Lennot

import java.util.ArrayList;
import java.util.Comparator;
 
public class Lennot{
    
    static int n;
    static long[] leastPrices;
    static ArrayList<flight>[] connections;
    static ArrayList<flyItem> currentNodes;
    
    public static void main(String[] args){
        IO io = new IO();
        
        n = io.nextInt();
        int m = io.nextInt();
        
        connections = new ArrayList[n];
        leastPrices = new long[n];
        for(int i = 0; i < n; i++){
            connections[i] = new ArrayList();
            leastPrices[i] = Long.MAX_VALUE;
        }
        
        
        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 ArrayList();
        
        flyItem i = new flyItem(0, 0);
        
        while(i.city != n-1 && leastPrices[n-1] > i.price){
            fly(i);
            i = currentNodes.get(0);
            currentNodes.remove(0);
        }
        
        io.println(leastPrices[n-1]);
        io.close();
    }
    
    private static void fly(flyItem i){
        
        for(flight f: connections[i.city]){
            
            long newPrice = i.price + f.price;
            
            if(f.city == n-1){
                leastPrices[n-1] = newPrice;
            }
            
            for(flight f2: connections[f.city]){
                if(leastPrices[f2.city] > newPrice){
                    leastPrices[f2.city] = newPrice;
                    currentNodes.add(new flyItem(f2.city, newPrice));
                    currentNodes.sort(com);
                }
            }
            
            
        }
        
    }
    
    private static compare com = new compare();
    
    private static class compare implements Comparator<flyItem>{
        @Override
        public int compare(flyItem i1, flyItem i2){
            int ans = i1.price.compareTo(i2.price);
            if(ans == 0)
                return 1;
            return ans;
        }
    }
    
    private static class flyItem{
        int city;
        Long price;
        
        public flyItem(int city, long price){
            this.city = city;
            this.price = price;
        }
        
    }
    
    private static class flight{
        int city, price;
        
        public flight(int city, int price){
            this.city = city;
            this.price = price;
        }
    }
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: WRONG ANSWER

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: ACCEPTED

Test 7

Group: 2

Verdict: WRONG ANSWER

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: WRONG ANSWER

Test 10

Group: 2

Verdict: ACCEPTED

Test 11

Group: 3

Verdict: ACCEPTED

Test 12

Group: 3

Verdict: ACCEPTED

Test 13

Group: 3

Verdict: ACCEPTED

Test 14

Group: 3

Verdict: ACCEPTED

Test 15

Group: 3

Verdict: ACCEPTED

Test 16

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 17

Group: 3

Verdict: TIME LIMIT EXCEEDED