package chelper;

import net.egork.chelper.task.Test;
import net.egork.chelper.tester.TestCase;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Random;

public class TaskDTestCase {
  @TestCase
  public Collection<Test> createTests() {
    List<Test> tests = new ArrayList<>();

    tests.add(test1());
    tests.add(test2());
    tests.add(test3());

    return tests;
  }

  private Test test1() {
    StringBuilder in = new StringBuilder();

    int n = 300000;
    int m = 500000;

    in.append(n + " " + m + "\n");

    for (int i = 1; i <= n; i++) {
      in.append(i + " ");
    }
    in.append("\n");

    int im = m;
    for (int i = n; i >= 1; i--) {
      for (int j = i + 1; j <= n && im > 0; j++) {
        in.append(i + " " + j + "\n");
        im--;
      }
    }

    return new Test(in.toString());
  }

  private Test test2() {
    StringBuilder in = new StringBuilder();

    int n = 300000;
    int m = 0;

    in.append(n + " " + m + "\n");

    for (int i = 1; i <= n; i++) {
      in.append(i + " ");
    }
    in.append("\n");

    int im = m;
    for (int i = n; i >= 1; i--) {
      for (int j = i + 1; j <= n && im > 0; j++) {
        in.append(i + " " + j + "\n");
        im--;
      }
    }

    return new Test(in.toString());
  }

  private Test test3() {
    StringBuilder in = new StringBuilder();

    int n = 300000;
    int m = 500000;

    in.append(n + " " + m + "\n");

    for (int i = 1; i <= n; i++) {
      in.append(i + " ");
    }
    in.append("\n");

    int im = m;
    Random random = new Random(0);
    for (int i = m; i >= 1 && im > 0; i--) {
      int l = random.nextInt(n) + 1;
      int r = random.nextInt(n) + 1;
      in.append(l + " " + r + "\n");
      im--;
    }

    return new Test(in.toString());
  }
}