B. Bear and Friendship Condition time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Bear Limak examines a social network. Its main functionality is that two members can become friends (then th…

B. Bear and Friendship Condition time limit per test:1 second memory limit per test:256 megabytes input:standard input output:standard output Bear Limak examines a social network. Its main functionality is that two members can become friends (then th…

题意:如果1认识2,2认识3,必须要求有:1认识3.如果满足上述条件,输出YES,否则输出NO. 思路:显然如果是一个完全图就输出YES,否则就输出NO,如果是无向完全图则一定有我们可以用dfs来书边和点 n个节点的有向完全图边数为e=n*(n-1) 代码: #include <bits/stdc++.h> #define maxn 150000 #define ll long long using namespace std; vector <]; ]; int t; void dfs…

B. Bear and Friendship Condition time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Bear Limak examines a social network. Its main functionality is that two members can become friends (then th…

B. Bear and Friendship Condition 题目连接: http://codeforces.com/contest/791/problem/B Description Bear Limak examines a social network. Its main functionality is that two members can become friends (then they can talk with each other and share funny pic…

B. Bear and Friendship Condition time limit per test:1 second memory limit per test:256 megabytes input:standard input output:standard output Bear Limak examines a social network. Its main functionality is that two members can become friends (then th…

Bear and Friendship Condition time limit per test 1 secondmemory limit per test 256 megabytesinput standard inputoutput standard output Bear Limak examines a social network. Its main functionality is that two members can become friends (then they can…

B. Bear and Friendship Condition time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Bear Limak examines a social network. Its main functionality is that two members can become friends (then th…

题目链接: http://codeforces.com/problemset/problem/653/B 题意: 要求你构造一个长度为n的字符串使得通过使用m个操作,最终获得字符a.已知第i个操作将字符串中开头的字符串ai换成字符bi,长度减少1.问一共有多少种字符串构造方法. 分析: 直接dfs一下就好啦~~~ 代码: #include<iostream> #include<algorithm> #include<vector> using namespace std…

Bear Limak examines a social network. Its main functionality is that two members can become friends (then they can talk with each other and share funny pictures). There are n members, numbered 1 through n. m pairs of members are friends. Of course, a…

题目大意:给定一张无向图,要求如果 A 与 B 之间有边,B 与 C 之间有边,那么 A 与 C 之间也需要有边.问这张图是否满足要求. 题解:根据以上性质,即:A 与 B 有关系,B 与 C 有关系,那么 A 和 C 也要有关系,因此可以采用并查集加以维护,维护关系的同时顺便维护各个联通块的大小,若符合题目要求,则同一个联通块中的点必须均有关系.因此,最后计算一下每个联通块的应有关系数和最初所给的关系数比较,相等则符合,反之,不符合. 代码如下 #include <bits/stdc++.h>…

[题目链接]:http://codeforces.com/contest/791/problem/B [题意] 给你m对朋友关系; 如果x-y是朋友,y-z是朋友 要求x-z也是朋友. 问你所给的图是否符合 [题解] 用并查集处理出每个朋友"团"的大小->就是连通块 然后这个连通块里面应该要有x*(x-1)/2条边; 按照这个规则,求出应该有的边数; 然后和所给的m对比; 相同则YES,否则NO [完整代码] #include <bits/stdc++.h> usin…

和FallDream组队瞎打一通--B两个人写的都挂了233,最后只剩下FallDream写的A和我写的C,最后我yy了个E靠谱做法结果打挂了,结束之后改了改就A了,难受. AC:AC Rank:180 Rating:2133-8->2125 A.Bear and Friendship Condition 题目大意:问一个无向图是否满足若a到b有边且b到c有边则a到c有边.(n<=150,000) 思路:判定每个连通块是不是团,不是则不满足,复杂度O(n). #include<cstdi…

Bear and Big Brother 签到题,直接模拟就可以了. Bear and Friendship Condition 满足只能是每个朋友圈中每个人和其他人都是朋友,这样的边数的确定的. 然后并查集求每个朋友圈大小再判断是否合法就可以啦. #include<cstring> #include<cstdio> #include<cmath> #include<algorithm> #define LL long long #define maxn 3…

Codeforces Round #405 (rated, Div. 2, based on VK Cup 2017 Round 1) 全场题解 菜鸡只会A+B+C,呈上题解: A. Bear and Big Brother 题意:我也没看太清,就是给你两个10以内的数a,b.a每天乘以3,b每天乘以2,求多少天后a大于b. 思路:应该是有公式的,不过看到数据这么小直接暴力乘求解.官方题解貌似就是这样,数据小就是水题. const int N=1e3+10; int main() { int a…

A. Bear and Big Brother time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Bear Limak wants to become the largest of bears, or at least to become larger than his brother Bob. Right now, Limak…

D. Bear and Tower of Cubes 题目连接: http://www.codeforces.com/contest/680/problem/D Description Limak is a little polar bear. He plays by building towers from blocks. Every block is a cube with positive integer length of side. Limak has infinitely many…

题目链接: D. Bear and Tower of Cubes time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Limak is a little polar bear. He plays by building towers from blocks. Every block is a cube with positive…

题目链接: B. Bear and Compressing time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Limak is a little polar bear. Polar bears hate long strings and thus they like to compress them. You should al…

链接 Codeforces 680D Bear and Tower of Cubes 题意 求一个不超过 \(m\) 的最大体积 \(X\), 每次选一个最大的 \(x\) 使得 \(x^3\) 不超过当前剩余体积.问在能选最多个数的情况下,\(X\) 最大是多少 思路 对于每一次选择,首先要保证选完后的剩余体积最大,这样就保证了能选最多个数.然后在这基础上保证 \(X\) 最大. 考虑对于最大的 \(a\),使得 \(a^3<=m\). 如果当前选择的是 \(a\),则剩余体积就是 \(m1…

Friendship Time Limit: 2000MS   Memory Limit: 20000K Total Submissions: 10626   Accepted: 2949 Description In modern society, each person has his own friends. Since all the people are very busy, they communicate with each other only by phone. You can…

Friendship Time Limit: 2000MS Memory Limit: 20000K Total Submissions: 9824 Accepted: 2720 Description In modern society, each person has his own friends. Since all the people are very busy, they communicate with each other only by phone. You can assu…

B. New Year and Old Property 题目连接: http://www.codeforces.com/contest/611/problem/B Description The year 2015 is almost over. Limak is a little polar bear. He has recently learnt about the binary system. He noticed that the passing year has exactly on…

Anniversary Cake Time Limit: 1000MSMemory Limit: 10000KB64bit IO Format: %I64d & %I64u Submit Status Description Nahid Khaleh decides to invite the kids of the "Shahr-e Ghashang" to her wedding anniversary. She wants to prepare a square-shap…

题目链接 F. Bear and Fair Set time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Limak is a grizzly bear. He is big and dreadful. You were chilling in the forest when you suddenly met him. It's v…

B. Bear and Compressing time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Limak is a little polar bear. Polar bears hate long strings and thus they like to compress them. You should also kno…

Friendship Time Limit: 2000MS   Memory Limit: 20000K Total Submissions: 11429   Accepted: 3173 Description In modern society, each person has his own friends. Since all the people are very busy, they communicate with each other only by phone. You can…

题目描述 A tree is an undirected connected graph without cycles. The distance between two vertices is the number of edges in a simple path between them. Limak is a little polar bear. He lives in a tree that consists of n vertices, numbered 1 through n. L…

     E. Bear and Drawing time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Limak is a little bear who learns to draw. People usually start with houses, fences and flowers but why would bears…

Friendship Time Limit: 2000MS   Memory Limit: 20000K Total Submissions: 8025   Accepted: 2224 Description In modern society, each person has his own friends. Since all the people are very busy, they communicate with each other only by phone. You can…