Problems
Symmetry 2#251
Hard · Geometry
Not Everything Short is Simple#252
Medium · Math
Watermelon Festival#253
Hard · Implementation · Math
Mars Kingdom#254
Very easy · Dynamic programming
License Software#255
Very easy · Math
Continued fraction#256
Very easy · Implementation · Math
Gambling#257
Very easy · Brute force · String suffix structures
Box of Chocolates#258
Easy · Dynamic programming · Sorting · Math
Genetic Engineering#259
Very easy · Binary Search
Pumpkin porridge#260
Very easy · Sorting
Aliquot Fractions#261
Hard · Dynamic programming
The staircase#262
Very easy · Dynamic programming
Three ones#263
Very easy · Dynamic programming
The longest divisible subsequence#264
Easy · Bitsets
Vertex Cover#265
Easy · Graphs
Comparison#266
Very easy · Implementation
Subtraction#267
Very easy · Implementation
Star Routes#268
Very easy · Graphs
Four Circles#269
Very easy · Geometry
CheckSum#270
Easy · Hashing
Factorial!#271
Easy · Math
Multiplication#272
Easy · Math
Modular Exponentiation#273
Very easy · Math
Type printer#274
Medium · Greedy algorithms · Strings
Islands#275
Hard · Dynamic programming · Graphs