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Random
Hot problems
COCI '08 Contest 3 #6 Najkraci
APIO '10 P1 - Commando
JOI '14 Open P1 - Factories
CCC '14 S1 - Party Invitation
CCC '16 J3 - Hidden Palindrome
CCC '19 S4 - Tourism
WC '17 Contest 3 J3 - Uncrackable
Problem
Category
Points
AC % ▴
Users
ECOO '17 R3 P4 - Ice Cream Beach
ECOO
15p
18.5%
36
CCC '10 S3 - Firehose
CCC
15p
18.5%
651
DMOPC '19 Contest 7 P6 - Bob Equilibrium
DMOPC
30p
18.5%
51
CCO '15 P6 - Eggscavation
CCO
30p
18.5%
70
TLE '17 Contest 5 P6 - Circuits
TLE
20p
18.5%
19
EGOI '23 P2 - Padel Prize Pursuit
EGOI
10p
18.5%
32
DMOPC '18 Contest 4 P5 - Dr. Henri and Wormholes
DMOPC
25p
18.5%
53
WC '99 P2 - Mission Impossible
Woburn Challenge
7
18.5%
56
COCI '06 Contest 5 #3 Tenis
COCI
10p
18.5%
74
IOI '00 P1 - Palindrome
IOI
10p
18.5%
830
WC '15 Contest 2 S3 - Revenge of the Sith
Woburn Challenge
15p
18.5%
33
COCI '11 Contest 4 #3 Keks
COCI
7p
18.5%
34
CEOI '16 P5 - Popeala
CEOI
25p
18.6%
11
COCI '11 Contest 4 #2 Zima
COCI
7p
18.6%
12
CCO '22 P2 - Rainy Markets
CCO
17p
18.6%
104
Mock CCC '19 Contest 1 J3 - Pusheen Eats Tuna Sashimi and Tuna Nigiri
Mock CCC
3p
18.6%
351
CCO '13 P1 - All Your Base Belong to Palindromes
CCO
10p
18.6%
209
COCI '21 Contest 4 #2 Autobus
COCI
10p
18.6%
73
WC '16 Contest 3 J1 - The Elite N
Woburn Challenge
7p
18.6%
33
IOI '15 P5 - Sorting (Standard I/O)
IOI
25p
18.6%
186
DMPG '17 B4 - Bad Sort
DMOPC
7
18.6%
71
VMSS Pre-Windsor P4 - Character Analysis
Uncategorized
5
18.6%
102
HCI '16 - Hearing
Uncategorized
15p
18.6%
5
JOI '21 Spring Camp Day 3 P3 - Meetings 2
JOI
30p
18.6%
8
DMOPC '16 Contest 4 P2 - Systests
DMOPC
7p
18.6%
385
SAC '22 Code Challenge 4 Junior P4 - Obligatory Permutation Problem
SAC Coding Challenge
7p
18.6%
98
DMOPC '19 Contest 7 P2 - Dinner Party
DMOPC
10
18.6%
143
DMOPC '22 Contest 4 P2 - Fake Painting
DMOPC
10p
18.6%
89
DMOPC '14 Contest 3 P4 - Not Enough Testers!
DMOPC
10p
18.6%
416
IOI '13 P4 - Cave
IOI
10p
18.6%
311
Inaho V
Uncategorized
3p
18.7%
210
CCC '99 S4 - A Knightly Pursuit
CCC
12
18.7%
348
Still Too Simple
Seasonal
10
18.7%
43
DMOPC '18 Contest 1 P6 - Sorting
DMOPC
20p
18.7%
30
DMOPC '17 Contest 5 P5 - XOR Bridges
DMOPC
15p
18.7%
52
CCC '15 S3 - Gates
CCC
10p
18.7%
1778
DMOPC '14 Contest 1 P6 - Biology Homework
DMOPC
17p
18.7%
33
Baltic OI '01 P1 - Postman
Baltic OI
10p
18.7%
25
DMPG '15 G3 - Kinako Bread 2
DMOPC
30p
18.7%
69
COCI '15 Contest 3 #5 Nekameleoni
COCI
20p
18.7%
66
DMOPC '15 Contest 1 P6 - Lelei and Contest
DMOPC
17p
18.7%
391
NOI '06 P6 - The Magical Bag
China NOI
20p
18.8%
11
COCI '20 Contest 1 #5 Tenis
COCI
17p
18.8%
7
DMOPC '21 Contest 10 P6 - Median Replace
DMOPC
25p
18.8%
28
An Animal Contest 3 P2 - Monkey Potato
AAC
5p
18.8%
556
TLE '17 Contest 4 P6 - Fax's Christmas Bash
TLE
25p
18.8%
38
CCO '15 P4 - Cars on Ice
CCO
10p
18.8%
208
IOI '94 P2 - The Castle
IOI
10
18.8%
127
CCC '06 S5 - Origin of Life
CCC
15
18.8%
118
Checker Number
Uncategorized
7
18.8%
29
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