Problems
Decree of the Wise Leader#4403
Easy · Implementation
Quite a problem#4404
Very easy · Implementation
Multi-touch gesture classification#4405
Very hard · Geometry
Stacking Curvy Blocks#4406
Medium · Math · Optimization
Unicycle counting#4407
Hard · Dynamic programming · Bitmasks
Choosing Numbers#4408
Very hard · Math · Number theory
Loopy transit#4409
Medium · Depth-first Search · Graphs · Brute force
Hitting the Targets#4410
Very easy · Geometry
Texas Summers#4411
Medium · Dijkstra algorithm · Shortest paths · Graphs
Out of context#4412
Hard · Dynamic programming · Strings
Maze movement#4413
Very hard · Graphs
Ragged Right#4414
Very easy · Implementation
Testing System#4416
Very easy · Sorting
Number#4417
Very easy · Sorting
Lexicographical order#4418
Medium · Math
Dense forest#4419
Very easy · Binary Search
The root of a cubic equation#4420
Very easy · Binary Search
For fans of statistics#4421
Easy · Binary Search
Trains#4422
Medium · Binary Search · Implementation
Transfer points#4423
Very easy · Implementation
Union of segments#4424
Very easy · Sorting
Further solving#4425
Very easy · Sorting · Prefix Sums
Minimum Coverage#4426
Easy · Greedy algorithms
Chinese clock#4427
Medium · Implementation · Greedy algorithms
Intersection of Rectangles#4428
Very easy · Implementation