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Hot problems
CCC '25 J3 - Product Codes
CCC '25 J5 - Connecting Territories
CCC '25 J4 - Sunny Days
Longest Increasing Subsequence
Longest Increasing Subsequence
Problem
Category
Points
AC %
Users
SAC '21 Code Challenge P4 - Averaging Averages
SAC Coding Challenge
5p
29.2%
250
SAC '21 Code Challenge P5 - Friends of Friends
SAC Coding Challenge
7p
22.5%
264
SAC '22 Code Challenge 1 P1 - That Teacher
SAC Coding Challenge
3
67.5%
702
SAC '22 Code Challenge 1 P2 - That Circle
SAC Coding Challenge
3
48.2%
258
SAC '22 Code Challenge 1 P3 - That Pool
SAC Coding Challenge
7p
16.9%
88
SAC '22 Code Challenge 1 P4 - That Problem
SAC Coding Challenge
7p
19.6%
78
SAC '22 Code Challenge 1 P5 - That Wall
SAC Coding Challenge
12
27.4%
39
SAC '22 Code Challenge 2 P1 - Calendar Management
SAC Coding Challenge
5
32.4%
96
SAC '22 Code Challenge 2 P2 - Cookie Sprinkler
SAC Coding Challenge
5
53.1%
108
SAC '22 Code Challenge 2 P3 - Rating Choices
SAC Coding Challenge
7
37.4%
82
SAC '22 Code Challenge 2 P4 - Cookie Galore
SAC Coding Challenge
10
36.8%
117
SAC '22 Code Challenge 2 P5 - Even Colouring
SAC Coding Challenge
10p
34.4%
85
SAC '22 Code Challenge 3 Junior P1 - Normal Problem
SAC Coding Challenge
3p
67.6%
381
SAC '22 Code Challenge 3 Junior P2 - Normal Lines
SAC Coding Challenge
3p
69.0%
332
SAC '22 Code Challenge 3 Junior P3 - Normal Probabilities
SAC Coding Challenge
3p
68.5%
262
SAC '22 Code Challenge 3 Junior P4 - Normal Conversions
SAC Coding Challenge
5p
28.2%
174
SAC '22 Code Challenge 3 Junior P5 - Normal Encoding
SAC Coding Challenge
10p
17.9%
35
SAC '22 Code Challenge 3 P1 - Hair Hazards
SAC Coding Challenge
3
73.6%
624
SAC '22 Code Challenge 3 P2 - Unicycle License
SAC Coding Challenge
5
41.6%
277
SAC '22 Code Challenge 3 P3 - Bob Sort
SAC Coding Challenge
5p
26.8%
172
SAC '22 Code Challenge 3 P4 - Finding Friends
SAC Coding Challenge
15p
21.9%
69
SAC '22 Code Challenge 3 P5 - Chat Corrections
SAC Coding Challenge
12p
16.0%
43
SAC '22 Code Challenge 4 Junior P1 - Obligatory DeMello Problem
SAC Coding Challenge
3
63.2%
285
SAC '22 Code Challenge 4 Junior P2 - Obligatory Geometry Problem
SAC Coding Challenge
3p
52.7%
229
SAC '22 Code Challenge 4 Junior P3 - Obligatory Triangle Problem
SAC Coding Challenge
5p
26.6%
173
SAC '22 Code Challenge 4 Junior P4 - Obligatory Permutation Problem
SAC Coding Challenge
7p
18.3%
102
SAC '22 Code Challenge 4 Junior P5 - Obligatory Output Only Problem
SAC Coding Challenge
10
24.6%
44
SAC '22 Code Challenge 4 P1 - Obligatory Car Problem
SAC Coding Challenge
3
35.7%
232
SAC '22 Code Challenge 4 P2 - Obligatory String Problem
SAC Coding Challenge
5
35.1%
149
SAC '22 Code Challenge 4 P3 - Obligatory Math Problem
SAC Coding Challenge
5
38.7%
209
SAC '22 Code Challenge 4 P4 - Obligatory Subarray Problem
SAC Coding Challenge
10p
22.1%
98
SAC '22 Code Challenge 4 P5 - Obligatory Interactive Problem
SAC Coding Challenge
12p
15.1%
57
SAC '22 Code Challenge 5 Junior P1 - Monkey, Type!
SAC Coding Challenge
3
67.6%
277
SAC '22 Code Challenge 5 Junior P2 - Badminton Scoring
SAC Coding Challenge
3
69.7%
330
SAC '22 Code Challenge 5 Junior P3 - Media List
SAC Coding Challenge
5p
38.4%
323
SAC '22 Code Challenge 5 Junior P4 - Course Requirements
SAC Coding Challenge
7p
51.2%
282
SAC '22 Code Challenge 5 Junior P5 - English Summative
SAC Coding Challenge
10p
26.9%
81
SAC '22 Code Challenge 5 P1 - Querying Plants
SAC Coding Challenge
3
66.2%
239
SAC '22 Code Challenge 5 P2 - Querying Extensions
SAC Coding Challenge
5p
71.7%
354
SAC '22 Code Challenge 5 P3 - Querying Presents
SAC Coding Challenge
7p
50.4%
107
SAC '22 Code Challenge 5 P4 - Querying Intervals
SAC Coding Challenge
10p
36.0%
121
SAC '22 Code Challenge 5 P5 - Querying Rectangles
SAC Coding Challenge
15p
15.5%
38
South African Computer Olympiad 2008 Day 1 Problem 3 - Visiting Grandma
Uncategorized
15p
15.5%
119
Sales
Uncategorized
20p
18.5%
67
Salsifa Hall
Uncategorized
7
51.9%
10
Sandwich
Uncategorized
5
33.9%
212
Sword Art Online Judge
Seasonal
7
14.0%
107
Sword Art Online Judge 2
Seasonal
10
6.4%
67
Sword Art Online Judge 3
Seasonal
7
13.4%
37
Super Boggle
Uncategorized
15p
13.3%
6
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