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Ural 1353 Milliard Vasya's Function

2015-05-14 23:17 330 查看
题意:统计1-1e9中数位和为S的数的个数

链接:http://acm.timus.ru/problem.aspx?space=1&num=1353

思路:解法一、暴力打表,直接输出表

解法二、数位dp,dp[i][j]表示放到第i个数,和为j的个数

注意点:无

以下为AC代码:

IDDateAuthorProblemLanguageJudgement resultTest #Execution timeMemory used
624757120:17:47

14 May 2015
luminous111353. Milliard Vasya's FunctionG++ 4.9 C++11Accepted0.031366 KB
/*
***********************************************
*# @Author  : Luminous11 (573728051@qq.com)
*# @Date    : 2015-05-14 23:05:21
*# @Link    : http://blog.csdn.net/luminous11 ***********************************************
*/
//暴力打表代码
#include <bits/stdc++.h>
#define clr(a, v) memset( a , v , sizeof(a) )
using namespace std;
const double eps = 1e-10;
const double pi = acos(-1.0);
int ans[85] = { 0, 10, 45, 165, 495, 1287, 3003, 6435, 12870, 24310, 43749, 75501, 125565, 202005, 315315, 478731, 708444, 1023660, 1446445, 2001285, 2714319, 3612231, 4720815, 6063255, 7658190, 9517662, 11645073, 14033305, 16663185, 19502505, 22505751, 25614639, 28759500, 31861500, 34835625, 37594305, 40051495, 42126975, 43750575, 44865975, 45433800, 45433800, 44865975, 43750575, 42126975, 40051495, 37594305, 34835625, 31861500, 28759500, 25614639, 22505751, 19502505, 16663185, 14033305, 11645073, 9517662, 7658190, 6063255, 4720815, 3612231, 2714319, 2001285, 1446445, 1023660, 708444, 478731, 315315, 202005, 125565, 75501, 43749, 24310, 12870, 6435, 3003, 1287, 495, 165, 45, 9, 1 };
int main()
{
int n;
while ( cin >> n ){
cout << ans
<< endl;
}
return 0;
}
//打表部分
// int k = 1e9;
// int num[105];
// int calc ( int n )
// {
// 	int ret = 0;
// 	while ( n ){
// 		ret += n % 10;
// 		n /= 10;
// 	}
// 	return ret;
// }
// int main()
// {
// 	ios::sync_with_stdio ( false );
// 	freopen ( "data.in", "w", stdout );
// 	memset ( num, 0, sizeof ( num ) );
// 	for ( int i = 1; i <= k; i ++ ){
// 		int n = calc ( i );
// 		num
++;
// 	}
// 	for ( int i = 1; i < 82; i ++ ){
// 		cout << num[i] << ", ";
// 	}
//     return 0;
// }
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