Opposite-Direction (Converging) Problems
59 Opposite-Direction (Converging) problems on LeetCode, a Two Pointers interview pattern, ranked by importance (how often it comes up in real interviews). Difficulty (ELO) and importance shown per problem.
| # | PROBLEM | DIFF | ELO | IMP | PATTERNS |
|---|---|---|---|---|---|
| 1 | Trapping Rain Water | Medium | 1699 | 93 | Monotonic Stack · Prefix Sums |
| 2 | Two Sum II - Input Array Is Sorted | Easy | 1124 | 90 | Complement Search (Two Sum Pattern) |
| 3 | Container With Most Water | Easy | 1374 | 90 | Exchange Argument / Local Adjustment |
| 4 | Valid Palindrome | Easy | 1045 | 85 | |
| 5 | Longest Palindromic Substring | Medium | 1458 | 84 | Word Break / String DP |
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