Package g0401_0500.s0496_next_greater_element_i

Class Solution

java.lang.Object
g0401_0500.s0496_next_greater_element_i.Solution
public class Solution extends java.lang.Object
496 - Next Greater Element I.

Easy

The next greater element of some element x in an array is the first greater element that is to the right of x in the same array.

You are given two distinct 0-indexed integer arrays nums1 and nums2, where nums1 is a subset of nums2.

For each 0 <= i < nums1.length, find the index j such that nums1[i] == nums2[j] and determine the next greater element of nums2[j] in nums2. If there is no next greater element, then the answer for this query is -1.

Return an array ans of length nums1.length such that ans[i] is the next greater element as described above.

Example 1:

Input: nums1 = [4,1,2], nums2 = [1,3,4,2]

Output: [-1,3,-1]

Explanation:

The next greater element for each value of nums1 is as follows:

  • 4 is underlined in nums2 = [1,3,4,2]. There is no next greater element, so the answer is -1.

  • 1 is underlined in nums2 = [1,3,4,2]. The next greater element is 3.

  • 2 is underlined in nums2 = [1,3,4,2]. There is no next greater element, so the answer is -1.

Example 2:

Input: nums1 = [2,4], nums2 = [1,2,3,4]

Output: [3,-1]

Explanation:

The next greater element for each value of nums1 is as follows:

  • 2 is underlined in nums2 = [1,2,3,4]. The next greater element is 3.

  • 4 is underlined in nums2 = [1,2,3,4]. There is no next greater element, so the answer is -1.

Constraints:

  • 1 <= nums1.length <= nums2.length <= 1000
  • 0 <= nums1[i], nums2[i] <= 104
  • All integers in nums1 and nums2 are unique.
  • All the integers of nums1 also appear in nums2.

Follow up: Could you find an O(nums1.length + nums2.length) solution?

  • Constructor Summary

    Constructors
    Constructor
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    int[]
    nextGreaterElement(int[] nums1, int[] nums2)
     

    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

    • nextGreaterElement

      public int[] nextGreaterElement(int[] nums1, int[] nums2)