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