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
...
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其他好文 时间:
2014-05-10 09:46:45
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232
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...
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其他好文 时间:
2014-05-07 07:38:20
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415
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...
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其他好文 时间:
2014-05-07 07:20:50
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356
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...
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编程语言 时间:
2014-05-07 06:13:32
阅读次数:
428
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...
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其他好文 时间:
2014-05-07 04:55:37
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314
ACM 博弈 Good Luck in CET-4 Everybody! hdu1847 规律...
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其他好文 时间:
2014-05-05 13:20:41
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359
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...
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移动开发 时间:
2014-05-05 13:01:21
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339
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...
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其他好文 时间:
2014-05-03 17:35:30
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345
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...
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其他好文 时间:
2014-05-03 16:45:31
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234
ACM 尼姆博弈 Being a Good Boy in Spring Festival hdu1850...
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编程语言 时间:
2014-05-03 16:25:26
阅读次数:
330