POJ 2296 Map Labeler 题目链接 题意: 坐标轴上有N个点.要在每一个点上贴一个正方形,这个正方形的横竖边分别和x,y轴平行,而且要使得点要么在正方形的上面那条边的中点,或者在以下那条边的中点.而且随意两个点的正方形都不重叠(能够重边).问正方形最大边长能够多少? 思路:显然的2-sat问题,注意推断两个矩形相交的地方,细节 代码: #include <cstdio> #include <cstring> #include <cstdlib> #inc…

Map Labeler Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 1267   Accepted: 409 Description Map generation is a difficult task in cartography. A vital part of such task is automatic labeling of the cities in a map; where for each city t…

POJ 2296 Map Labeler / ZOJ 2493 Map Labeler / HIT 2369 Map Labeler / UVAlive 2973 Map Labeler(2-sat 二分) Description Map generation is a difficult task in cartography. A vital part of such task is automatic labeling of the cities in a map; where for e…

Description Katu Puzzle is presented as a directed graph G(V, E) with each edge e(a, b) labeled by a boolean operator op (one of AND, OR, XOR) and an integer c (0 ≤ c ≤ 1). One Katu is solvable if one can find each vertex Vi a value Xi (0 ≤ Xi ≤ 1) s…

二分答案 + 2-SAT验证,判断正方形是否相交写起来有点烦,思路还是挺简单的. #include<cstdio> #include<cstring> #include<cmath> #include<stack> #include<queue> #include<algorithm> using namespace std; ; struct Point { double x,y; }p[maxn]; int N; stack<…

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Rotating Scoreboard Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 6420   Accepted: 2550 Description This year, ACM/ICPC World finals will be held in a hall in form of a simple polygon. The coaches and spectators are seated along the ed…

C++ map使用(基于hashtable) 实际上基于hashtable的map有两种一种是hash_map,unordered_map,但是最好使用后者,原因如下[1] 因为标准化的推进,unordered_map原来属于boost分支和std::tr1中,而hash_map属于非标准容器. 另外,使用之后,感觉速度和hash_map差不多,但是支持string做key,也可以使用复杂的对象作为key. 速度上unordered_map>hash_map>map 具体的使用方式可以参考[3…

POJ 2376 Cleaning Shifts(轮班打扫) Time Limit: 1000MS   Memory Limit: 65536K [Description] [题目描述] Farmer John is assigning some of his N (1 <= N <= 25,000) cows to do some cleaning chores around the barn. He always wants to have one cow working on clean…

POJ 3253 Fence Repair(修篱笆) Time Limit: 2000MS   Memory Limit: 65536K [Description] [题目描述] Farmer John wants to repair a small length of the fence around the pasture. He measures the fence and finds that he needs N (1 ≤ N ≤ 20,000) planks of wood, eac…