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Random
Hot problems
CCC '24 J4 - Troublesome Keys
CCC '24 S2 - Heavy-Light Composition
COCI '22 Contest 4 #1 7Krokods
CCC '24 J5 - Harvest Waterloo
CCC '19 J3 - Cold Compress
CCC '08 S4 - Twenty-four
CCC '24 S3 - Swipe
Problem
Category
Points
AC %
Users ▴
Calendar Contest Problem 5 — Reign of Terror
Uncategorized
15
3.3%
2
Calendar Contest Problem 6 — Ming Dynasty
Seasonal
25
3.5%
2
Dream and the Multiverse
Uncategorized
50p
5.2%
2
DMOPC '21 Contest 5 P5 - Permutations & Primes (Hard Version)
DMOPC
40p
1.5%
2
COI '17 #4 Zagonetka
COCI
17p
4.4%
2
COI '16 #2 Raspad
COCI
30p
66.7%
2
COI '11 #3 Setnja
COCI
25p
50.0%
2
COI '14 #3 Ogledala
COCI
30p
22.2%
2
NOI '22 Multi-Provincial Team Selection P6 - MIS
China NOI
40p
8.3%
2
CEOI '22 P4 - Drawing
CEOI
35p
0.9%
2
JOI '19 Open P3 - Virus Experiment
JOI
35p
5.7%
2
Baltic OI '03 P3 - Table
Baltic OI
10p
9.1%
2
NOI '16 P6 - Computation
China NOI
30p
1.6%
2
NOI '22 P2 - Stone
China NOI
30p
25.0%
2
Non-constructive Constant Time Algorithm
Fun Math
20
9.1%
2
NOIP '20 P4 - WeRun
China NOI
20p
5.0%
2
NOIP '07 P4 - Core of a Tree Net
China NOI
17p
10.3%
2
Google Code Jam '22 Qualification Round Problem E - Twisty Little Passages
Google Code Jam
20p
60.0%
2
Google Code Jam '08 Round 1A Problem B - Milkshakes
Google Code Jam
7p
66.7%
2
Google Code Jam '10 Qualification Round Problem A - Fair Warning
Google Code Jam
7p
50.0%
2
Google Code Jam '11 Qualification Round Problem D - GoroSort
Google Code Jam
15p
33.3%
2
Google Code Jam '11 Round 1A Problem B - The Killer Word
Google Code Jam
12p
22.2%
2
Google Code Jam '12 Qualification Round Problem C - Recycled Numbers
Google Code Jam
5p
40.0%
2
Google Code Jam '12 Round 1A Problem A - Password Problem
Google Code Jam
5p
71.4%
2
Google Code Jam '12 Round 1A Problem B - Kingdom Rush
Google Code Jam
7p
22.2%
2
Google Code Jam '13 Round 1A Problem B - Manage your Energy
Google Code Jam
7p
11.1%
2
Google Code Jam '13 Qualification Round Problem B - Lawnmower
Google Code Jam
7p
50.0%
2
Google Code Jam '13 Qualification Round Problem D - Fair and Square
Google Code Jam
12p
20.0%
2
Google Code Jam '14 Qualification Round Problem C - Deceitful War
Google Code Jam
10p
40.0%
2
Google Code Jam '14 Round 1A Problem A - Charging Chaos
Google Code Jam
7p
66.7%
2
Google Code Jam '15 Qualification Round Problem B - Infinite House of Pancakes
Google Code Jam
5p
12.5%
2
Google Code Jam '15 Round 1A Problem B - Haircut
Google Code Jam
7p
25.0%
2
Google Code Jam '16 Qualification Round Problem B - Revenge of the Pancakes
Google Code Jam
5p
66.7%
2
Google Code Jam '16 Round 1A Problem B - Rank and File
Google Code Jam
7p
66.7%
2
Google Code Jam '16 Round 1A Problem C - BFFs
Google Code Jam
10p
66.7%
2
Google Code Jam '17 Qualification Round Problem C - Bathroom Stalls
Google Code Jam
10p
66.7%
2
Another Contest 10 Problem 3 - Wesley's Anger Contest 7 Problem 3 - The Obligatory Rage Tree Problem
ACC
15p
1.1%
2
다른 콘테스트 10 문제 4 - 웨슬리의 분노 대결 7 문제 4 - 이 문제는 의도적으로 비워 둡니다
ACC
0p
0.6%
2
The Contest Contest 1 P6 - A Typical DMOPC Problem
Uncategorized
30p
1.0%
2
NOI '17 P6 - Magic
China NOI
40p
40.0%
2
NOI '23 P3 - Depth First Search
China NOI
35p
37.5%
2
IOI '23 P6 - Robot Contest
IOI
40p
3.4%
2
Triangles
Uncategorized
30p
40.0%
2
CCO '07 P4 - Gerrymandering
CCO
20p
1.7%
3
CCO Preparation Test 7 P1 - Game of Stone
Mock CCO
20p
6.4%
3
HCI '16 - Computation
Uncategorized
0
4.2%
3
IOIQR P5 - Some Game
Seasonal
25
3.5%
3
Bubble Cup V8 E Spectator Riots
Bubble Cup
25
13.0%
3
Bubble Cup V9 F Pokermon League challenge
Bubble Cup
20
24.3%
3
Bubble Cup V9 I R3D3's summer adventure
Bubble Cup
25
14.0%
3
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