UVa 488 - Triangle Wave

#include<stdio.h>
int main()
{
int n,a,f;
while (scanf("%d",&n) != EOF )
for ( int i = 1 ; i <= n ; i++ )
{
scanf("%d%d",&a,&f);
for ( int j = 1 ; j <= f ;  j++ )
{
for ( int k = 1 ; k <= a ; k++ )
{
for ( int l = 1 ; l <= k ; l++ )
printf("%d",k);
printf("\n");
}
for ( int k = a-1 ; k >= 1 ;  k-- )
{
for ( int l = 1 ; l <= k ;  l++ )
printf("%d",k);
printf("\n");
}
if ( j < f )
printf("\n");
}
if ( i < n )
printf("\n");
}
return 0;
}