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Random
Hot problems
IOI '94 P1 - The Triangle
IOI '14 P3 - Game
Longest Increasing Subsequence
CCC '24 J4 - Troublesome Keys
CCC '11 S1 - English or French?
CCCHK '15 J3 - Queens can't attack me!
CCC '24 J3 - Bronze Count
Problem
Category
Points ▾
AC %
Users
Subway Routes
Uncategorized
12p
49.4%
122
Dynamic Range Minimum Test
Uncategorized
12
30.2%
415
Checkerboard Summation (Easy)
Uncategorized
12p
26.1%
278
COCI '09 Contest 7 #4 Svemir
COCI
12p
38.9%
114
Baltic OI '05 P3 - Maze
Baltic OI
12
43.3%
33
Baltic OI '05 P4 - Ancient Manuscript
Baltic OI
12
33.3%
20
Balkan OI '11 P3 - Medians
Balkan OI
12p
27.6%
37
Another Contest 7 Problem 4 - Team Assignments
ACC
12p
20.0%
31
IOI '16 P1 - Detecting Molecules (Standard I/O)
IOI
12p
14.1%
230
Andrew Needs Help
Uncategorized
12p
26.2%
29
CPC '21 Contest 1 P4 - AQT and Directed Graph
Uncategorized
12p
30.1%
252
James' XOR Update
Uncategorized
12p
28.2%
31
Appleby Contest '20 P4 - Philosophy Class
Uncategorized
12p
15.4%
86
Wesley's Anger Contest 6 Problem 4 - Runway Lights
WAC
12p
14.0%
87
COCI '20 Contest 2 #4 Sjekira
COCI
12p
39.6%
63
Riolku's Mock CCC S3 - Mosey's Birthday
Mock CCC
12p
11.7%
63
Riolku's Mock CCC S4 - Clumsy Cindy
Mock CCC
12p
10.7%
70
DMOPC '20 Contest 3 P3 - A Ring of Buckets
DMOPC
12p
7.0%
60
Mock CCC '21 S4 - Infinite Molecule
Mock CCC
12p
8.2%
29
JOI '16 Final P2 - Semiexpress
JOI
12
54.8%
17
Riolku's Mock CCC S2 - Keen Keener Sequence (Hard Version)
Mock CCC
12
10.7%
17
CCC '21 S4 - Daily Commute
CCC
12p
26.1%
583
Segment Tree Practice 1
Uncategorized
12
34.7%
48
Segment Tree Practice 2
Uncategorized
12
43.9%
29
COCI '10 Contest 2 #6 Crni
COCI
12p
53.8%
6
Bruce's Brittle Bridges
Uncategorized
12p
31.6%
70
COCI '11 Contest 1 #5 Sort
COCI
12p
36.2%
30
COCI '10 Contest 3 #5 Diferencija
COCI
12p
47.7%
129
COCI '11 Contest 1 #6 Skakac
COCI
12p
31.6%
5
COCI '10 Contest 3 #6 Mono
COCI
12p
66.7%
6
COCI '10 Contest 4 #5 Dugovi
COCI
12p
36.0%
20
COCI '16 Contest 3 #4 Kvalitetni
COCI
12p
58.8%
8
COCI '16 Contest 4 #4 Rekonstruiraj
COCI
12p
10.7%
12
COCI '16 Contest 5 #4 Ronald
COCI
12p
43.4%
28
COCI '11 Contest 3 #5 Plaće
COCI
12p
28.2%
26
DMOPC '20 Contest 4 P3 - Roving Roombas
DMOPC
12p
19.7%
180
COCI '13 Contest 3 #5 Parovi
COCI
12p
46.7%
16
COCI '10 Contest 5 #5 Dvoniz
COCI
12p
25.5%
64
COCI '13 Contest 4 #4 Guma
COCI
12p
32.6%
25
COCI '13 Contest 5 #4 Domine
COCI
12p
21.1%
40
COCI '13 Contest 6 #4 Kružnice
COCI
12p
46.2%
14
COCI '10 Contest 7 #4 Poštar
COCI
12p
32.0%
55
COCI '10 Contest 7 #5 Kuglice
COCI
12p
35.2%
42
COCI '12 Contest 1 #5 Snaga
COCI
12p
22.3%
20
COCI '11 Contest 6 #5 Pastele
COCI
12p
26.0%
22
COCI '17 Contest 3 #3 Retro
COCI
12p
11.9%
7
COCI '17 Contest 3 #4 Portal
COCI
12p
53.4%
16
COCI '12 Contest 6 #4 Burek
COCI
12p
30.2%
17
COCI '12 Contest 4 #4 Razlika
COCI
12p
39.4%
22
COCI '17 Contest 5 #3 Birokracija
COCI
12p
52.3%
28
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