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Grokking the Coding Interview Patterns in C#

Solution: Number of Longest Increasing Subsequence

Let’s solve the Number of Longest Increasing Subsequence using the Dynamic Programming pattern.

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Statement

Given an integer array nums, return the number of longest strictly increasing subsequences it contains.

A subsequence is formed by choosing elements from the array while keeping their original order, and it is considered strictly increasing if every next element is greater than the previous one.

Constraints:

  • 1≤1 \le nums.length ≤2000\leq 2000

  • −106≤-10^{6} \leq ...