LeetCode | Unique Length 3 Palindromic Subsequences | C++ | Golang | Rust
Автор: AlgorithmsUntilRED
Загружено: 2025-11-20
Просмотров: 40
In this video, I solve the LeetCode problem “Unique Length-3 Palindromic Subsequences” using C++, Rust, and Go (Golang).
This problem asks us to count the number of distinct palindromic subsequences of length 3 (pattern: a _ a).
I explain the full logic, optimized approach, and language-specific implementations.
⏱ Timestamps
00:00 – Problem Breakdown & Logic
12:07 – Dry Run of Algorithm
21:03 – Faster lookup logic
23:03 – C++ Implementation
27:04 – Golang Implementation
33:09 – Rust Implementation
You’ll learn:
How palindromic subsequences of form x_y_x work
Frequency-based counting strategy
Set-based uniqueness logic
Optimized linear-time O(N) solution
Implementations in C++, Rust, and Go
Perfect for anyone preparing for coding interviews or improving problem-solving skills.
⚠ Quick correction: @40:55
I accidentally said 576 instead of 676 (26×26).
This is what happens when you solve LeetCode before breakfast 😭☕
Space complexity is still O(1)!
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