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hdu 4722 Good Numbers(dp)
题目链接:hdu 4722 Good Numbers 题目大意:给出a,b,问从a到b之间,有多少个好数字,好数字的定义为:每个位的数字相加是10的倍数。 解题思路:dp[i][j]表示第i位,前i-1位的和为j(j可以从200简化成10,以为只需要考虑最后的数是否是10的倍数即可)有多少个数,需要注意的就是恰好为b的情况,所以要有一个跟踪值s。 #include ...
分类:其他好文   时间:2014-05-10 09:46:45    阅读次数:232
codechef Jewels and Stones 题解
Soma is a fashionable girl. She absolutely loves shiny stones that she can put on as jewellery accessories. She has been collecting stones since her childhood - now she has become really good with ide...
分类:其他好文   时间:2014-05-07 07:38:20    阅读次数:415
codechef Little Elephant and Permutations题解
The Little Elephant likes permutations. This time he has a permutation A[1], A[2], ..., A[N] of numbers 1, 2, ...,N. He calls a permutation A good, if the number of its inversions is equal to the n...
分类:其他好文   时间:2014-05-07 07:20:50    阅读次数:356
HDU 1850 Being a Good Boy in Spring Festival (Nim游戏变形)
题意:经典Nim游戏博弈,给你n堆牌,每堆a[i]张,每次能从一堆中取出任一张(不能为0),最后不能取者为输 问先手有几种取法保证他最后能获胜。 思路:让Nim_sum=0(a[1]^a[2]…………^a[n]=0)时则输,利用这个定理,对于第i堆a[i],除了第i堆,其它的 Nim_sum=k,如果a[i]>k,则先手从第i堆可以取a[i]-k张牌,让a[i]=k,最后a[i]^k...
分类:编程语言   时间:2014-05-07 06:13:32    阅读次数:428
HDU 4722 Good Numbers (数位dp)
题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=4722 思路:数位dp,dp[i][j]表示到第i位,数字和%10为j,然后进行dp,注意完全匹配的情况是要+1,而其他情况是从0 到 9 都要考虑 代码: #include #include #include #include using namespace std; int t; l...
分类:其他好文   时间:2014-05-07 04:55:37    阅读次数:314
ACM-博弈之Good Luck in CET-4 Everybody!——hdu1847
ACM 博弈 Good Luck in CET-4 Everybody! hdu1847 规律...
分类:其他好文   时间:2014-05-05 13:20:41    阅读次数:359
android File存储
文件存储的用途: A File object is suited to reading or writing large amounts of data in start-to-finish order without skipping around. For example, it's good for image files or anything exchanged over a netw...
分类:移动开发   时间:2014-05-05 13:01:21    阅读次数:339
【LeetCode】Reverse Integer
题目 Reverse digits of an integer. Example1: x = 123, return 321 Example2: x = -123, return -321 Have you thought about this? Here are some good questions to ask before coding. Bonus points...
分类:其他好文   时间:2014-05-03 17:35:30    阅读次数:345
Codeforce 214 Div 2 B.Hometask
题目描述: Description Furik loves math lessons very much, so he doesn't attend them, unlike Rubik. But now Furik wants to get a good mark for math. For that Ms. Ivanova, his math teacher, gave him...
分类:其他好文   时间:2014-05-03 16:45:31    阅读次数:234
ACM-尼姆博弈之Being a Good Boy in Spring Festival——hdu1850
ACM 尼姆博弈 Being a Good Boy in Spring Festival hdu1850...
分类:编程语言   时间:2014-05-03 16:25:26    阅读次数:330
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