统计n个数中的1的个数

#include<iostream>
#include<cstdio>
#include<stdlib.h>
using namespace std;
int main()
{
    freopen("rand.txt","r",stdin);
    freopen("xuduoshudeyi.out","w",stdout);
    int n,count=0,x;
    scanf("%d",&n);
    for(int i=1;i<=n;++i)
    {
        scanf("%d",&x);
        for(int j=1;j<=x;++j)
        {
        int k=j;
        while(k>0)
             {
            if(k%10==1)
            count+=1;
            k/=10;
             }
        }
    }
    printf("%d",count);
    fclose(stdin);
    fclose(stdout);
    system("xuduoshudeyi.out");
    return 0;
}