UVA_488:Triangle Wave

PS:The input begins with a single positive integer on a line by itself indicating the number of the cases following, each of them as described below. This line is followed by a blank line, and there is also a blank line between two consecutive inputs.

Sample Input
3
2
Sample Output
1
22
333
22
1

1
22
333
22
1

Language:C++ 4.8.2

#include<stdio.h> 
int main(void)
{
    int m, n, total;
    int copy_i;
    scanf("%d", &total);
    while(total--)
    {
        scanf("%d%d", &m, &n);
        while(n--)
        {
            for(int i = 1; i <= m; i++)
            {
                copy_i = i;
                while(copy_i--)
                    printf("%d", i);
                printf("\n");
            }
            for(int i = m-1; i >=1; i--)
            {
                copy_i = i;
                while(copy_i--)
                    printf("%d", i);
                printf("\n");
            }
            if(n) // there is a blank line after each separate waveform, excluding the last one.
                printf("\n");
        }
        if(total) // 同上，缺少的话WA。
            printf("\n");
    }
    return 0;
}

// 再PS:该题关键是格式，每两组之间两个空行，单组之内的三角波之间有一个空行。