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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
CCO '04 P5 - Jengaism
CCO
7
31.8%
116
CCOQR '16 - Stupendous Bowties
CCC
10p
31.8%
242
CCO '04 P6 - Orko
CCO
15
31.6%
42
CCO '10 P5 - Space Miner
CCO
15
31.5%
52
CCO '08 P4 - Herding
CCO
10p
31.3%
220
CCO '08 P3 - Mobile
CCO
17p
31.3%
46
CCO '19 P1 - Human Error
CCO
10p
31.2%
87
CCO '08 P1 - Moving Day
CCO
7p
30.5%
106
CCO '02 P5 - Connect The Campus
CCO
12
30.4%
100
CCO '07 P6 - Road Construction
CCO
20p
30.1%
177
CCO '10 P2 - Tree Pruning
CCO
15
29.6%
184
CCO '20 P2 - Exercise Deadlines
CCO
15p
29.6%
286
Mock CCO '18 Contest 3 Problem 2 - Roger Delegates Work to Jessica
Mock CCO
20p
28.9%
23
CCO '99 P3 - Manelzuma's Revenge
CCO
10
28.6%
2
Mock CCO '18 Contest 2 Problem 2 - Victor Rains
Mock CCO
20p
27.7%
21
CCO '11 P1 - Putnam
CCO
7
27.6%
108
CCO '99 P1 - You Can't Get There From Here
CCO
7
27.5%
16
CCO '22 P1 - Alternating Heights
CCO
12p
27.2%
131
Mock CCO '19 Contest 1 Problem 6 - A Geometry Problem
Mock CCO
15p
27.2%
16
Mock CCO '18 Contest 4 Problem 4 - Time Travel
Mock CCO
15p
27.0%
53
CCO '19 P5 - Marshmallow Molecules
CCO
15p
26.9%
126
CCO '96 P1 - Train Swapping
CCO
5
26.8%
211
CCO Preparation Test 5 P1 - City Game
Mock CCO
15
26.4%
202
CCO '98 P1 - Fibonacci Numbers
CCO
7
26.3%
156
Mock CCO '17 Problem 2 - Penetrating Power
Mock CCO
17p
25.5%
168
CCO '03 P1 - BFed
CCO
10
25.4%
61
Mock CCO '17 Problem 1 - Fast Fuhrer Transform
Mock CCO
10p
25.4%
60
CCO '06 P1 - CN Tower
CCO
5
25.4%
140
CCO '19 P6 - Bad Codes
CCO
20p
25.2%
67
CCO '98 P4 - Scoring Curling
CCO
7p
25.0%
8
Mock CCO '18 Contest 4 Problem 5 - Spawn More Overlords
Mock CCO
20p
24.8%
35
Mock CCO '18 Contest 1 Problem 5 - A Counting Problem
Mock CCO
20p
24.5%
9
CCO '12 P2 - The Hungary Games
CCO
15
24.4%
472
CCO '10 P3 - Wowow
CCO
15p
24.3%
279
CCO Preparation Test 6 P1 - Bus Routes
Mock CCO
20p
24.2%
6
CCO '19 P2 - Sirtet
CCO
20p
24.2%
80
CCO '05 P1 - Number Matrix
CCO
10
24.2%
161
Mock CCO '17 Problem 6 - Dire Consequences
Mock CCO
20
24.2%
25
Mock CCO '18 Contest 4 Problem 3 - Counterattack
Mock CCO
15p
24.1%
275
CCO '12 P5 - Sample Size
CCO
7
24.1%
171
CCO '13 P4 - A Romantic Movie Outing
CCO
20p
23.9%
91
CCO '23 P1 - Binaria
CCO
12p
23.8%
161
CCO '14 P5 - Early Exam Evacuation
CCO
20p
23.2%
86
CCO Preparation Test 6 P3 - HopScotch
Mock CCO
20p
23.1%
140
CCO '13 P3 - LHC
CCO
12p
23.1%
396
CCO '21 P5 - Bread First Search
CCO
20p
23.0%
62
CCO '98 P5 - Text Segmentation
CCO
10
22.8%
17
CCO '12 P1 - Choose Your Own Arithmetic
CCO
7
22.8%
223
CCO '11 P3 - Spies Like Us
CCO
10p
22.8%
202
CCO Preparation Test 4 P3 - Dynamic MST
Mock CCO
25p
22.4%
49
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