Submission #74224004

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Source Code Expand

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

public class Main {
    public static void main(String[] args) {
        InputReader reader = new InputReader(System.in);
        PrintWriter writer = new PrintWriter(System.out, false);
        int N = reader.nextInt();
        int M = reader.nextInt();
        int K = reader.nextInt();
        List<List<Integer>> graph = new ArrayList<>(N);
        for (int i = 0; i < N; i++) {
            graph.add(new ArrayList<>());
        }
        for (int i = 0; i < M; i++) {
            int u = reader.nextInt() - 1;
            int v = reader.nextInt() - 1;
            int w = reader.nextInt();
            if (w < K) continue;
            graph.get(u).add(v);
            graph.get(v).add(u);
        }
        int[] dist = new int[N];
        Arrays.fill(dist, -1);
        dist[0] = 0;
        Queue<Integer> queue = new LinkedList<>();
        queue.add(0);
        while (!queue.isEmpty()) {
            int u = queue.remove();
            for (int v : graph.get(u)) {
                if (dist[v] == -1) {
                    dist[v] = dist[u] + 1;
                    queue.add(v);
                }
            }
        }
        writer.println(dist[N - 1]);
        writer.close();
        System.exit(0);
    }
    static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;
        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }
        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }
        public int nextInt() {
            return Integer.parseInt(next());
        }
        public long nextLong() {
            return Long.parseLong(next());
        }
        public double nextDouble() {
            return Double.parseDouble(next());
        }
        public String nextLine() {
            String str = "";
            try {
                str = reader.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    }
}

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