RB Sheet for DSA Mastery

DSA Sheets

Learn reusable patterns, not random problems. Track your solved count as you go.

The complete pattern-wise roadmap.

Two Pointers

1/4

Converge from both ends to hit O(n) on sorted-ish data.

  • Two Sum II
    Easy
  • Container With Most Water
    Medium
  • 3Sum
    Medium
  • Trapping Rain Water
    Hard

Sliding Window

1/3

Maintain a moving range to track running subarray state.

  • Max Subarray Sum K
    Easy
  • Longest Substring No Repeat
    Medium
  • Minimum Window Substring
    Hard

Prefix Sum

0/2

Precompute cumulative sums for O(1) range queries.

  • Subarray Sum Equals K
    Medium
  • Range Sum Query
    Easy