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Random
Hot problems
NOI '15 P2 - Software Package Manager
CCC '22 J3 - Harp Tuning
Knapsack 4
ECOO '17 R3 P1 - Baker Brie
CCC '08 S4 - Twenty-four
A Game
DMOPC '19 Contest 7 P5 - Soriya's Programming Project
Problem ▴
Category
Points
AC %
Users
IOI '21 P3 - Fountain Parks
IOI
30p
4.8%
7
IOI '21 P4 - Mutating DNA
IOI
12p
30.3%
73
IOI '21 P5 - Dungeons Game
IOI
30p
8.1%
9
IOI '21 P6 - Bit Shift Registers
IOI
30p
13.8%
8
IOI '22 P1 - Catfish Farm
IOI
25p
8.1%
44
IOI '22 P2 - Prisoner Challenge
IOI
25p
8.2%
25
IOI '22 P3 - Radio Towers
IOI
30p
7.2%
15
IOI '22 P4 - Digital Circuit
IOI
25p
25.2%
25
IOI '22 P5 - Rarest Insects
IOI
30p
5.0%
21
IOI '22 P6 - Thousands Islands
IOI
30p
3.1%
6
IOI '23 P1 - Closing Time
IOI
25p
4.6%
20
IOI '23 P2 - Longest Trip
IOI
25p
3.1%
13
IOI '23 P3 - Soccer Stadium
IOI
30p
4.7%
12
IOI '23 P4 - Beech Tree
IOI
35p
4.9%
3
IOI '23 P5 - Overtaking
IOI
25p
6.1%
11
IOI '23 P6 - Robot Contest
IOI
40p
3.4%
2
IOI '94 P1 - The Triangle
IOI
7p
56.3%
1468
IOI '94 P2 - The Castle
IOI
10
18.8%
127
IOI '94 P4 - The Clocks
IOI
10
27.2%
121
IOI '95 P1 - Packing Rectangles
IOI
15p
45.3%
26
IOI '95 P2 - Shopping Offers
IOI
15p
27.5%
42
IOI '95 P4 - Letter Game
IOI
15p
26.9%
33
IOI '95 P5 - Street Race
IOI
15p
24.1%
39
IOI '95 Practice Task 1 - Fence Factory
IOI
15p
21.7%
10
IOI '95 Practice Task 2 - Word Chains
IOI
12
43.9%
54
IOI '95 Practice Task 3 - Bar Codes
IOI
12p
35.4%
23
IOI '96 P1 - A Game
IOI
10
39.3%
267
IOI '96 P2 - Job Processing
IOI
20p
29.5%
53
IOI '96 P3 - Network of Schools
IOI
12p
23.7%
83
IOI '96 P4 - Sorting a Three-Valued Sequence
IOI
10
31.9%
142
IOI '96 P5 - Longest Prefix
IOI
12
20.8%
112
IOI '97 P1 - Mars Explorer
IOI
20p
12.8%
16
IOI '97 P3 - The Toxic iShongololo
IOI
20p
47.5%
7
IOI '97 P4 - Map Labelling
IOI
20p
53.2%
3
IOI '98 P1 - Contact
IOI
10p
8.9%
58
IOI '98 P2 - Starry Night
IOI
15
41.3%
28
IOI '98 P3 - Party Lamps
IOI
12p
34.0%
168
IOI '98 P4 - Picture
IOI
15p
30.9%
221
IOI '98 P5 - Camelot
IOI
15p
40.6%
51
IOI '98 P6 - Polygon
IOI
15
32.0%
61
IOI '99 P1 - Little Shop of Flowers
IOI
10
30.6%
204
IOI '99 P2 - Hidden Codes
IOI
20p
14.4%
10
IOI '99 P4 - Traffic Lights
IOI
15
31.1%
28
IOI '99 P5 - Flatten
IOI
15p
21.8%
16
IOI '99 P6 - A Strip of Land
IOI
20p
13.4%
34
IOIQR P5 - Some Game
Seasonal
25
3.5%
3
Is it a Tree?
Seasonal
7p
33.2%
731
Jack Needs Help
Uncategorized
10p
32.0%
20
James' Rectangles
Uncategorized
10p
33.7%
88
James' XOR Update
Uncategorized
12p
27.9%
32
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