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Random
Hot problems
CCC '24 S2 - Heavy-Light Composition
SAC '22 Code Challenge 5 P2 - Querying Extensions
Max's Anger Contest Series 2 P2 - Password Anger
CCC '12 S2 - Aromatic Numbers
The Cosmic Era P2 - Uneven Sand
CCC '20 J4 - Cyclic Shifts
CCC '13 J4 - Time on task
Problem
Category
Points ▴
AC %
Users
PIB '20 P3 - Rulebreaker
Uncategorized
7p
29.5%
55
COCI '19 Contest 4 #2 Spiderman
COCI
7p
19.7%
51
COCI '19 Contest 3 #2 Grudanje
COCI
7p
50.0%
53
COCI '19 Contest 6 #2 Birmingham
COCI
7p
42.2%
76
Wesley's Anger Contest 4 Problem 2 - Squirrel Election
WAC
7p
20.3%
211
Wesley's Anger Contest 5 Problem 2 - MATH 137 at Squirreloo
WAC
7p
39.0%
190
Teleportation Tangle
Uncategorized
7p
28.4%
31
QCC P6 - Freedom!
Uncategorized
7p
38.4%
70
Exam Prep
Uncategorized
7p
24.6%
223
ECOO '20 P3 - Captcha Fun
ECOO
7p
24.9%
103
UCC Coding Competition '20 P4 - Bubble Tea
Uncategorized
7p
43.6%
223
UCC Coding Competition '20 P5 - Public Transport
Uncategorized
7p
53.8%
164
Mathtermind
Uncategorized
7
42.2%
9
CCO '04 P5 - Jengaism
CCO
7
31.8%
116
COCI '15 Contest 7 #2 Prozor
COCI
7p
37.9%
21
COCI '09 Contest 4 #3 IKS
COCI
7
34.2%
68
ACM U of T Tryouts C1 C - Foxhole
ICPC
7
30.7%
128
ACM U of T Tryouts C2 D - Diablo Bot
ICPC
7p
8.2%
97
ACM U of T Tryouts C1 E - Foxling Feeding Frenzy
ICPC
7
30.3%
118
WC '18 Contest 1 S2 - Essay Generator
Woburn Challenge
7p
37.6%
222
WC '18 Contest 1 S1 - Inspiration
Woburn Challenge
7p
29.0%
67
IOI '09 P5 - Garage
IOI
7
46.4%
532
IOI '09 P3 - POI
IOI
7
28.8%
528
NOI '98 P1 - Personal Income Tax
China NOI
7
57.5%
20
NOI '00 P4 - Trie
China NOI
7
50.3%
120
NOI '97 P2 - Optimal Routing
China NOI
7p
28.5%
59
NOI '97 P1 - Competition Ranking
China NOI
7
32.3%
38
NOI '11 P4 - Road Construction
China NOI
7p
44.8%
101
Maximum Sum
Uncategorized
7
33.4%
789
Longest Increasing Subsequence
Uncategorized
7
29.4%
650
PEG Test '14 - Air
Uncategorized
7
21.4%
49
PEG Test '14 - Change
Uncategorized
7
39.3%
50
BlueBook - Bills Bills Bills
BlueBook
7
13.7%
147
BlueBook - Calculator
BlueBook
7
21.2%
143
Graph Contest 2 P1 - Connected Components
Uncategorized
7
36.2%
250
Graph Contest 3 P1 - Travelling Salesmen
Uncategorized
7
33.4%
298
Graph Contest 2 P3 - Trees
Uncategorized
7
33.5%
148
Graph Contest 3 P3 - Cable TV
Uncategorized
7
39.2%
187
ACSL '09 Practice P1 - Kansas
Uncategorized
7
14.7%
67
ACSL '09 Practice P4 - Rank
Uncategorized
7
45.9%
852
ICPC NEERC 2010 A - Alignment of Code
ICPC
7
54.0%
21
CCO '03 P5 - Longest Substring
CCO
7p
15.9%
87
MMM '14 A - Distinct Prime Factors
Uncategorized
7
26.4%
226
Mock CCC '14 S3 - Spreadsheet Sorting
Mock CCC
7
49.0%
425
Mock CCC '14 S2 - Sleep Cycle
Mock CCC
7p
15.9%
103
Mock CCC '14 J4 - Selecting Shifts
Mock CCC
7p
11.5%
52
Alawn's Problem
Uncategorized
7
42.0%
26
COCI '09 Contest 5 #3 Kletva
COCI
7
19.6%
31
COCI '12 Contest 1 #2 F7
COCI
7
50.7%
33
COCI '12 Contest 1 #3 Koncert
COCI
7
25.4%
10
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