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codeforces Gym 100338E Numbers
题目:http://codeforces.com/gym/100338/attachments贪心,每次枚举10的i次幂,除k后取余数r在用k-r补在10的幂上作为候选答案。#includeusing namespace std;typedef unsigned long long ull;cons...
分类:其他好文   时间:2015-08-21 19:26:23    阅读次数:245
codeforces Gym 100338H High Speed Trains
递推就好了,用二项式定理算出所有连边的方案数,减去不合法的方案,每次选出一个孤立点,那么对应方案数就是上次的答案。枚举选几个孤立点和选哪些,选到n-1个点的时候相当于都不选,只减1。要用到高精度,直接开100*100的组合数数组会MLE,用滚动数组优化一下就好了。不会java,python太伤了#i...
分类:其他好文   时间:2015-08-21 19:02:50    阅读次数:208
codeforces Gym 100338C Important Roads
正反两次最短路用于判断边是不是最短路上的边,把最短路径上的边取出来。然后求割边。#includeusing namespace std;typedef long long ll;#define fi first#define se second#define bug(x) coutdfn[u]) {...
分类:其他好文   时间:2015-08-21 18:58:29    阅读次数:137
codeforces Gym 100187J J. Deck Shuffling dfs
J. Deck ShufflingTime Limit: 20 SecMemory Limit: 256 MB题目连接http://codeforces.com/gym/100187/problem/JDescriptionThe world famous scientist Innokentiy ...
分类:其他好文   时间:2015-08-21 13:15:19    阅读次数:179
Codeforces Gym 100463D Evil DFS
题目连接http://codeforces.com/gym/100463/attachmentsDescriptionRichard is evil. He wants to give another geometry problem to the participants of this cont...
分类:其他好文   时间:2015-08-21 11:09:11    阅读次数:153
Gym 100418J Lucky tickets(数位dp)
题意:给定一个n,求区间[1, n]之间的所有的a的个数,a满足: a能整除  把a表示自身二进制以后1的个数 思路:题意很绕.... 数位dp,对于所有可能的1的个数我们都dfs一次 对于某一个可能的1的个数p来说,状态dp(len, i, j, k)里的每一位分别表示当前位,当前确定位的值模除p,已经有了多少个1,是否已经小于给定的n, 注意的是这题范围很大,要用unsigned l...
分类:其他好文   时间:2015-08-20 06:48:38    阅读次数:102
codeforces Gym 100500C C. ICPC Giveaways 暴力
Problem C. ICPC GiveawaysTime Limit: 20 SecMemory Limit: 256 MB题目连接http://codeforces.com/gym/100500/attachmentsDescriptionDuring the preparation for t...
分类:其他好文   时间:2015-08-19 13:00:38    阅读次数:346
Codeforces Gym 100513M M. Variable Shadowing 暴力
M. Variable ShadowingTime Limit: 20 SecMemory Limit: 256 MB题目连接http://codeforces.com/gym/100513/problem/MDescriptionIn computer programming,variable s...
分类:Windows程序   时间:2015-08-19 10:43:51    阅读次数:184
POJ2735/Gym 100650E Reliable Nets dfs
Problem E: Reliable NetsYou’re in charge of designing a campus network between buildings and are very worried about itsreliability and its cost. So, y...
分类:Web程序   时间:2015-08-19 01:52:56    阅读次数:465
Gym 100650H Two Ends DFS+记忆化搜索
Problem H: Two EndsIn the two-player game “Two Ends”, an even number of cards is laid out in a row. On each card, faceup, is written a positive intege...
分类:其他好文   时间:2015-08-18 21:11:14    阅读次数:177
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