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Random
Hot problems
Educational DP Contest AtCoder C - Vacation
COCI '14 Contest 5 #3 Traktor
CCCHK '15 J3 - Queens can't attack me!
IOI '04 P4 - Phidias
CCC '10 J2 - Up and Down
IOI '14 Practice Task 1 - Square
COCI '07 Contest 4 #4 Muzicari
Problem
Category
Points
AC %
Users ▾
COCI '17 Contest 6 #3 Mate
COCI
12p
17.2%
18
COCI '20 Contest 5 #4 Planine
COCI
17p
13.1%
18
DMOPC '21 Contest 3 P5 - Crowded Travels
DMOPC
20p
21.2%
18
DMOPC '20 Contest 6 P6 - Dumping Buckets
DMOPC
25p
9.7%
18
COCI '21 Contest 1 #5 Volontiranje
COCI
25p
20.0%
18
Baltic OI '09 P2 - Candy Machine
Baltic OI
12p
35.6%
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
Imperative French
Uncategorized
15
5.5%
17
DMOPC '14 Contest 6 P6 - Trip
DMOPC
17p
20.6%
17
Facebook Hacker Cup '15 Round 3 P3 - Gentrification
FHC
25p
42.9%
17
MWC '15 #3 P2: Mechanical Pencils
MWC
5p
16.1%
17
One Small Favour
Uncategorized
10p
1.2%
17
TSOC '16 Contest 2 #5 - Last Trip to Surface
TSOC
20
15.7%
17
A Simple Minus
Uncategorized
10
27.4%
17
HCI '16 - Wizardry
Uncategorized
7
5.3%
17
HCI '16 - Poké Problem
Uncategorized
7
56.8%
17
Bubble Cup V8 G Run for beer
Bubble Cup
20
4.1%
17
ECOO '14 R2 P4 - What Lies Ahead
ECOO
10p
26.0%
17
TLE '17 Contest 1 P6 - Investment
TLE
35p
16.9%
17
DMOPC '17 Contest 3 P4 - Solitaire Logic
DMOPC
10p
28.4%
17
DWITE '09 R3 #4 - Spiral Out
DWITE
7
69.0%
17
DWITE '07 R3 #4 - The Convex Fence Company
DWITE
10
25.4%
17
TLE '17 Contest 3 P4 - Meatballs
TLE
12p
5.9%
17
A New Country
Uncategorized
25p
25.1%
17
Mock CCC '18 Contest 1 S5 - A Palindrome Problem
Mock CCC
15p
8.1%
17
A Simple Multiplication
Uncategorized
12
14.0%
17
DMOPC '18 Contest 3 P5 - Bob and Physics Class
DMOPC
15p
13.9%
17
Wesley's Anger Contest 1 Problem 5 - Rule of Four
WAC
20p
13.9%
17
DMOPC '19 Contest 1 P4 - A Strange Graph
DMOPC
15p
9.7%
17
NOI '02 P6 - Robot No. M
China NOI
25p
33.3%
17
WC '16 Contest 2 S3 - Turbolift Testing
Woburn Challenge
15p
13.0%
17
WC '16 Contest 3 J2 - Pokéwarehouses
Woburn Challenge
7p
12.5%
17
WC '17 Contest 4 S3 - Guardians of the Cash
Woburn Challenge
15p
26.5%
17
Prime Bag
Uncategorized
20p
6.9%
17
COCI '09 Contest 6 #6 Gremlini
COCI
25p
12.9%
17
Balkan OI '11 P4 - Compare
Balkan OI
25p
28.8%
17
ICPC SWERC 2017 D - Candy Chain
ICPC
15
27.8%
17
IOI '20 P1 - Comparing Plants
IOI
40p
6.4%
17
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
COCI '20 Contest 4 #4 Janjetina
COCI
20p
23.1%
17
Riddle Troll
Uncategorized
10
27.3%
17
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