp+神奇的数学推导快速幂一开始还写锅了,受到了ftq大佬的嘲笑 code #include<bits/stdc++.h> using namespace std; const…

[USACO19JAN]Shortcut题解

本题算法:最短路树这是个啥玩意呢,就是对于一个图,构造一棵树,使从源点开始的单源最短路径与原图一模一样.怎么做呢,跑一边Dijkstra,然后对于一个点u,枚举它的边,设当前的边为cur_edge,如果dis[u]+cue_edge的长度=dis[cur_edge的终点],那么显然这条边应该珂以是最短路树上的一条边,然后打一个标记表示cur_edge的终点不能再被加边了,题目要求字典序最小,显然u从1到n枚举珂以解决问题. 建好树以后跑一边DFS,我们知道当前节点u上连边的贡献是\((dis[…

1702: [Usaco2007 Mar]Gold Balanced Lineup 平衡的队列

1702: [Usaco2007 Mar]Gold Balanced Lineup 平衡的队列 Time Limit: 5 Sec Memory Limit: 64 MBSubmit: 510 Solved: 196[Submit][Status][Discuss] Description Farmer John's N cows (1 <= N <= 100,000) share many similarities. In fact, FJ has been able to narrow…

Gold Balanced Lineup POJ - 3274

Description Farmer John's N cows (1 ≤ N ≤ 100,000) share many similarities. In fact, FJ has been able to narrow down the list of features shared by his cows to a list of only K different features (1 ≤ K ≤ 30). For example, cows exhibiting feature #1…

codevs 2602 最短路径问题——良心题解

2602 最短路径问题时间限制: 1 s 空间限制: 32000 KB 题目等级 : 黄金 Gold 题解题目描述 Description 平面上有n个点(n<=100),每个点的坐标均在-10000~10000之间.其中的一些点之间有连线.若有连线,则表示可从一个点到达另一个点,即两点间有通路,通路的距离为两点间的直线距离.现在的任务是找出从一点到另一点之间的最短路径. 输入描述 Input Description 第一行为整数n. 第2行到第n+1行(共n行),每行两个整数x和y,描述了…

LeetCode 1219. Path with Maximum Gold

原题链接在这里:https://leetcode.com/problems/path-with-maximum-gold/ 题目: In a gold mine grid of size m * n, each cell in this mine has an integer representing the amount of gold in that cell, 0 if it is empty. Return the maximum amount of gold you can colle…