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Random
Hot problems
COCI '08 Contest 3 #2 Kemija
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Yet Another Contest 8 P2 - No More Modern Art
2spooky4me
Problem
Category
Points
AC %
Users ▴
Amplitude Hackathon '23 Problem 5 - Partition Assignment
Uncategorized
7p
22.5%
19
Amplitude Hackathon '23 Practice Problem 2 - Go Amplitude!
Uncategorized
5p
14.3%
19
COCI '23 Contest 4 #4 Putovanje
COCI
20p
10.7%
19
CCO Preparation Test 3 P1 - Primitive Pythagorean Pairs
Mock CCO
25p
13.7%
20
DMOPC '15 Contest 5 P6 - Event Horizon
DMOPC
25p
11.1%
20
ICPC ECNA 2005 F - Square Count
ICPC
15
39.5%
20
Facebook Hacker Cup '17 Qualifying Round P1 - Progress Pie
FHC
5p
34.6%
20
ECOO '12 R2 P2 - Password Strength
ECOO
5p
14.0%
20
COCI '08 Regional #5 Reljef
COCI
15
52.8%
20
DWITE '11 R4 #3 - Breaking Bonds
DWITE
7
45.7%
20
Ternary Search Tree
Uncategorized
5
65.9%
20
Expected Value
Uncategorized
15
24.5%
20
DMPG '19 G1 - Camera Calibration Challenge
DMOPC
12p
7.5%
20
When GCD meets XOR
Uncategorized
17
20.1%
20
COCI '18 Contest 6 #5 Mobitel
COCI
20p
30.7%
20
CEOI '18 P3 - Lottery
CEOI
25p
40.0%
20
Miniature Sudoku
Uncategorized
7
31.9%
20
OCC '19 B5 - Gold
Olympiads School
7
12.0%
20
A Permutation Problem 2
Uncategorized
12
30.7%
20
Mock CCC '20 Contest 1 J5 - A Prime Problem
Mock CCC
12p
2.8%
20
NOI '98 P1 - Personal Income Tax
China NOI
7
57.5%
20
NOI '13 P2 - Tree Count
China NOI
25p
12.3%
20
NOI '13 P1 - Inner Product
China NOI
20p
7.0%
20
SMAC 08/09 (Oct) #4 - Daycare
Uncategorized
15p
4.5%
20
SMAC 08/09 (Nov) #1 - Befungulator
Uncategorized
10
23.8%
20
WC '15 Contest 4 S3 - Coded Paper
Woburn Challenge
17p
20.4%
20
CCCHK '15 S3 - Symmetric Cross
CCC
12p
16.2%
20
The Codefather
Uncategorized
15p
6.5%
20
Assembly Elves
Uncategorized
10p
12.4%
20
COCI '09 Contest 6 #5 Holmes
COCI
25p
28.4%
20
Secret Santa
Uncategorized
15
13.0%
20
You Might be a Redneck
Uncategorized
10p
8.8%
20
Baltic OI '05 P5 - Bus Trip
Baltic OI
17
51.9%
20
JOI '16 Final P1 - Foehn Phenomena
JOI
10p
65.1%
20
COCI '10 Contest 2 #4 Knjige
COCI
5p
36.6%
20
COCI '10 Contest 4 #3 Astro
COCI
7p
39.0%
20
COCI '11 Contest 3 #3 Pogodak
COCI
10p
36.8%
20
COCI '13 Contest 3 #3 Rečenice
COCI
7p
42.6%
20
COCI '12 Contest 1 #5 Snaga
COCI
12p
22.3%
20
COCI '17 Contest 7 #5 Dostavljač
COCI
15
35.8%
20
Jack Needs Help
Uncategorized
10p
32.0%
20
NOI '20 P4 - Dish
China NOI
20p
7.6%
20
UCRPC F21 E - Feeding Friendsy
ICPC
7p
13.2%
20
Baltic OI '09 P2 - Candy Machine
Baltic OI
12p
37.1%
20
DMOPC '21 Contest 5 P6 - Permutations & Primes
DMOPC
25p
6.2%
20
Baltic OI '11 P3 - Switch the Lamp On
Baltic OI
12p
24.7%
20
COI '10 #3 Rijeka
COCI
10p
34.3%
20
COI '11 #1 Kampanja
COCI
20p
26.8%
20
A Math Contest P12 - Triangles
Uncategorized
17
28.8%
20
A Math Contest P16 - Morbius vs. Suibom
Uncategorized
25
18.2%
20
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