PKU ACM 1046

题目：
Input
The input is a list of RGB colors, one color per line, specified as three integers from 0 to 255 delimited by a single space. The first sixteen colors form the target set of colors to which the remaining colors will be mapped. The input is terminated by a line containing three -1 values.
Output
For each color to be mapped, output the color and its nearest color from the target set.

If there are more than one color with the same smallest distance, please output the color given first in the color set.
Sample Input

0 0 0
255 255 255
0 0 1
1 1 1
128 0 0
0 128 0
128 128 0
0 0 128
126 168 9
35 86 34
133 41 193
128 0 128
0 128 128
128 128 128
255 0 0
0 1 0
0 0 0
255 255 255
253 254 255
77 79 134
81 218 0
-1 -1 -1

Sample Output

(0,0,0) maps to (0,0,0)
(255,255,255) maps to (255,255,255)
(253,254,255) maps to (255,255,255)
(77,79,134) maps to (128,128,128)
(81,218,0) maps to (126,168,9)

Answer:

#include <iostream>
using std::cout ;
using std::cin ;
using std::endl ;

#include <cmath>

int main()
{
int a[16][3] = {0};
int b[100][3] = {0} ;
int size = 0 ;
int lowest = 65025 ;
double result = 0 ;
int index = 0 ;

for(int i=0 ;i<16;i++)
{
for(int j = 0 ; j<3 ;j++)
{
cin >> a[i][j] ;
}
}

for(int k = 0 ; ;k++)
{
for(int m = 0 ; m <3 ; m++)
{
cin >> b[k][m] ;
}
if(b[k][0]==-1&&b[k][1]==-1&&b[k][2]==-1)
{
break ;
}
size++ ;

}

for(int p = 0 ; p < size ; p++)
{
for(int q = 0 ;q < 16 ;q++)
{
double temp = 0.0 ;
temp = ((b[p][0]-a[q][0])*(b[p][0]-a[q][0])+(b[p][1]-a[q][1])*(b[p][1]-a[q][1])+(b[p][2]-a[q][2])*(b[p][2]-a[q][2]));
result = sqrt(temp);
if(result < lowest)
{
lowest = result ;
index = q ;
}
}
cout << "("<<b[p][0]<<","<<b[p][1]<<","<<b[p][2]<<") maps to ("<<a[index][0]<<","<<a[index][1]<<","<<a[index][2]<<")" << endl ;
lowest = 65025 ;
}
return 0 ;
}