A. Help Farmer 题目连接: http://www.codeforces.com/contest/142/problem/A Description Once upon a time in the Kingdom of Far Far Away lived Sam the Farmer. Sam had a cow named Dawn and he was deeply attached to her. Sam would spend the whole summer stocki…

A. 解一个方程. 还是厚颜无耻地暴力吧~ #include <iostream> using namespace std; int r1, r2, c1, c2, d1, d2; bool chk(int x1, int x2, int x3, int x4) { int ok = 1; if(x1 == x2 || x1 == x3 || x1 == x4 || x2 == x3 || x2==x4 || x3==x4) ok = 0; if(x1 + x2 != r1) ok = 0;…

题目链接: http://codeforces.com/contest/672/problem/C 题意: 公园里有两个人一个垃圾桶和n个瓶子,现在这两个人需要把所有的瓶子扔进垃圾桶,给出人,垃圾桶,瓶子的坐标,问两个人需要走的最短距离和. 题解: 首先必须要有一个人先去检一个瓶子,然后走到垃圾桶,这个可以枚举,接下来就是考虑另一个人是也捡一个瓶子然后走到垃圾桶(这个可以预处理出最优的,和次优的,因为如果最优的那个刚好被第一个人拿走了,那就拿次优的)还是在原地不动,接下去就是固定的了,求剩下的所…

C. Watering Flowers 题目连接: http://www.codeforces.com/contest/617/problem/C Descriptionww.co A flowerbed has many flowers and two fountains. You can adjust the water pressure and set any values r1(r1 ≥ 0) and r2(r2 ≥ 0), giving the distances at which t…

题目链接:http://codeforces.com/problemset/problem/686/C 给你n和m,问你有多少对(a, b) 满足0<=a <n 且 0 <=b < m 且a的7进制和n-1的7进制位数相同 且b的7进制和m-1的7进制位数相同,还有a和b的7进制上的每位上的数各不相同. 看懂题目,就很简单了,先判断a和b的7进制位数是否超过7,不超过的话就dfs暴力枚举计算就可以了. //#pragma comment(linker, "/STACK:1…

B. Biridian Forest Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/329/problem/B Description You're a mikemon breeder currently in the middle of your journey to become a mikemon master. Your current obstacle is go through t…

D. Valid Sets Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/486/problem/D Description As you know, an undirected connected graph with n nodes and n - 1 edges is called a tree. You are given an integer d and a tree consist…

B. Duff in Love Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/588/problem/B Description Duff is in love with lovely numbers! A positive integer x is called lovely if and only if there is no such positive integer a > 1 such…

B. Once Again... Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/582/problem/B Description You are given an array of positive integers a1, a2, ..., an × T of length n × T. We know that for any i > n it is true that ai = ai -…

C. GCD Table Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/583/problem/C Description The GCD table G of size n × n for an array of positive integers a of length n is defined by formula Let us remind you that the greatest c…

D. Three Logos Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/581/problem/D Description Three companies decided to order a billboard with pictures of their logos. A billboard is a big square board. A logo of each company is…

B. Two Sets Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/468/problem/B Description Little X has n distinct integers: p1, p2, ..., pn. He wants to divide all of them into two sets A and B. The following two conditions must…

题目:http://codeforces.com/problemset/problem/264/B 题意:给你一个递增序列,然后找出满足两点要求的最长子序列 第一点是a[i]>a[i-1] 第二点 gcd(a[i],a[i-1])>1 也就是说两个数不能互质 找出最长的子序列长度 思路:首先想互质问题,如果两个数互质说明两个数之间没有素因子相同,我们想以每个素因子结尾的最大长度是多少 然后比如样例 2 3 4 6 9 第一个数 2      2结尾 1 第二个数 3      3结尾 1 第三…

A. Robbers' watch 题目连接: http://www.codeforces.com/contest/685/problem/A Description Robbers, who attacked the Gerda's cab, are very successful in covering from the kingdom police. To make the goal of catching them even harder, they use their own watc…

A. Recycling Bottles 题目连接: http://www.codeforces.com/contest/671/problem/A Description It was recycling day in Kekoland. To celebrate it Adil and Bera went to Central Perk where they can take bottles from the ground and put them into a recycling bin.…

B. World Tour 题目连接: http://www.codeforces.com/contest/666/problem/B Description A famous sculptor Cicasso goes to a world tour! Well, it is not actually a world-wide. But not everyone should have the opportunity to see works of sculptor, shouldn't he…

C. Removing Columns time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output You are given an n × m rectangular table consisting of lower case English letters. In one operation you can completely r…

A. Combination Lock Time Limit: 1 Sec  Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/540/problem/A Description Scrooge McDuck keeps his most treasured savings in a home safe with a combination lock. Each time he wants to put there the treas…

D. Image Preview 题目连接: http://www.codeforces.com/contest/651/problem/D Description Vasya's telephone contains n photos. Photo number 1 is currently opened on the phone. It is allowed to move left and right to the adjacent photo by swiping finger over…

B. Beautiful Paintings 题目连接: http://www.codeforces.com/contest/651/problem/B Description There are n pictures delivered for the new exhibition. The i-th painting has beauty ai. We know that a visitor becomes happy every time he passes from a painting…

A. Minimum Difficulty time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Mike is trying rock climbing but he is awful at it. There are n holds on the wall, i-th hold is at height ai off the g…

A. Hongcow Learns the Cyclic Shift time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Hongcow is learning to spell! One day, his teacher gives him a word that he needs to learn to spell. Bein…

A. Vanya and Cubes time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Vanya got n cubes. He decided to build a pyramid from them. Vanya wants to build the pyramid as follows: the top level of…

A. Beru-taxi time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Vasiliy lives at point (a, b) of the coordinate plane. He is hurrying up to work so he wants to get out of his house as soon as…

A. Karen and Morning time limit per test 2 seconds memory limit per test 512 megabytes input standard input output standard output Karen is getting ready for a new school day! It is currently hh:mm, given in a 24-hour format. As you know, Karen loves…

A. Straight «A» time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Noora is a student of one famous high school. It's her final year in school — she is going to study in university next year.…

A. Dasha and Stairs time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output On her way to programming school tiger Dasha faced her first test — a huge staircase! The steps were numbered from one t…

A. Games time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Manao works on a sports TV. He's spent much time watching the football games of some country. After a while he began to notice diffe…

B. Robot's Task time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Robot Doc is located in the hall, with n computers stand in a line, numbered from left to right from 1 to n. Each computer co…

                                                                              D. Once Again... You are given an array of positive integers a1, a2, ..., an × T of length n × T. We know that for any i > n it is true that ai = ai - n. Find the length of…