Kattis-Problems/Train.java at master · gsyndromes/Kattis-Problems · GitHub

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import java.util.*;
import java.io.BufferedReader;
import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.StringTokenizer;

public class Train {

    public static void main(String[] args){
        FastIO fio = new FastIO();
        int capacity = fio.nextInt();
        int n = fio.nextInt();
        int onTrain = 0;


        for (int i = 0; i < n; i++) {
            int leftTrain = fio.nextInt();
            int enteredTrain = fio.nextInt();
            int hadToStay = fio.nextInt();
            if ((i == 0) && leftTrain > 0) {
                onTrain = 1;
                    break;
            }
            onTrain += enteredTrain;
            onTrain -= leftTrain;
            if ((hadToStay != 0) && (onTrain != capacity)) {
                onTrain = 1;
                break;
            }
            if (onTrain > capacity) {
                onTrain = 1;
                break;
            }

        }

        if (onTrain == 0) {
            fio.println("possible");
        } else {
            fio.println("impossible");
        }

        fio.close();

    }

}

/**
 * Fast I/O
 * @source https://www.geeksforgeeks.org/fast-io-in-java-in-competitive-programming/
 */
class FastIO extends PrintWriter
{
    BufferedReader br;
    StringTokenizer st;

    public FastIO()
    {
        super(new BufferedOutputStream(System.out));
        br = new BufferedReader(new
                InputStreamReader(System.in));
    }

    String next()
    {
        while (st == null || !st.hasMoreElements())
        {
            try
            {
                st = new StringTokenizer(br.readLine());
            }
            catch (IOException  e)
            {
                e.printStackTrace();
            }
        }
        return st.nextToken();
    }

    int nextInt()
    {
        return Integer.parseInt(next());
    }

    long nextLong()
    {
        return Long.parseLong(next());
    }

    double nextDouble()
    {
        return Double.parseDouble(next());
    }

    String nextLine()
    {
        String str = "";
        try
        {
            str = br.readLine();
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
        return str;
    }
}