哥尼斯堡的“七桥问题”（25 分） 哥尼斯堡是位于普累格河上的一座城市，它包含两个岛屿及连接它们的七座桥，如下图所示。 可否走过这样的七座桥，而且每桥只走过一次？瑞士数学家欧拉(Leonhard Euler，1707—1783)最终解决了这个问题，并由此创立了拓扑学。 这个问题如今可以描述为判断欧拉回路是否存在的问题。欧拉回路是指不令笔离开纸面，可画过图中每条边仅一次，且可以回到起点的一条
Ant Trip Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 3660 Accepted Submission(s): 1455 Problem Description Ant Country consist of N town
这道模版用到了链式向前星表示法： struct node { int v,next; }edge[1001]; void add(int x,int y) { edge[++cnt].next=heads[x]; edge[cnt].v = y; heads[x]=cnt; return ; }
L2-013. 红色警报 时间限制 400 ms 内存限制 65536 kB 代码长度限制 8000 B 判题程序 Standard 作者 陈越 战争中保持各个城市间的连通性非常重要。本题要求你编写一个报警程序，当失去一个城市导致国家被分裂为多个无法连通的区域时，就发出红色警报。注意：若该国本来就不完全连通，是分裂的k个区域，而失去一个城市并不改变其他城市之间的连通性，则不要
B. Cthulhu time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output ...Once upon a time a man came to the sea. The sea was stormy and dark.
链接：https://www.nowcoder.com/acm/contest/96/E来源：牛客网 小木乃伊到我家 时间限制：C/C++ 1秒，其他语言2秒 空间限制：C/C++ 32768K，其他语言65536K 64bit IO Format: %lld 题目描述 AA的欧尼酱qwb是个考古学家，有一天qwb发现了只白白圆圆小小的木乃伊，它是个爱哭鬼却很努
Deleting Edges Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 567 Accepted Submission(s): 210 Problem Description Little Q is crazy abou
Travel The country frog lives in has nn towns which are conveniently numbered by 1,2,…,n1,2,…,n. Among n(n−1)2n(n−1)2 pairs of towns, mm of them are connected by bidirectional highway, which needs aa
Vertex Cover frog has a graph with nn vertices v(1),v(2),…,v(n)v(1),v(2),…,v(n) and mm edges (v(a1),v(b1)),(v(a2),v(b2)),…,(v(am),v(bm))(v(a1),v(b1)),(v(a2),v(b2)),…,(v(am),v(bm)). She would like to c
一、 点的定义： int n,tot;//n为二维平面上点的个数，tot为凸包上点的个数 struct node { int x,y; }a[N],p[N];//p[]用来储存凸包 二、距离公式： double dis(node a,node b) { return (a.x-b.x)*(a.x-b.x)+(a.y-b.y)*(a.y-b.y);
垃圾箱分布 时间限制 200 ms 内存限制 65536 kB 代码长度限制 8000 B 判题程序 Standard 作者 陈越 大家倒垃圾的时候，都希望垃圾箱距离自己比较近，但是谁都不愿意守着垃圾箱住。所以垃圾箱的位置必须选在到所有居民点的最短距离最长的地方，同时还要保证每个居民点都在距离它一个不太远的范围内。 现给定一个居民区的地图，以及若干垃圾箱的候选地点，请你推荐最
先引用网上的关于差分约束的解释： 一、引例 1、一类不等式组的解 给定n个变量和m个不等式，每个不等式形如 x[i] – x[j] <= a[k] (0 <= i, j < n, 0 <= k < m， a[k]已知)，求 x[n-1] – x[0] 的最大值。例如当n = 4，m = 5，不等式组如图一-1-1所示的情况，求x3 – x0的最大值。 图一-1-1
King Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 2216 Accepted Submission(s): 999 Once, in one kingdom, there was a queen and that quee
spfa的算法思想（动态逼近法）： 设立一个先进先出的队列q用来保存待优化的结点，优化时每次取出队首结点u，并且用u点当前的最短路径估计值对离开u点所指向的结点v进行松弛操作，如果v点的最短路径估计值有所调整，且v点不在当前的队列中，就将v点放入队尾。这样不断从队列中取出结点来进行松弛操作，直至队列空为止。 松弛操作的原理是著名的定理：“三角形两边之和大于第三边”，在信息学中我们叫它
HDU 1863 畅通工程
Time limit2000 ms Memory limit262144 kB Breaking Good is a new video game which a lot of gamers want to have. There is a certain level in the game that is really difficult even for experienced gamer
#include<iostream> #include<math.h> #include<memory.h> using namespace std; #define inf 0x3f3f3f3f int n,m;//n现有城镇数目，m道路数目 int map[300][300]; int dis[300],vis[300];
Agri-Net Time Limit : 2000/1000ms (Java/Other) Memory Limit : 20000/10000K (Java/Other) Total Submission(s) : 1 Accepted Submission(s) : 1 Problem Description Farmer John has been elected mayor of
Out of Hay Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 18472 Accepted: 7318 Description The cows have run out of hay, a horrible event that must be remedied immediately. Bessi
Six Degrees of Cowvin Bacon Time Limit : 2000/1000ms (Java/Other) Memory Limit : 131072/65536K (Java/Other) Total Submission(s) : 2 Accepted Submission(s) : 1 Problem Description The cows have bee
Layout Time Limit : 2000/1000ms (Java/Other) Memory Limit : 131072/65536K (Java/Other) Total Submission(s) : 4 Accepted Submission(s) : 1 Problem Description Like everyone else, cows like to stand
Wormholes Time Limit : 4000/2000ms (Java/Other) Memory Limit : 131072/65536K (Java/Other) Total Submission(s) : 6 Accepted Submission(s) : 2 Problem Description While exploring his many farms, Fa
Silver Cow Party Time Limit : 4000/2000ms (Java/Other) Memory Limit : 131072/65536K (Java/Other) Total Submission(s) : 1 Accepted Submission(s) : 1 Problem Description One cow from each of N farm
Play on Words Time Limit: 10000/5000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 9053 Accepted Submission(s): 3125 Problem Description Some of the secret door
The Unique MST 时间限制: 10 Sec 内存限制: 128 MB提交: 25 解决: 10[提交][状态][讨论版] 题目描述 Given a connected undirected graph, tell if its minimum spanning tree is unique. Definition 1 (Spanning Tree): Consider a c
文化之旅(dijstra)
欧拉回路 Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 16763 Accepted Submission(s): 6476 Problem Description 欧拉回路是指不令笔离开纸面，可画过图中每条边仅一次，且可以回到起
POJ 1182 食物链(并查集的使用）
Conscription Time Limit : 2000/1000ms (Java/Other) Memory Limit : 131072/65536K (Java/Other) Problem Description Windy has a country, and he wants to build an army to protect his country. He has
过山车 Time Limit : 1000/1000ms (Java/Other) Memory Limit : 32768/32768K (Java/Other) Font: Times New Roman | Verdana | Georgia Font Size: ← → Problem Description RPG girls今天和大家一起去游乐场玩，终于可以坐上梦寐以求的过山车
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