المسائل
Automatic Input Verifier#1919
صعب جدًا · Implementation
Friendly Points#1920
سهل · Geometry · Sorting · Binary Search
Expanding Lake#1921
صعب جدًا · Geometry
Octahedron And Dominoes#1922
سهل · Dynamic programming
Tiny Puzzle#1923
صعب جدًا · Brute force · Graphs
Circular Island#1924
صعب جدًا · Geometry
Traffic Jam#1925
صعب جدًا · Dynamic programming · Shortest paths
Number of Permutations#1926
سهل جدًا · Dynamic programming · Math
Perspective#1927
سهل جدًا · Graphs
Enjoy Arithmetic Progressions#1928
صعب جدًا · Dynamic programming
Completely Non-zero Determinant#1929
سهل · Matrix
Fast Typing#1930
صعب جدًا · Dynamic programming · Probabilities
XYZX 2009#1931
سهل جدًا · Implementation
Greatest Greatest Common Divisor#1932
سهل جدًا · Number theory
Colored Wizards - 2#1933
سهل جدًا · Graphs
Graph of operations#1934
سهل جدًا · 2-SAT
Regular matching#1935
صعب جدًا · Graphs · Graph matchings
Flights#1936
سهل جدًا · Graphs · Shortest paths
Fire safety#1937
سهل جدًا · Graphs
Island Nations#1938
سهل · Graphs · Shortest paths
King#1939
سهل · Graphs
Ice rink#1940
صعب · Brute force · Implementation · Graphs · Depth-first Search
Ancestor#1941
سهل · Trees
Inevitability#1942
سهل جدًا · Graphs
Bridges#1943
سهل جدًا · Graphs