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refactor 1345
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src/main/java/com/fishercoder/solutions/_1345.java

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import java.util.Map;
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import java.util.Queue;
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/**
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* 1345. Jump Game IV
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*
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* Given an array of integers arr, you are initially positioned at the first index of the array.
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* In one step you can jump from index i to index:
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* i + 1 where: i + 1 < arr.length.
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* i - 1 where: i - 1 >= 0.
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* j where: arr[i] == arr[j] and i != j.
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* Return the minimum number of steps to reach the last index of the array.
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* Notice that you can not jump outside of the array at any time.
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*
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* Example 1:
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* Input: arr = [100,-23,-23,404,100,23,23,23,3,404]
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* Output: 3
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* Explanation: You need three jumps from index 0 --> 4 --> 3 --> 9. Note that index 9 is the last index of the array.
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*
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* Example 2:
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* Input: arr = [7]
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* Output: 0
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* Explanation: Start index is the last index. You don't need to jump.
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*
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* Example 3:
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* Input: arr = [7,6,9,6,9,6,9,7]
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* Output: 1
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* Explanation: You can jump directly from index 0 to index 7 which is last index of the array.
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*
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* Example 4:
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* Input: arr = [6,1,9]
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* Output: 2
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*
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* Example 5:
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* Input: arr = [11,22,7,7,7,7,7,7,7,22,13]
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* Output: 3
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*
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* Constraints:
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* 1 <= arr.length <= 5 * 10^4
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* -10^8 <= arr[i] <= 10^8
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* */
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public class _1345 {
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public static class Solution1 {
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/**credit: https://leetcode.com/problems/jump-game-iv/discuss/502699/JavaC%2B%2B-BFS-Solution-Clean-code-O(N)*/
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/**
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* credit: https://leetcode.com/problems/jump-game-iv/discuss/502699/JavaC%2B%2B-BFS-Solution-Clean-code-O(N)
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*/
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public int minJumps(int[] arr) {
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Map<Integer, List<Integer>> valueToIndices = new HashMap<>();
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for (int i = 0; i < arr.length; i++) {

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