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Random
Hot problems
WC '95 P4 - Wildcard
Cheerio Contest 1 S2 - School Expansion
Appleby Contest '19 P5 - Matrix Operation
CCC '16 S4 - Combining Riceballs
Max's Anger Contest Series 2 P3 - Array Anger
SAC '22 Code Challenge 5 P2 - Querying Extensions
CCCHK '15 J4 - Where to build my house?
Problem
Category
Points
AC %
Users ▴
IOI '09 P1 - Archery
IOI
45p
13.4%
37
Balkan OI '11 P3 - Medians
Balkan OI
12p
27.6%
37
IOI '15 P3 - Teams (Standard I/O)
IOI
35p
3.4%
37
IOI '20 P3 - Carnival Tickets
IOI
20p
11.8%
37
COCI '11 Contest 1 #1 Jabuke
COCI
5p
54.3%
37
COCI '17 Contest 3 #2 Programiranje
COCI
7p
45.9%
37
CCO '01 P4 - Breaking Level (Standard I/O)
CCO
12
7.9%
37
UCRPC F21 D - Stake Your Claim
ICPC
10
54.9%
37
NOIP '18 P3 - Constructing Tracks
China NOI
17p
21.1%
37
Yet Another Contest 2 P6 - Travel Budget
YAC
20p
15.0%
37
Distinct Shapes
Uncategorized
10
22.1%
37
COCI '23 Contest 1 #3 AN2DL
COCI
12p
28.6%
37
COCI '14 Contest 3 #3 Silueta
COCI
12p
29.9%
38
DMOPC '15 Contest 4 P5 - Scribe
DMOPC
15p
26.7%
38
DMOPC '15 Contest 4 P6 - Alarms
DMOPC
12p
37.5%
38
COCI '15 Contest 3 #2 Esej
COCI
5
12.3%
38
IOI '13 P3 - Wombats
IOI
40p
13.2%
38
Facebook Hacker Cup '17 Qualifying Round P2 - Lazy Loading
FHC
5p
41.5%
38
TLE '16 Contest 7 P1 - Math Helper
TLE
5p
17.0%
38
Mock CCO '17 Problem 3 - Connection
Mock CCO
20p
12.5%
38
DMOPC '17 Contest 1 P6 - Land of the Carrot Trees
DMOPC
20p
19.6%
38
DWITE '09 R2 #3 - Binary Test String
DWITE
5
36.2%
38
TLE '17 Contest 4 P6 - Fax's Christmas Bash
TLE
25p
18.8%
38
DMOPC '17 Contest 4 P5 - Revised IOI
DMOPC
12
28.8%
38
Mock CCO '18 Contest 4 Problem 2 - Sunken Colonies
Mock CCO
15p
43.5%
38
IOI '11 P1 - Tropical Garden
IOI
25p
15.3%
38
New Year's '19 P7 - The Order of the Fox
Seasonal
20
10.6%
38
LKP '18 Contest 2 P4 - The Zagonetka Machine
Uncategorized
12p
13.9%
38
COCI '18 Contest 6 #4 Simfonija
COCI
15p
20.9%
38
DMPG '19 S4 - Confusing Crossword Conundrum
DMOPC
12p
13.5%
38
CCO '02 P4 - Duathlon
CCO
10
11.3%
38
COCI '19 Contest 1 #5 Zoo
COCI
12p
31.5%
38
NOI '97 P1 - Competition Ranking
China NOI
7
32.3%
38
IOI '03 P5 - Amazing Robots
IOI
20
11.4%
38
WC '95 P2 - Round Numbers
Woburn Challenge
12p
8.7%
38
WC '99 P6 - Fight Club
Woburn Challenge
10
23.8%
38
Stingy Candyman
Uncategorized
10
24.5%
38
UTS Open '21 P4 - Lucky Graph
Uncategorized
15p
16.9%
38
Cheerio Contest 2 P3 - Digits
Uncategorized
5p
20.4%
38
SAC '22 Code Challenge 4 Junior P5 - Obligatory Output Only Problem
SAC Coding Challenge
10
24.6%
38
A Math Contest P14 - Choosing Marbles
Uncategorized
25p
21.9%
38
Baltic OI '11 P6 - Plagiarism
Baltic OI
7p
27.4%
38
Lyndon's Golf Contest 1 P7 - Fun Factoring
Uncategorized
0p
40.5%
38
Mock CCC '23 2 S2 - Keenan Hates Triangles
Mock CCC
7p
2.3%
38
EGOI '23 P6 - Candy
EGOI
12p
22.0%
38
Amplitude Hackathon '23 Problem 3 - Dedupe
Uncategorized
5p
53.3%
38
Amplitude Hackathon '23 Problem 2 - Gigatron Lag
Uncategorized
3p
26.2%
38
COCI '14 Contest 5 #4 Zgodan
COCI
7p
21.8%
39
CCO Preparation Test 1 P2 - Escape Maze
Mock CCO
20p
12.0%
39
CCO Preparation Test 2 P3 - Subsets
Mock CCO
20p
16.7%
39
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