SWE Foundations
The core coding-round ramp: pointers and sweeps up through graphs, in the order the patterns build on each other.
1easySign in to star problems
Algorithms & Data Structures · The two-pointer warm-up: one pointer at each end.
2mediumSign in to star problems
Algorithms & Data Structures · Sort, then sweep — the pattern behind a dozen calendar problems.
3mediumSign in to star problems
Algorithms & Data Structures · Hash map plus doubly linked list, all operations O(1).
4mediumSign in to star problems
Algorithms & Data Structures · Cycle detection dressed up as a scheduling question.
5