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Random
Hot problems
ACSL '09 Practice P4 - Rank
CCC '19 S2 - Pretty Average Primes
COCI '14 Contest 6 #4 Kratki
UACC 1 P3 - Cheeky Checkers
IOI '06 P2 - Pyramid
Knapsack 4
DMOPC '14 Contest 4 P3 - Golden Lily
Problem
Category
Points
AC %
Users ▴
Tall
Uncategorized
15p
12.4%
18
COCI '12 Contest 4 #1 Orehnjaca
COCI
5p
43.5%
18
COCI '17 Contest 6 #3 Mate
COCI
12p
17.2%
18
COCI '20 Contest 5 #4 Planine
COCI
17p
13.1%
18
COCI '20 Contest 4 #4 Janjetina
COCI
20p
23.0%
18
DMOPC '21 Contest 3 P5 - Crowded Travels
DMOPC
20p
20.8%
18
DMOPC '20 Contest 6 P6 - Dumping Buckets
DMOPC
25p
9.7%
18
Baltic OI '09 P4 - Rectangle
Baltic OI
10p
12.1%
18
An Animal Contest 6 P5 - Rock Painting
AAC
20p
12.3%
18
Baltic OI '11 P4 - Treasures and Vikings
Baltic OI
15p
37.7%
18
NOI '16 P4 - Interval
China NOI
20p
21.6%
18
Cheerio Contest 2 P4 - Modulus Finding
Uncategorized
7p
14.5%
18
EGOI '22 P2 - Lego Wall
EGOI
15p
12.2%
18
Lyndon's Golf Contest 1 P4 - Symbolic Ruby
Uncategorized
0p
13.2%
18
CCO '23 P6 - Triangle Collection
CCO
25p
16.7%
18
Mock CCC '24 Contest 1 S5 - Mock CCC 2025
Mock CCC
20p
14.2%
18
COCI '23 Contest 5 #4 Rolete
COCI
15p
27.3%
18
Equivalent Addresses
Uncategorized
7
32.3%
19
DMOPC '16 Contest 3 P5 - Shoe Shopping II
DMOPC
15p
31.3%
19
TLE '16 Contest 5 P4 - Engineering Test
TLE
12p
9.6%
19
DWITE '10 R1 #5 - Ricochet Robot
DWITE
7
42.1%
19
DWITE '11 R2 #4 - Bear Trees
DWITE
10
21.6%
19
DWITE '09 R5 #3 - Summary Diff
DWITE
5
61.8%
19
TLE '17 Contest 4 P4 - Willson and Target Practice
TLE
17p
10.3%
19
New Year's '18 P8 - Snowy Streets
Seasonal
25p
11.1%
19
TLE '17 Contest 5 P6 - Circuits
TLE
20p
18.5%
19
TLE '17 Contest 8 P4 - Gamma Waves
TLE
20p
8.7%
19
GlobeX Cup '18 S5 - Math Bash
Uncategorized
17
12.1%
19
A Combining Problem
Uncategorized
20
14.8%
19
COCI '18 Contest 6 #1 Lun
COCI
5p
65.5%
19
CCO '99 P4 - Maple Roundup
CCO
10
21.8%
19
CPC '19 Contest 1 P4 - Sorting Practice
Uncategorized
12p
7.4%
19
OCC '19 B6 - Fiji water
Olympiads School
10p
16.6%
19
GlobeX Cup '19 S3 - Ninjaclasher's Wrath
Uncategorized
12p
12.2%
19
GlobeX Cup '19 J5 - Aliens
Uncategorized
15
12.6%
19
Boxdropper
Uncategorized
20p
21.8%
19
ICPC NEERC 2010 K - Graph Oddity
ICPC
12p
28.8%
19
SMAC 08/09 (Nov) #2 - Stock Market II
Uncategorized
10p
7.6%
19
WC '17 Finals S3 - Explosive Ordinance Disposal
Woburn Challenge
15p
24.4%
19
WC '01 P4 - Cool Runnings
Woburn Challenge
10
24.2%
19
WC '02 P10 - The Final Battle
Woburn Challenge
10
23.5%
19
CCCHK '15 S3 - Symmetric Cross
CCC
12p
15.8%
19
Baltic OI '19 P5 - Necklace
Baltic OI
17p
11.7%
19
Digger
Uncategorized
15p
16.2%
19
COCI '10 Contest 2 #4 Knjige
COCI
5p
36.2%
19
COCI '12 Contest 2 #2 Krizaljka
COCI
5p
51.4%
19
COCI '17 Contest 5 #5 Pictionary
COCI
17p
44.0%
19
NOI '20 P4 - Dish
China NOI
20p
7.6%
19
COCI '21 Contest 1 #5 Volontiranje
COCI
25p
20.2%
19
Yet Another Contest 1 P5 - Hopping Kangaroos
YAC
17p
12.3%
19
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