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g0401_0500.s0496_next_greater_element_i.readme.md Maven / Gradle / Ivy

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?