Grokking the Coding Interview: Patterns for Coding Questions
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Next Greater Element (easy)
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Problem Statement

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Problem Statement

Given two integer arrays nums1 and nums2, return an array answer such that answer[i] is the next greater number for every nums1[i] in nums2.

The next greater element for an element x is the first element to the right of x that is greater than x. If there is no greater number, output -1 for that number.

The numbers in nums1 are all present in nums2.

Examples

    • Input: nums1 = [4,2,6], nums2 = [6,2,4,5,3,7]
    • Output: [5,4,7]
    • Explanation: The next greater number for 4 is 5, for 2 is 4, and for 6 is 7 in nums2.
    • Input: nums1 = [9,7,1], nums2 = [1,7,9,5,4,3]
    • Output: [-1,9,7]
    • Explanation: The next greater number for 9 does not exist, for 7 is 9, and for 1 is 7 in nums2.
    • Input: nums1 = [5,12,3], nums2 = [12,3,5,4,10,15]
    • Output: [10,15,5]
    • Explanation: The next greater number for 5 is 10, for 12 is 15, and for 3 is 5 in nums2.

Constraints:

  • 1 <= nums1.length <= nums2.length <= 1000
  • 0 <= nums1[i], nums2[i] <= 10<sup>4</sup>
  • All integers in nums1 and nums2 are unique.
  • All the integers of nums1 also appear in nums2.

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Python3
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Problem Statement

Try it yourself