Day47.java

/*Value equal to index value
Given an array arr. Your task is to find the elements whose value is equal to that of its index value ( Consider 1-based indexing ).

Note: There can be more than one element in the array which have the same value as its index. You need to include every such element's index. Follows 1-based indexing of the array.

Examples:

Input: arr[] = [15, 2, 45, 4 , 7]
Output: [2, 4]
Explanation: Here, arr[2] = 2 exists here and arr[4] = 4 exists here.
Input: arr[] = [1]
Output: [1]
Explanation: Here arr[1] = 1 exists.
 */
/* import java.util.*;

class Solution {
    public List<Integer> valueEqualToIndex(List<Integer> nums) {
        List<Integer> result = new ArrayList<>();

        for (int i = 0; i < nums.size(); i++) {
            if (nums.get(i) == i + 1) {
                result.add(i + 1); // 1-based index
            }
        }

        return result;
    }
}
*/
/* ⏱ Complexity

Time: O(n)

Space: O(1) (excluding output list)*/