USACO Gold 2020 February - Timeline

C++

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#include <bits/stdc++.h>
typedef long long ll;
using namespace std;

void topo_sorting(vector<vector<pair<int, int>>> &graph, vector<bool> &visited,
                  vector<int> &toposort, int node) {
	visited[node] = true;
	for (auto i : graph[node]) {
		int a, b;
		tie(a, b) = i;

Java

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

public class timeline {
	public static void main(String[] args) throws IOException {
		BufferedReader r = new BufferedReader(new FileReader("timeline.in"));
		PrintWriter pw = new PrintWriter("timeline.out");
		StringTokenizer st = new StringTokenizer(r.readLine());
		int N = Integer.parseInt(st.nextToken());
		int M = Integer.parseInt(st.nextToken());