How to Solve Next Greater Element I Problem
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Next Greater Element I
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, wh...
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Understanding the Next Greater Element I Problem
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Problem Statement
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.
Next Greater Element I
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Examples
nums1 = [4,1,2], nums2 = [1,3,4,2][-1,3,-1]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.
nums1 = [2,4], nums2 = [1,2,3,4][3,-1]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 <= 10000 <= nums1[i], nums2[i] <= 104All 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?How Interview Coder Helps with Leetcode Problems
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