Petya loves lucky numbers. Everybody knows that positive integers are lucky if their decimal representation doesn't contain digits other than 4 and 7. ...
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其他好文 时间:
2017-07-30 00:54:06
阅读次数:
169
题目大意:很多人@一个人,如果那个人忍不住说话了,就轰炸成功,如果那个人没说话或者别的人没有@他或@很多个人,则轰炸失败。(具体见原题) 解题思路:字符串处理,好好用sscanf即可(细节见代码)。 C++ Code: ...
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其他好文 时间:
2017-07-28 09:52:51
阅读次数:
210
对于正整数n,定义f(n)为n所含质因子的最大幂指数。例如f(1960)=f(2^3 * 5^1 * 7^2)=3, f(10007)=1, f(1)=0。 给定正整数a,b,求sigma(sigma(f(gcd(i,j)))) (i=1..a, j=1..b)。 Input 第一行一个数T,表示询 ...
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其他好文 时间:
2017-07-27 23:37:28
阅读次数:
356
DZY has a hash table with p buckets, numbered from 0 to p?-?1. He wants to insert n numbers, in the order they are given, into the hash table. For the ...
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其他好文 时间:
2017-07-25 16:35:36
阅读次数:
180
题意:n张牌,选k个排成一圈,给出L,求出最大R 使得[L,R]内任意一个数 都可以由圈内连续m个数异或得到.n<=20,k<=6,a[i],L<=100. m为自己设定的. 暴力 总共有A(20,6)种方案 每种方案k^2算出异或数 TLE..先C(20,6)选出方案 若能过最优性剪支,在全排列更 ...
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其他好文 时间:
2017-07-23 18:22:50
阅读次数:
118
英文题面: De Prezer loves movies and series. He has watched the Troy for like 100 times and also he is a big fan of Supernatural series.So, he did some re ...
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其他好文 时间:
2017-07-22 23:44:01
阅读次数:
220
E DZY Loves Fibonacci Numbers In mathematical terms, the sequence Fn of Fibonacci numbers is defined by the recurrence relation DZY loves Fibonacci nu ...
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其他好文 时间:
2017-07-21 14:12:40
阅读次数:
361
D - DZY Loves Modification As we know, DZY loves playing games. One day DZY decided to play with a n?×?mmatrix. To be more precise, he decided to modi ...
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其他好文 时间:
2017-07-21 10:51:07
阅读次数:
162
C - DZY Loves Sequences DZY has a sequence a, consisting of n integers. We'll call a sequence ai,?ai?+?1,?...,?aj (1?≤?i?≤?j?≤?n) a subsegment of the ...
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其他好文 时间:
2017-07-21 10:27:08
阅读次数:
125
447C - DZY Loves Sequences 思路:dp 代码: ...
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其他好文 时间:
2017-07-18 13:29:53
阅读次数:
116