题目戳 题目描述 Bessie is playing hide and seek (a game in which a number of players hide and a single player (the seeker) attempts to find them after which various penalties and rewards are assessed; much fun usually ensues). She is trying to figure out in…

OJ题号:洛谷2951 思路:Dijkstra+堆优化.注意是无向图,所以加边时要正反各加一遍. #include<cstdio> #include<vector> #include<ext/pb_ds/priority_queue.hpp> #define dis first #define to second ,inf=0x7fffffff; typedef std::pair<int,int> Edge; int n,m,d[N]; std::vect…

典型的最短路,而且只要再加一点点操作,就能得到答案 所以可以直接套模板 具体看程序:: #include<cstdio> #include<queue>//队列专属头文件 #include<algorithm> using namespace std; ; int a[N]; int n,m,l,sum,ans; int d1[N],t[N],head1[N],next1[N],w1[N],adj1[N],k1; bool f1[N]; queue<int>…

P2951 [USACO09OPEN]捉迷藏Hide and Seek 题目描述 Bessie is playing hide and seek (a game in which a number of players hide and a single player (the seeker) attempts to find them after which various penalties and rewards are assessed; much fun usually ensues)…

洛谷 2953 [USACO09OPEN]牛的数字游戏Cow Digit Game 题目描述 Bessie is playing a number game against Farmer John, and she wants you to help her achieve victory. Game i starts with an integer N_i (1 <= N_i <= 1,000,000). Bessie goes first, and then the two players…

意识到一点:在进行点分治时,每一个点都会作为某一级重心出现,且任意一点只作为重心恰好一次.因此原树上任意一个节点都会出现在点分树上,且是恰好一次 https://www.cnblogs.com/zzqsblog/p/6393023.html 对比http://www.cnblogs.com/hehe54321/p/8570320.html的普通点分程序,"到分治树上这个点父亲的距离"相当于solve(u)时各个cal函数计算出的值对ans的总贡献,只不过改成了动态维护这个值. 普通点分…

P2949 [USACO09OPEN]工作调度Work Scheduling 题目描述 Farmer John has so very many jobs to do! In order to run the farm efficiently, he must make money on the jobs he does, each one of which takes just one time unit. His work day starts at time 0 and has 1,000…

P2056 [ZJOI2007]捉迷藏 题目描述 Jiajia和Wind是一对恩爱的夫妻,并且他们有很多孩子.某天,Jiajia.Wind和孩子们决定在家里玩捉迷藏游戏.他们的家很大且构造很奇特,由\(N\)个屋子和\(N-1\)条双向走廊组成,这\(N-1\)条走廊的分布使得任意两个屋子都互相可达. 游戏是这样进行的,孩子们负责躲藏,Jiajia负责找,而Wind负责操纵这\(N\)个屋子的灯.在起初的时候,所有的灯都没有被打开.每一次,孩子们只会躲藏在没有开灯的房间中,但是为了增加刺激性,孩…

动态点分治入 门 题? 题目描述 Jiajia和Wind是一对恩爱的夫妻,并且他们有很多孩子.某天,Jiajia.Wind和孩子们决定在家里玩捉迷藏游戏.他们的家很大且构造很奇特,由 \(N\) 个屋子和 \(N-1\) 条双向走廊组成,这 \(N-1\) 条走廊的分布使得任意两个屋子都互相可达. 游戏是这样进行的,孩子们负责躲藏,Jiajia负责找,而Wind负责操纵这 \(N\) 个屋子的灯.在起初的时候,所有的灯都没有被打开.每一次,孩子们只会躲藏在没有开灯的房间中,但是为了增加刺激性,孩…

P2952 [USACO09OPEN]牛线Cow Line 题目描述 Farmer John's N cows (conveniently numbered 1..N) are forming a line. The line begins with no cows and then, as time progresses, one by one, the cows join the line on the left or right side. Every once in a while, s…