Problems
Encrypted SMS#6907
Very easy · Strings
Hopeless Coach#6908
Medium · Dynamic programming · Probabilities
Yungom#6909
Very easy · Greedy algorithms · Priority Queue
New Island#6910
Very easy · Graphs · Greedy algorithms
Subdictionary#6911
Very easy · Graphs
Sharif Super Computer#6912
Very hard · Graphs · Greedy algorithms
Circle Artwork#6913
Medium · Geometry
Crazy Bits#6914
Very hard · Graphs
Nurikabe#6915
Hard · Depth-first Search · Graphs
Caper pizza#6916
Hard · Geometry · Sorting · Two pointers
Grasshopper#6917
Medium · Breadth-first Search · Graphs
Party Night#6918
Very easy · Graphs
Pachinko#6919
Very hard · Geometry · Graphs
Lexicographical ranking#6920
Hard · Combinatorics · Math · Sorting
Trust groups#6921
Very easy · Graphs
Expensive subway#6922
Very easy · Graphs
Turing#6923
Medium · Implementation
Gnirut#6924
Very hard · Implementation
Contract Revision#6925
Very easy · Strings
Sticker Collector Robot#6926
Easy · Implementation
Account Book#6927
Very easy · Math
Route Change#6928
Medium · Shortest paths · Graphs · Greedy algorithms
Elevator#6929
Very easy · Geometry
Formula 1#6930
Easy · Sorting
Star War#6931
Very easy · Geometry