/**
 * Refer: 220115.cpp
 *
 * 1345. Jump Game IV
 * Given an array of integers arr, you are initially positioned at the first index of the array.
 * In one step you can jump from index i to index:
 * i + 1 where: i + 1 < arr.length.
 * i - 1 where: i - 1 >= 0.
 * j where: arr[i] == arr[j] and i != j.
 * Return the minimum number of steps to reach the last index of the array.
 * Notice that you can not jump outside of the array at any time.
 */