Most popular
Data Structures & Algorithms
The round that decides everything
Pattern-first DSA with optimal time/space solutions in C++, Java & Python. Two tracks: placd 100 (a core set) and Blind 75 (fundamentals).
- placd 100
- Blind 75
- Patterns, not rote
- Editorial solutions
- Progress tracking
Sample questions
- EasyTwo SumArrays & Hashing
- MediumLongest Substring Without RepeatingSliding Window
- HardMerge K Sorted ListsHeaps
- MediumNumber of IslandsGraphs
- HardTrapping Rain WaterTwo Pointers
Master DSA, pattern by pattern
20 categories, 2,700+ problems with optimal editorial solutions in C++, Java & Python. Start with placd 100 or Blind 75.
Core data structures
Arrays & Hashing
300 problems
Linked Lists
43 problems
Trees
111 problems
Stacks
77 problems
Queues
25 problems
Heaps
64 problems
Algorithm patterns
Two Pointers
30 problems
Sliding Window
52 problems
Binary Search
30 problems
Dynamic Programming
122 problems
Greedy
51 problems
Sorting & Searching
87 problems
Advanced topics
Graphs
156 problems
Tries
33 problems
Matrix
68 problems
Bit Manipulation
45 problems
Intervals
16 problems
Math & Geometry
77 problems