How to Actually Get Good at LeetCode (Without Grinding 500 Problems)
Volume is the trap. The people who pass interviews practice fewer problems, deliberately — spaced, varied, and graded. Here's the system.
Everyone's seen the advice: "just do 500 problems." Most people who follow it burn out at 80 and remember none of them. The ones who pass do something different — they practice deliberately.
Why raw volume fails
- You repeat what you're already good at (it feels productive; it isn't)
- You read the solution after five minutes and confuse recognition for recall
- You never revisit, so it fades
The system that works
1. Pattern over problems. There are ~15 patterns (two pointers, sliding window, BFS/DFS, binary search, DP, monotonic stack…). Learn the pattern, then do 3–4 varied problems on it. You're not collecting problems; you're collecting transferable moves.
2. Struggle first, then grade. Give yourself an honest attempt before looking. The struggle is where the learning is. Then get a real verdict — did it actually pass every hidden test?
3. Space your repetition. Revisit a pattern a few days later from memory. If you can't reproduce it, you didn't learn it yet.
4. Climb difficulty on purpose. Always be a little uncomfortable. A rating system makes this automatic — beat a machine at your level and the next one is harder.
Put it on rails
- Start with a core pattern problem
- Use roadmaps to go pattern-by-pattern
- Mix in concept lessons so you understand why, not just what
Fewer problems, done deliberately, beats 500 done on autopilot. Quality of reps, not quantity.