Package g2401_2500.s2420_find_all_good_indices

Class Solution

java.lang.Object
g2401_2500.s2420_find_all_good_indices.Solution
public class Solution extends java.lang.Object
2420 - Find All Good Indices.

Medium

You are given a 0-indexed integer array nums of size n and a positive integer k.

We call an index i in the range k <= i < n - k good if the following conditions are satisfied:

  • The k elements that are just before the index i are in non-increasing order.
  • The k elements that are just after the index i are in non-decreasing order.

Return an array of all good indices sorted in increasing order.

Example 1:

Input: nums = [2,1,1,1,3,4,1], k = 2

Output: [2,3]

Explanation: There are two good indices in the array:

  • Index 2. The subarray [2,1] is in non-increasing order, and the subarray [1,3] is in non-decreasing order.

  • Index 3. The subarray [1,1] is in non-increasing order, and the subarray [3,4] is in non-decreasing order.

Note that the index 4 is not good because [4,1] is not non-decreasing.

Example 2:

Input: nums = [2,1,1,2], k = 2

Output: []

Explanation: There are no good indices in this array.

Constraints:

  • n == nums.length
  • 3 <= n <= 105
  • 1 <= nums[i] <= 106
  • 1 <= k <= n / 2

  • Constructor Summary

    Constructors
    Constructor
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    java.util.List<java.lang.Integer>
    goodIndices(int[] nums, int k)
     

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • goodIndices

      public java.util.List<java.lang.Integer> goodIndices(int[] nums, int k)