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

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

public class Teque {

    public static void main(String[] args) {
        FastIO fio = new FastIO();
        int n = fio.nextInt();
        int[] a = new int[500000];
        int[] b = new int[500000];
        int aHead = 0;
        int bHead = 0;
        int aTail = 0;
        int bTail = 0;
        int aSize = 0;
        int bSize = 0;

        for (int i = 0; i < n; i++ ) {
            String method = fio.next();
            int x = fio.nextInt();

            if (method.equals("push_back")) {
            //    if (bHead == bTail && bHead == 0) {
            //         b[bHead] = x;
            //         bTail = (bTail + 1) % 500000;
            //         bSize = bSize + 1;
            //    } else {
                b[bTail] = x;
                bTail = (bTail + 1) % 500000;
                bSize = bSize + 1;
                    if ( bSize - aSize > 0) {
                        bSize = bSize - 1;
                        aSize = aSize + 1;
                        a[aTail] = b[bHead];
                        bHead = (bHead + 1) % 500000;
                        aTail = (aTail + 1) % 500000;

                     }
//               }

            } else if (method.equals("push_front")) {
                // if (aHead == aTail && aHead == 0) {
                //   a[aHead] = x;
                //     aTail = aTail + 1 % 500000;
                //     aSize = aSize + 1;
                // } else {
                aHead = (aHead - 1 + 500000) % 500000;
                a[aHead] = x;
                aSize = aSize + 1;
                if (aSize - bSize > 1) {
                    aSize = aSize - 1;
                    bSize = bSize + 1;
                    bHead = (bHead - 1 + 500000) % 500000;
                    b[bHead] = a[(aTail - 1 + 500000) % 500000];
                    aTail = (aTail - 1 + 500000) % 500000;
                }

              //   }
            } else if (method.equals("push_middle")) {

                if (aSize <= bSize) {
                    a[aTail] = x;
                    aTail = (aTail + 1) % 500000;
                    aSize = aSize + 1;

                } else {

                    bHead = (bHead - 1 + 500000) % 500000;
                    b[bHead] = x;
                    bSize = bSize + 1;

                }

            } else if (method.equals("get")) {
                    if (x < aSize) {
                        fio.println(a[(aHead + x) % 500000]);
                    } else {
                       fio.println(b[(bHead + (x - aSize)) % 500000]);

                    }
            } else {
                fio.println("Error in method");
            }
        }

    //   for (int i = 0; i < a.length ; i ++) {
    //        if ( a[i] != 0) {
    //             fio.println("this is in a :" + a[i] +" at index "+i+ " aHead is at " +aHead+" aTail is at " +aTail);
    //         }
    //         if (b[i] != 0) {
    //             fio.println("this is in b :" + b[i]+" at index "+i+" bHead is at " +bHead+" bTail is at " + bTail);
    //        }
    //     }

        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;
    }
}