C++ :

#include <cmath>
#include <cstdio>
#include <cstring>
using namespace std;

double dis(double a, double b, double c, double d) {
  return sqrt((a - c) * (a - c) + (b - d) * (b - d));
}
int main() {
	//freopen("Problem2.in", "r", stdin);
	//freopen("Problem2.out", "w", stdout);
  double x1, x2, x3, y1, y2, y3;
  double d1, d2, d3, r1, r2, r3;
  while (scanf("%lf %lf %lf %lf %lf %lf", &x1, &y1, &x2, &y2, &x3, &y3) !=
         EOF) {
    d1 = dis(x1, y1, x2, y2);
    d2 = dis(x2, y2, x3, y3);
    d3 = dis(x1, y1, x3, y3);
    r1 = (d3 + d1 - d2) / 2;
    r2 = (d1 + d2 - d3) / 2;
    r3 = (d2 + d3 - d1) / 2;
    printf("%.0lf\n", r1);
    printf("%.0lf\n", r2);
    printf("%.0lf\n", r3);
  }
  return 0;
}

Java :

import java.io.*;
import java.util.*;

public class Main{
 final static Scanner jin=new Scanner(System.in);
  public static void main(String args[]){
    while(jin.hasNextInt()){
      int ax=jin.nextInt(); 
      int ay=jin.nextInt();
      int bx=jin.nextInt();
      int by=jin.nextInt();
      int cx=jin.nextInt();
      int cy=jin.nextInt();
      double ab=Math.sqrt((ax-bx)*(ax-bx)+(ay-by)*(ay-by));
      double bc=Math.sqrt((cx-bx)*(cx-bx)+(cy-by)*(cy-by));
      double ca=Math.sqrt((ax-cx)*(ax-cx)+(ay-cy)*(ay-cy));
      System.out.println((int)((ab+ca-bc)/2));
      System.out.println((int)((ab+bc-ca)/2));
      System.out.println((int)((bc+ca-ab)/2));
    }
  }
}