Package g0401_0500.s0496_next_greater_element_i

Class Solution

  • All Implemented Interfaces:
    
public final class Solution

    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,<ins>4</ins>,2. There is no next greater element, so the answer is -1.

    • 1 is underlined in nums2 = <ins>1</ins>,3,4,2. The next greater element is 3.

    • 2 is underlined in nums2 = 1,3,4,<ins>2</ins>. 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,<ins>2</ins>,3,4. The next greater element is 3.

    • 4 is underlined in nums2 = 1,2,3,<ins>4</ins>. There is no next greater element, so the answer is -1.

    Constraints:

    • 1 &lt;= nums1.length &lt;= nums2.length &lt;= 1000

    • <code>0 <= nums1i, nums2i<= 10<sup>4</sup></code>

    • 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?

    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class Description

    • Field Summary

      Fields 
      Modifier and Type Field Description

    • Constructor Summary

      Constructors 
      Constructor Description
      Solution()

    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description

    • Method Summary

      Modifier and Type Method Description
      final IntArray nextGreaterElement(IntArray nums1, IntArray nums2)

      • Methods inherited from class java.lang.Object

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