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Grokking the Coding Interview Patterns

Solution: Next Greater Element I

Explore how to solve the Next Greater Element I problem by using a stack and hash map to efficiently find the next greater element for each value in nums1 from nums2. Understand both naive and optimized approaches, their time and space complexities, and implement the monotonic stack technique for optimal performance.

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Statement

Given the two distinct integer arrays, nums1 and nums2, where nums1 is a subset of nums2, find all the next greater elements for nums1 values in the corresponding places of nums2.

In general, the next greater element of an element, xx, in an array is the first greater element present on the right side of xx in the same array. However, in the context of this problem, for each element xx in nums1, find the next greater element present on the right side of xx in nums2 and store it in the ans array. If there is no such element, store ...