VF 查表

题目的意思就是 给你一个数字 n (1~81)  然后问你从 1~10^9  之中有多少个 各位数字之和等于 n 的 数字

我上去   打表了  而且速度还差不多 , 能在 几十分钟内算出来所有答案 . 下面附上 打表的方法

#include<stdio.h>
#include<string.h>
#include<math.h>
#include<iostream>
#include<limits.h>
#include<algorithm>
#include<queue>
#include<vector>
#include<set>
#include<stack>
#include<string>
#include<sstream>
#include<map>
#include<cctype>
using namespace std;
int main()
{
    int sum,q,j,m,result,flag;
    for(int n=1;n<=2;n++)
    {   result=0;
        for(int i=1;i<=1000000000;i++)
        {
            j=i;
            flag=sum=0;
            while(j>0)
            {
                sum+=j%10;
                j=j/10;
                if(sum>n)
                    break;
            }
            if(sum==n)
                result++;
        }
        printf("%d
",result);
    }
}

算出来结果之后  就打表  .复制出来 

 1 #include<stdio.h>
 2 #include<string.h>
 3 #include<math.h>
 4 #include<iostream>
 5 #include<limits.h>
 6 #include<algorithm>
 7 #include<queue>
 8 #include<vector>
 9 #include<set>
10 #include<stack>
11 #include<string>
12 #include<sstream>
13 #include<map>
14 #include<cctype>
15 using namespace std;
16 int main()
17 {
18     int a[]={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};
19     int n;
20     while(scanf("%d",&n)!=EOF)
21     {
22         printf("%d
",a[n]);
23     }
24     return 0;
25 }

这个好像 有点傻了......

原文地址:https://www.cnblogs.com/A-FM/p/5457771.html