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Random
Hot problems
CCC '24 S2 - Heavy-Light Composition
APIO '09 P3 - The Great ATM Robbery
COCI '11 Contest 5 #2 Eko
String Finding
ICPC PACNW 2016 A - Alphabet
Appleby Contest '19 P5 - Matrix Operation
CCO '07 P2 - Snowflakes
Problem
Category
Points
AC %
Users ▾
JSB '19 - P1
CTF
5
8.4%
27
Art Academy VI: The Last Stand
Uncategorized
12p
23.0%
27
ACM U of T Tryouts C2 C - Homemade Asteroids
ICPC
10
19.5%
27
NOI '97 P6 - Satellite Coverage
China NOI
12p
39.5%
27
Bulgarian OI '09 P5 - Special Sequence
Bulgarian OI
30p
14.0%
27
COCI '09 Contest 4 #5 Kaboom
COCI
12
40.2%
27
ACSL '09 Practice P7 - Cube
Uncategorized
15
16.1%
27
WC '99 P7 - The Rock
Woburn Challenge
15
23.5%
27
Baltic OI '17 P5 - Plus Minus
Baltic OI
15p
38.5%
27
Bus Stops
Uncategorized
10
24.0%
27
COCI '11 Contest 1 #2 Matrix
COCI
7p
32.2%
27
COCI '16 Contest 7 #4 Poklon
COCI
15p
16.7%
27
COCI '17 Contest 6 #1 Davor
COCI
5
52.8%
27
COCI '20 Contest 5 #3 Magenta
COCI
12p
9.7%
27
Monkey Cards
Uncategorized
12
30.4%
27
Baltic OI '07 P6 - Sequence
Baltic OI
12p
27.2%
27
COI '17 #1 Paprike
COCI
12p
52.9%
27
Mock CCC '23 1 S3 - Richard The Penguin
Mock CCC
10p
5.9%
27
Amplitude Hackathon '23 Practice Problem 5 - What is Spenser's Last Name?
Uncategorized
0p
42.4%
27
Tree Journey
Olympiads School
12p
50.0%
27
STNBD P5 - Fianna Ray Ordesia
Uncategorized
10p
12.0%
26
New Year's '15 P6 - Tiles
Seasonal
20p
23.8%
26
UTS Open '15 #2 - Secret Code
Uncategorized
10p
17.1%
26
Linked List
Uncategorized
20p
6.9%
26
DMOPC '16 Contest 2 P6 - Console Simulator 2017
DMOPC
12p
12.0%
26
ICPC ECNA 2016 E - Red Rover
ICPC
7
49.0%
26
TLE '16 Contest 5 P2 - Playing Piano
TLE
10p
15.6%
26
TLE '16 Contest 6 (Mock CCC) S5 - Toll Routes
TLE
20p
3.9%
26
ECOO '17 R2 P3 - Lunch Time
ECOO
12p
16.0%
26
ECOO '14 R3 P3 - Future City
ECOO
10p
26.9%
26
TLE '17 Contest 1 P5 - Cake
TLE
15p
15.0%
26
DWITE '09 R5 #5 - Weak Passwords
DWITE
5
38.5%
26
DWITE '08 R3 #5 - Now in 3D
DWITE
7
78.7%
26
ICHB Selection Contest '17 Problem 2 - Black Star's Visit
Uncategorized
7p
8.5%
26
DMPG '18 G4 - Variation
DMOPC
15p
31.5%
26
JOI '18 Open P1 - Bubble Sort 2
JOI
20p
5.2%
26
Triway Cup '19 Summer B - Cameras
Seasonal
5
28.9%
26
Triway Cup '19 Summer E - Solar Power
Seasonal
5
21.1%
26
Another Contest 5 Problem 4 - Tudor Interacts With Poop
ACC
15p
16.1%
26
IOI '19 P2 - Split the Attractions
IOI
40p
5.1%
26
DMOPC '19 Contest 5 P6 - Cecilia's Computational Crisis
DMOPC
20p
8.2%
26
COCI '19 Contest 2 #3 Checker
COCI
12p
28.7%
26
ACM U of T Tryouts C1 F - Foxic Expressions
ICPC
15
15.1%
26
NOI '01 P6 - Secret of the Meteorite
China NOI
15p
27.4%
26
Good Celebration
Uncategorized
12
13.2%
26
IOI '95 P1 - Packing Rectangles
IOI
15p
45.3%
26
Alawn's Problem
Uncategorized
7
42.0%
26
WC '17 Contest 4 S1 - Wakandan Sabotage
Woburn Challenge
10p
19.1%
26
WC '16 Contest 2 J2 - EHC
Woburn Challenge
7p
11.1%
26
Secret Room
Uncategorized
25p
8.4%
26
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