Problem 3: Threatening Letter [J. Kuipers, 2002] FJ has had a terrible fight with his neighbor and wants to send him a nasty letter, but wants to remain anonymous. As so many before him have done, he plans to cut out printed letters and paste them on…

Problem 1: Cow Calisthenics [Michael Cohen, 2010] Farmer John continues his never-ending quest to keep the cows fit by having them exercise on various cow paths that run through the pastures. These cow paths can be represented as a set of vertices co…

洛谷 P3038 [USACO11DEC]牧草种植Grass Planting 洛谷传送门 JDOJ 2282: USACO 2011 Dec Gold 3.Grass Planting JDOJ传送门 Description Problem 3: Grass Planting [Travis Hance, 2011] Farmer John has N barren pastures (2 <= N <= 100,000) connected by N-1 bidirectional roa…

USACO 2013 DEC SILVER 一.题目概览 中文题目名称 挤奶调度 农场航线 贝西洗牌 英文题目名称 msched vacation shuffle 可执行文件名 msched vacation shuffle 输入文件名 msched.in vacation.in shuffle.in 输出文件名 msched.out vacation.out shuffle.out 每个测试点时限 1秒 1秒 1秒 测试点数目 10 10 10 每个测试点分值 10 10 10 比较方式 全文…

USACO 2014 DEC SILVER 一.题目概览 中文题目名称 回程 马拉松 奶牛慢跑 英文题目名称 piggyback marathon cowjog 可执行文件名 piggyback marathon cowjog 输入文件名 piggyback.in marathon.in cowjog.in 输出文件名 piggyback.out marathon.out cowjog.out 每个测试点时限 1秒 1秒 1秒 测试点数目 10 10 10 每个测试点分值 10 10 10 比较…

Link: USACO 2017 Dec Gold 传送门 A: 为了保证复杂度明显是从终结点往回退 结果一开始全在想优化建边$dfs$……其实可以不用建边直接$multiset$找可行边跑$bfs$就行了 由于保证每个点只进队列一次.被搜索到一次,因此复杂度为$O(n*log(n))$ #include <bits/stdc++.h> using namespace std; #define X first #define Y second typedef long long ll; typ…

Grass Planting 题意 给出一棵树,树有边权.每次给出节点 (u, v) ,有两种操作:1. 把 u 到 v 路径上所有边的权值加 1.2. 查询 u 到 v 的权值之和. 分析 如果这些值不是在树上,而是在区间上,那么凭借线段树.树状数组可以很轻松的解决,但是在树上则不能直接操作. 树链剖分就是将树上的节点映射到区间上,从而实现区间操作. 学习树链剖分前需要掌握的知识点:线段树.LCA. 参考blog 认真读完这篇 blog ,跟着算法流程走一遍差不多就懂了. code #incl…

NC24083 [USACO 2017 Dec P]Greedy Gift Takers 题目 题目描述 Farmer John's nemesis, Farmer Nhoj, has N cows (\(1≤N≤10^5\)), conveniently numbered 1-N. They have unexpectedly turned up at Farmer John's farm, so the unfailingly polite Farmer John is attempting…

NC24866 [USACO 2009 Dec S]Music Notes 题目 题目描述 FJ is going to teach his cows how to play a song. The song consists of N (1 <= N <= 50,000) notes, and the i-th note lasts for Bi (1 <= Bi <= 10,000) beats (thus no song is longer than 500,000,000…

NC25025 [USACO 2007 Nov G]Sunscreen 题目 题目描述 To avoid unsightly burns while tanning, each of the \(C\) (\(1 ≤ C ≤ 2500\)) cows must cover her hide with sunscreen when they're at the beach. Cow \(i\) has a minimum and maximum \(SPF\) rating (\(1 ≤ minS…