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Hot problems
CCC '12 S3 - Absolutely Acidic
CCC '21 J3 - Secret Instructions
CCC '24 S2 - Heavy-Light Composition
DMOPC '20 Contest 4 P1 - Missing Numbers
COCI '06 Regional #3 Firefly
ECOO '19 R1 P1 - Free Shirts
ACSL '09 Practice P4 - Rank
Problem
Category
Points
AC %
Users ▴
IOI '14 P5 - Friend
IOI
30p
26.0%
98
COCI '15 Contest 3 #3 Molekule
COCI
10
52.8%
98
DMOPC '16 Contest 3 P3 - Phantom Fight
DMOPC
10p
14.1%
98
COCI '08 Contest 4 #6 Periodni
COCI
20p
24.5%
98
DWITE '07 R1 #3 - Where's my QWERTY?
DWITE
3
41.3%
98
VMSS Pre-Windsor P6 - You Can't Write Science Fiction Better Than This
Uncategorized
7
33.3%
98
Creating a Sequence
Uncategorized
3p
45.2%
98
COCI '09 Contest 2 #2 Rimski
COCI
5
24.3%
98
Path Finder
Uncategorized
10p
15.6%
98
COCI '09 Contest 2 #4 Vuk
COCI
10
31.7%
98
DMOJ Capture The Flag '20 C2 - Small RSA
CTF
5
35.9%
98
COCI '09 Contest 7 #2 Cokolada
COCI
7
44.8%
98
DMOPC '21 Contest 6 P4 - Colourful Paths
DMOPC
15p
9.1%
98
Singularity Cup P3 - Interplanetary Travel
Uncategorized
15p
9.4%
98
COCI '14 Contest 7 #1 Teta
COCI
5p
46.1%
99
GFSSOC '15 Fall Practice P2 - Bruno and Tennis
GFSSOC
5p
29.2%
99
IOI '14 P4 - Gondola
IOI
15p
11.1%
99
Baltic OI '18 P6 - Paths
Baltic OI
15p
32.8%
99
CEOI '17 P4 - Building Bridges
CEOI
20p
20.0%
99
CEOI '17 P5 - Palindromic Partitions
CEOI
15p
29.9%
99
DMPG '19 B5 - Triangles
DMOPC
10p
10.9%
99
COCI '12 Contest 1 #1 DOM
COCI
3
56.2%
99
SAC '22 Code Challenge 2 P4 - Cookie Galore
SAC Coding Challenge
10
35.4%
99
VM7WC '16 #1 Silver - Project Feng: Multiple Statements
VM7WC
5
17.9%
100
COCI '06 Contest 3 #5 Bicikli
COCI
15
5.4%
100
DWITE '09 R4 #1 - Social Media Overload
DWITE
3
65.9%
100
Mock CCC '19 Contest 1 S4 - Pusheen Plays Neko Atsume
Mock CCC
12
17.8%
100
Educational DP Contest AtCoder Y - Grid 2
Uncategorized
17
31.6%
100
COCI '19 Contest 5 #4 Putovanje
COCI
15p
37.3%
100
PIB '20 P2 - 2 + 2 = 5
Uncategorized
5p
31.9%
100
WC '16 Contest 2 J1 - The Perfect Mate
Woburn Challenge
3
28.0%
100
DWITE '06 R5 #3 - UPC Check Digit
DWITE
5
38.0%
100
COCI '21 Contest 4 #1 Autići
COCI
5p
28.5%
100
DMOPC '14 Contest 4 P4 - Sketchley Park
DMOPC
12p
16.1%
101
Sword Art Online Judge
Seasonal
7
14.0%
101
TLE '16 Contest 6 (Mock CCC) J1 - Paper Printing
TLE
3p
8.8%
101
CCCHK '08 J4 - Tic-tac-toe
CCC
5p
10.5%
101
DWITE '12 R2 #1 - Sugar Rush
DWITE
3
30.4%
101
DMOPC '18 Contest 3 P1 - Bob and Music Class
DMOPC
5
46.0%
101
CCO '02 P5 - Connect The Campus
CCO
12
31.0%
101
NOI '11 P4 - Road Construction
China NOI
7p
44.8%
101
A Block Game
Uncategorized
3
40.2%
101
Cheerio Contest 1 S2 - School Expansion
Uncategorized
7p
31.0%
101
COCI '14 Contest 4 #3 Pripreme
COCI
10p
40.3%
102
CCO '15 P5 - Timpanist
CCO
20p
36.5%
102
DMPG '16 B3 - CCO
DMOPC
5
41.8%
102
IOI '15 P4 - Horses
IOI
15p
11.4%
102
RGPC '17 P4 - Snow Day
Uncategorized
10p
14.4%
102
COCI '07 Contest 6 #4 George
COCI
15
52.9%
102
ECOO '17 R3 P2 - Family Trees
ECOO
7p
27.0%
102
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