673. Number of Longest Increasing Subsequence LeetCode Solution

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Number of Longest Increasing Subsequence Given an integer array nums, return the number of longest increasing subsequences.

Notice that the sequence has to be strictly increasing.

Example 1:

Input: nums = [1,3,5,4,7]
Output: 2
Explanation: The two longest increasing subsequences are [1, 3, 4, 7] and [1, 3, 5, 7].

Example 2:

Input: nums = [2,2,2,2,2]
Output: 5
Explanation: The length of longest continuous increasing subsequence is 1, and there are 5 subsequences' length is 1, so output 5.

Constraints:

  • 1 <= nums.length <= 2000
  • -106 <= nums[i] <= 106

Number of Longest Increasing Subsequence Solutions

Time: O(n)
Space: O(n)

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