题目:nyoj 1189 yougth和他的朋友们
这题目是14年北京赛区的原题,讲题的时候说有三种解法,我们是用dp做的当时,原题目链接:Happy Matt Friends
题意就不在说了。因为要求的是满足条件的种数。
我们定义状态dp【i】【j】:当我们把第 i 个数放进去之后得到 j 的种数是多少
那么我们可以得到状态转移方程:dp【i】【j^ a [ i ] 】 ...
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其他好文 时间:
2015-03-31 20:12:26
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122
题目:http://www.lydsy.com/JudgeOnline/problem.php?id=3916题解:随便hash.刚开始看错题WA了N发.(我连双hash都写了!)代码: 1 #include 2 #include 3 #include 4 #include 5 #include 6...
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其他好文 时间:
2015-03-31 19:36:28
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96
枚举断点,哈希判断。#includeusing namespace std;typedef unsigned long long ull;ull hs,hs1,hs2,seeds[1000010],hsgoal;int n;int del=-1;char s[2000002],s2[2000002]...
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其他好文 时间:
2015-03-30 11:01:28
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228
这里介绍一个基础的搜索引擎技术
假如有两段文字
1,books and friends should be few but good
2,A good book is a good friend
假如我们忽略掉大小写和复数,可以整理出一张单词表,显示哪个单词再哪段文字,
英文单词
文章编号
a
2
and
1
be
1
bo...
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其他好文 时间:
2015-03-29 22:17:03
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450
题目链接:http://poj.org/problem?id=1815In modern society, each person has his own friends. Since all the people are very busy, they communicate with each ...
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其他好文 时间:
2015-03-20 23:29:59
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214
A boy named Gena really wants to get to the “Russian Code Cup” finals, or at least get a t-shirt. But the offered problems are too complex, so he made an arrangement with his n friends that they will s...
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编程语言 时间:
2015-03-16 14:36:02
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141
E - Happy Matt Friends
Time Limit:6000MS Memory Limit:510000KB 64bit IO Format:%I64d
& %I64u
Submit Status Practice HDU
5119
Description
Matt has N friends. They are playing ...
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其他好文 时间:
2015-03-16 13:00:17
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142