POJ 2387 Til the Cows Come Home 【POJ】2387 Til the Cows Come Home 题目链接：poj-2387 Dscription Bessie is out in the field and wants to get back to the barn to get as much sleep as possible before Farmer John wakes her for the morning m 2019-11-20 算法 POJ Dijkstra 图论 优先队列 堆
POJ 3279 FLiptile 【POJ】 3279 Fliptile 题目链接：poj-3279 DescriptionFarmer John knows that an intellectually satisfied cow is a happy cow who will give more milk. He has arranged a brainy activity for cows in which they m 2019-11-14 算法 DFS POJ 状态压缩
POJ 3126 Prime Path 【POJ】 3126 Prime Path 题目链接：poj-3126 DescriptionThe ministers of the cabinet were quite upset by the message from the Chief of Security stating that they would all have to change the four-digit room n 2019-11-07 算法 POJ BFS 素数筛 欧拉筛 埃氏筛 数论
素数 埃氏筛 欧拉筛(线性筛) 【素数筛】 埃氏筛 欧拉筛（线性筛） 素数筛是一种用来筛选自然数n以内全部素数的算法。 埃氏筛 (Sieve of Eratosthenes) 埃氏筛的原理很容易理解，任意一个合数都可以表示成一个自然数i和一个素数的乘积，因此，如上图，筛出素数的倍数，剩下的就是素数。 代码//在primes中值为true的是合数 bool primes[MAXN] = {1, 1, 2019-11-06 算法 素数筛 欧拉筛 埃氏筛 数论
POJ 1426 Find The Multiple 【POJ】1426 Find The Multiple (BFS/DFS) 题目链接：poj-1426 Description Given a positive integer n, write a program to find out a nonzero multiple m of n whose decimal representation contains only the digits 2019-11-04 算法 DFS POJ BFS
