Color Me Less

http://poj.org/problem?id=1046

#include<stdio.h>
#include<math.h>
int main()
{
    int r[16], g[16], b[16] ;
    int i ;
    int x, y, z ;
    int min, s ;
    for(i=0; i<16; i++)
    scanf("%d%d%d",&r[i],&g[i],&b[i]) ;
    while(scanf("%d%d%d",&x,&y,&z)!=EOF)
    {
        if(x==-1&&y==-1&&z==-1)
        break ;
        min = (x-r[0])*(x-r[0]) + (y-g[0])*(y-g[0]) + (z-b[0])*(z-b[0]) ;
        int f = 0 ;
        for(i=1; i<16; i++)
        {
            s = (x-r[i])*(x-r[i]) + (y-g[i])*(y-g[i]) + (z-b[i])*(z-b[i]) ;
            if(s<min)
            {
                min = s ;
                f = i ;
            }
        }
        printf("(%d,%d,%d) maps to (%d,%d,%d)\n", x, y, z, r[f],g[f],b[f]) ;
    }
    return 0 ;
}