Round 1B: Pony Express

2204 correct small sets and 1113 correct large sets. View problem statement or contest analysis.

Compact solutions

Solved in...

C++ (2405 sets)
Python (429 sets)
Java (279 sets)
C# (66 sets)
Ruby (23 sets)
C (19 sets)
Go (16 sets)
Kotlin (13 sets)
Scala (11 sets)
D (10 sets)
Haskell (10 sets)
Pascal (7 sets)
PHP (4 sets)
Rust (4 sets)
JavaScript (3 sets)
OCaml (3 sets)
Assembly (2 sets)
Lua (2 sets)
Q (2 sets)
Dart (1 set)
Elixir (1 set)
F# (1 set)
Lisp (1 set)
MATLAB (1 set)
Perl (1 set)
Picat (1 set)

Submission Origin

China (317 contestants)
Russia (242 contestants)
United States (180 contestants)
India (150 contestants)
Japan (145 contestants)
Ukraine (64 contestants)
South Korea (63 contestants)
Poland (62 contestants)
Taiwan (60 contestants)
France (56 contestants)
Vietnam (47 contestants)
Brazil (44 contestants)
Canada (42 contestants)
Bangladesh (41 contestants)
Germany (37 contestants)
Singapore (30 contestants)
Belarus (28 contestants)
Thailand (27 contestants)
Hong Kong (26 contestants)
Netherlands (26 contestants)
United Kingdom (26 contestants)
Indonesia (25 contestants)
Israel (24 contestants)
Romania (24 contestants)
Slovakia (23 contestants)
Iran (21 contestants)
Egypt (20 contestants)
Sweden (20 contestants)
Czech Republic (19 contestants)
Hungary (19 contestants)
Italy (19 contestants)
Australia (18 contestants)
Argentina (14 contestants)
Belgium (14 contestants)
Greece (14 contestants)
Kazakhstan (12 contestants)
Spain (12 contestants)
Armenia (10 contestants)
Bulgaria (10 contestants)
Latvia (10 contestants)
Switzerland (10 contestants)
Turkey (10 contestants)
Croatia (9 contestants)
Georgia (9 contestants)
Lithuania (9 contestants)
Philippines (9 contestants)
South Africa (8 contestants)
Finland (7 contestants)
New Zealand (7 contestants)
Slovenia (7 contestants)
Colombia (6 contestants)
Portugal (6 contestants)
? (5 contestants)
Denmark (5 contestants)
Uzbekistan (5 contestants)
Mexico (4 contestants)
Moldova (4 contestants)
Morocco (4 contestants)
Venezuela (4 contestants)
Jordan (3 contestants)
Antarctica (2 contestants)
Estonia (2 contestants)
Iceland (2 contestants)
Lebanon (2 contestants)
Peru (2 contestants)
Serbia (2 contestants)
Austria (1 contestant)
Azerbaijan (1 contestant)
Bolivia (1 contestant)
British Virgin Islands (1 contestant)
Cuba (1 contestant)
Cyprus (1 contestant)
Kyrgyzstan (1 contestant)
Macedonia (1 contestant)
Malaysia (1 contestant)
Mongolia (1 contestant)
Nepal (1 contestant)
Norway (1 contestant)
Panama (1 contestant)
Saudi Arabia (1 contestant)
Sri Lanka (1 contestant)
Syria (1 contestant)
Tajikistan (1 contestant)
Turkmenistan (1 contestant)
United Arab Emirates (1 contestant)
Uruguay (1 contestant)