Problems
Polar rectangles#3148
Very hard · Geometry
Tetris#3149
Very hard · Implementation
Equation#3150
Easy · Strings · Brute force
Jupiterian Jewelers#3151
Hard · Geometry · Greedy algorithms · Shortest paths
Coin Collectors#3152
Medium · Graphs · Combinatorics
Ancient Calendar#3156
Hard · Number theory · Constructive Algorithms
Deques on 6 Megabytes#3161
Very easy · Data Structures · Implementation
Graph#3162
Hard · Combinatorics · Graphs
Graph Coloring#3163
Easy · Graphs
Bicoloring#3165
Medium · Graphs · Depth-first Search · Breadth-first Search
Asteroids collision#3166
Medium · Geometry
Most distant points pair#3167
Easy · Geometry
Minimum Area Bounding Box#3168
Hard · Geometry
Burn after reading#3169
Hard · Geometry
Clear after burning#3170
Hard · Geometry
Point within a circle#3171
Easy · Geometry
Tower Game Easy#3172
Hard · Games
Tower Game (Hard)#3173
Hard · Games · Dynamic programming
North East King#3174
Very easy · Dynamic programming
Upper Right King (Hard)#3175
Medium · Dynamic programming
Deal or No Deal#3176
Hard · Dynamic programming · Bitmasks · Probabilities · Greedy algorithms · Math
UFO#3177
Very easy · Geometry
Mind Swap Problem#3178
Very hard · Graphs · Brute force
Four Chips (Easy)#3179
Easy · Brute force
Four Chips (Hard)#3180
Hard · Dynamic programming