Problems
The same number of divisors#10218
Very easy · Brute force · Implementation
Grandpa Quentin's Game#10219
Medium · Dynamic programming
Divide and conquer#10220
Medium · Games
Rectangles in a Square#10221
Very easy · Geometry
Emma and the Strange Circle#10222
Very hard · Greedy algorithms · String suffix structures
The Settlers of Catan#10223
Medium · Depth-first Search · Graphs · Brute force
Articulation points - Timestamps#10224
Very easy · Graphs
Triangle#10225
Easy · Implementation · Geometry
Social networks#10226
Very easy · Math
Instagram#10227
Easy · Implementation
Perfect Squares#10228
Very hard · Brute force
Electronic clock#10229
Very easy · Implementation
Photo Scaling#10230
Medium · Implementation · Math
Sequence Simplification#10231
Hard · Implementation
Diagonals#10232
Very easy · Prefix Sums
Formulaic expressions#10233
Easy · Implementation
Passing Game#10234
Very easy · Graphs
Ordering tasks#10235
Very easy · Graphs
N Queens - placement#10236
Very easy · Implementation · Brute force
Plant#10237
Medium · Implementation
Knight route#10242
Medium · Depth-first Search · Brute force · Graphs
Book 1#10243
Very easy · Implementation
Increasing sines 1#10244
Easy · Sorting · Dynamic programming
Names and characters#10245
Very easy · Implementation
ICPC Sort#10246
Very easy · Sorting