Master this problem using the Longest Increasing Subsequence (LIS) pattern.
When approaching Number of Longest Increasing Subsequence, look for key problem signals that suggest using the Longest Increasing Subsequence (LIS) pattern. Focus on reducing redundant iterations, maintaining state invariant, and optimizing space-time complexity.
Key Invariant
Maintain optimal range bounds or hash frequency state during traversal.
Expected Complexity
Time: O(N) or O(N log N) | Space: O(1) to O(N)
Study Resource
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