Poj Solution 2565

http://poj.org/problem?id=2565

//* @author  mekarlos@gmail.com
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Scanner;
import java.util.StringTokenizer;
public class Main {
 public static void main(String[] args) throws IOException{
  // TODO Auto-generated method stub
  Scanner scan=new Scanner(System.in);
  BufferedReader stdin=new BufferedReader(new InputStreamReader(System.in));
  StringTokenizer tokens;
  tokens=new StringTokenizer(scan.nextLine());
  int n=new Integer(tokens.nextToken());
  double d=new Double(tokens.nextToken());
  double result;
  int num;
  String a="";
  int h,m,s;
  int i1,i2;
  int aux;
  while(scan.hasNext()){
    h=0;
    m=0;
    s=0;
    tokens=new StringTokenizer(scan.nextLine());
    num=new Integer(tokens.nextToken());
    for(int i=0;i< n;i++){
        a=tokens.nextToken();
        if(a.lastIndexOf('-')>=0) {
            h=-1;
            break;
        }
        i1=a.indexOf(':');
        i2=a.lastIndexOf(':');
        aux=new Integer(a.substring(0, i1));
        h+=aux;
        aux=new Integer(a.substring(i1+1,i2));
        m+=aux;
        s+=new Integer(a.substring(i2+1,a.length()));
    }
    if(h==-1) {
            a=num+"";
            for(int j=0;j< 3-a.length();j++) System.out.print(" ");
            System.out.print(num+": -n");
    }
    else{
            result=h*3600+m*60+s;
            result=result/(d*60);
            m=(int)Math.floor(result);
            result=result-m;
            result*=60;
            s=(int)Math.round(result);
            if(s==60){
                s=0;
                m++;
            }
            a=num+"";
            for(int j=0;j< 3-a.length();j++) System.out.print(" ");
            a="";
            if(s< 10)a="0";
            System.out.print(num+": "+m+":"+a+s+" min/kmn");
    }
  }
 }
}