using System;

using System.Linq;

public class Program {

  private static (int leftIndex, int rightIndex) Solve(int[] array) {

    if (array is null || array.Length <= 0)

      return (-1, -1);

​

    int minIndex = 0;

    int min = array[minIndex];

    int maxIndex = array.Length - 1;

    int max = array[minIndex];

​

    for (int i = 0; i < array.Length; ++i) {

      // Note `<` 

      if (array[i] < min) {

        min = array[i];

        minIndex = i;

      }

​

      // Note `>=`

      if (array[i] >= max) {

        max = array[i];

        maxIndex = i;      

      }

    }

​

    return (maxIndex + 1, minIndex + 1);      

  }

​

  public static void Main() {

    //TODO: Add more tests here   

    int[][] tests = new int[][] {

        new [] {1, 2, 1, 3, 1, 3},

        new [] {2, 1, 0, -1},

    };

    var report = string.Join(Environment.NewLine, tests

      .Select(test => (test, solution : Solve(test)))

      .Select(pair => $"[{string.Join(", ", pair.test)}] => {pair.solution.leftIndex} {pair.solution.rightIndex}"));

    Console.Write(report);  

  }

}