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Tier I · Fundamentals

Hash Maps0/9
Stacks & Queues0/8
Two Pointers0/8
Sliding Window0/10
Binary Search0/9

Tier II · Intermediate

Prefix Sums0/7
Math & Number Theory0/7
Merge Intervals0/5
Greedy0/8
Depth-First Search I0/3
Breadth-First Search I0/3
Depth-First Search II0/3
Breadth-First Search II0/5
Heaps & Priority Queues0/8
Backtracking0/7
Kadane's Algorithm0/4
Bit Manipulation0/6
Topological Sort0/6
Tries0/5
1D Linear DP0/2

Tier III · Advanced

Monotonic Stack0/9
Knapsack0/6
State Machine DP0/3
Grid DP0/3
Two-Sequence DP0/2
Longest Increasing Subsequence0/2
Tree DP0/4
Union-Find0/4
Bipartite Graphs0/3
Line Sweep0/6
Shortest Paths0/4

Tier IV · Mastery

Interval DP0/2
Bitmask DP0/1
Digit DP0/1
Segment Trees0/1
String Matching0/1

Kadane's Algorithm

Tier II · Intermediate

Best-subarray running state — the classic gateway to dynamic programming.

0 / 4 clearedCore×1Bronze×1Silver×2

Recommended first: Prefix Sums.

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Problems4

1
Maximum SubarrayCore
2
Maximum RiseBronze
3
Maximum Subarray ProductSilver
4
Maximum Subarray Sum With Endpoint DifferenceSilver

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