sicily 1608. Digit Counting

Description
Trung is bored with his mathematics homeworks. He takes a piece of chalk and starts writing a sequence of consecutive integers starting with 1 to N (1 < N < 10000) . After that, he counts the number of times each digit (0 to 9) appears in the sequence. For example, with N = 13 , the sequence is:

12345678910111213

In this sequence, 0 appears once, 1 appears 6 times, 2 appears 2 times, 3 appears 3 times, and each digit from 4 to 9 appears once. After playing for a while, Trung gets bored again. He now wants to write a program to do this for him. Your task is to help him with writing this program.

Input
The input file consists of several data sets. The first line of the input file contains the number of data sets which is a positive integer and is not bigger than 20. The following lines describe the data sets.

For each test case, there is one single line containing the number N .

Output
For each test case, write sequentially in one line the number of digit 0, 1,...9 separated by a space.

水题，貌似是机考有一题简单版的（直接统计输入数字本身的数字个数），加一个枚举直接AC

#include<stdio.h>
int freq[10];
void count( int n )
{
    do{
        freq[n % 10]++;
        n /= 10;
    }while( n != 0 );
}
int main()
{
    int i, t, n;
    
    scanf("%d", &t);
    while(t--)
    {
        for( i = 0; i < 10; i++ )
            freq[i]=0;
        
        scanf("%d", &n);
        for( i = 1; i <= n; i++ )
            count(i);
        
        for( i = 0; i < 10; i++ )
            if( i != 9 )
                printf("%d ", freq[i]);
            else
                printf("%d\n", freq[i]);
    }
    
    return 0;
}