Задачи
Brackets#1994
Лесно · Data Structures
How can I help?#1995
Много трудно · Dynamic programming
Cupcakes#1996
Лесно · Math
Approaching by progression#1997
Много лесно · Math
Tori#1998
Лесно · Geometry
Palindrome#1999
Трудно · Strings
Minefield#2000
Трудно · Greedy algorithms
Device Survey#2001
Много лесно · Binary Search · Graphs
Pattern Coloring#2002
Лесно · Sorting · Prefix Sums
Cellular communication#2003
Трудно · Graphs · Brute force
Routing#2004
Много трудно · Binary Search
Weighing 2#2005
Много трудно · Brute force · Combinatorics · Dynamic programming · Implementation · Graphs
Plus and xor#2006
Лесно · Bitmasks
Gift#2007
Средно · Graphs · Greedy algorithms
Tourist#2008
Средно · Binary Search
Points#2009
Лесно · Math
Mice and Cheese#2010
Лесно · Greedy algorithms · Sorting
Mutation#2011
Средно · Dynamic programming · Implementation
Sequence#2012
Много лесно · Dynamic programming
Area of the hexagon#2013
Много лесно · Geometry
Lucky Number#2014
Много лесно · Implementation
Game XOR#2015
Трудно · Games · Math · Combinatorics
Determinant of the matrix#2017
Лесно · Matrix
Minimal d-exponent#2018
Средно · Number theory · Brute force
Fibonacci sequence#2019
Средно · Hashing · Dynamic programming