Post Leetcode Question Numbers that taught you Techniques.
I'll start with a few, per topic. [Updated based in responses due to request] Sliding Window: 76, 159 Two Pointer: 11, 15 Binary Search: 4, 33, 69, 938 Backtracking: 22, 17 DP: 198, 10, 72, 741, 121, 123, 188 Greedy: 122, 420 Graph: 721, 737 Union Fold: 305