Lennot

import java.util.ArrayList;
import java.util.TreeSet;

public class Lennot{
    
    private static int n;
    private static boolean[] beenTo;
    private static ArrayList<flight>[] connections;
    private static TreeSet<destination> currentNodes;
    
    public static void main(String[] args){
        IO io = new IO();
        
        n = io.nextInt();
        int m = io.nextInt();
        
        beenTo = new boolean[n];
        connections = new ArrayList[n];
        for(int i = 0; i < n; i++)
            connections[i] = new ArrayList();
        
        
        for(int i = 0; i < m; i++){
            int a = io.nextInt() - 1, b = io.nextInt() - 1, h = io.nextInt();
            connections[a].add(new flight(b, h));
        }
        
        currentNodes = new TreeSet();
        currentNodes.add(new destination(0, 0));
        
        while(currentNodes.first().city != n-1)
            fly();
        
        
        io.println(currentNodes.first().price);
        io.close();
    }
    
    private static void fly(){
        
        long price = currentNodes.first().price;
        int city = currentNodes.pollFirst().city;
        
        for(flight f: connections[city]){
            
            long newPrice = price + f.price;
            
            if(f.city == n-1)
                currentNodes.add(new destination(n-1, newPrice));
            
            for(flight f2: connections[f.city]){
                if(!beenTo[f2.city]){
                    beenTo[f2.city] = true;
                    currentNodes.add(new destination(f2.city, newPrice));
                }
            }
        }
    }
    
    private static class destination implements Comparable{
        int city;
        Long price;
        
        public destination(int city, long price){
            this.city = city;
            this.price = price;
        }
        
        @Override
        public int compareTo(Object o){
            int ans = price.compareTo(((destination)o).price);
            if(ans == 0)
                return 1;
            return ans;
           
        }
    }
    
    private static class flight{
        int city, price;
        
        public flight(int city, int price){
            this.city = city;
            this.price = price;
        }
    }
}

Test 1

Group: 1

Verdict: WRONG ANSWER

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: WRONG ANSWER

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: WRONG ANSWER

Test 7

Group: 2

Verdict: WRONG ANSWER

Test 8

Group: 2

Verdict: WRONG ANSWER

Test 9

Group: 2

Verdict: WRONG ANSWER

Test 10

Group: 2

Verdict: WRONG ANSWER

Test 11

Group: 3

Verdict: WRONG ANSWER

Test 12

Group: 3

Verdict: WRONG ANSWER

Test 13

Group: 3

Verdict: WRONG ANSWER

Test 14

Group: 3

Verdict: WRONG ANSWER

Test 15

Group: 3

Verdict: ACCEPTED

Test 16

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 17

Group: 3

Verdict: TIME LIMIT EXCEEDED