Problems Archive

Total Indexed
9,503
Curated competitive problems
Active Judges
2 Platforms
CF, AC sync active
Categories
94 Tags
Popular Tags
System Status Live
Syncing
Problems auto-updating hourly
Problem Name & Code Platform Difficulty Category Tags Actions
D - 　
AtCoder N/A
C - 　　
AtCoder N/A
A - 　(Hihumi)
AtCoder N/A
H - 　(Santa Claus' Track)
AtCoder N/A
E - 　(Tree Coloring)
AtCoder N/A
A - ^{-1}
AtCoder Easy (-1045)
C - - Easy
AtCoder N/A
H - - Hard
AtCoder N/A
B - -- - B
AtCoder Easy (822)
Combinatorics / Counting
I - -1, +1
AtCoder Hard (2163)
Sorting & Searching Min Stack, Queue / Monotonic Deque Greedy Algorithms
D - -1+2-1
AtCoder Hard (2300)
Graph Algorithms
D - 、
AtCoder N/A
J - 、
AtCoder N/A
D - 、
AtCoder N/A
H - 、 (I become a tree)
AtCoder N/A
A - 、 Contest 、
AtCoder Easy (185)
H - 、？
AtCoder N/A
B - 、。
AtCoder Easy (361)
I - :
AtCoder N/A
036 - : (Colon)
AtCoder Easy (178)
A - ！
AtCoder N/A
G - ！
AtCoder N/A
H - ！
AtCoder N/A
D - ！
AtCoder N/A
B - ！
AtCoder Medium (1576)