DSA
Stacks & Queues. Space O(n).
Solution - Monotonic Stack approach. Optimal — Time O(2n), Space O(n).
Covers: Brute Force, Using Stack, Optimal. Optimal — Time O(n), Space O(n).
Covers: Stack, Deque. Optimal — Time O(n), Space O(n).
Stacks & Queues problem — solution with code and analysis.
Covers: Naive, Better. Optimal — Time O(n), Space O(n-k).
Better approach. Optimal — Time O(n), Space O(1).
Stacks & Queues. Time O(1).
4 approaches incl. BRUTE FORCE, DP, TWO POINTER, and more.
Solution - 2 Stacks approach. Optimal — Time O(n), Space O(n).
Solution - Monotonic Stack approach. Optimal — Time O(n), Space O(n).
Design. Time O(1).
Graphs. Time O(V^2).