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Hot problems
CCC '25 J3 - Product Codes
CCC '25 J5 - Connecting Territories
CCC '25 J4 - Sunny Days
Longest Increasing Subsequence
COCI '15 Contest 2 #1 Marko
Longest Increasing Subsequence
CCC '06 S2 - Attack of the CipherTexts
Problem
Category
Points
AC %
Users
Valentine's Day '15 P1 - #1 BABE
Seasonal
10p
3.0%
3
Valentine's Day '15 P2 - Simon and Marcy
Seasonal
7p
54.1%
696
Valentine's Day '15 P3 - The Great Escape
Seasonal
10p
27.5%
38
Valentine's Day '18 J1 - The Cactus Number
Mock CCC
3p
35.7%
222
Valentine's Day '18 J2 - Stop the Scammer
Mock CCC
5p
31.7%
127
Valentine's Day '18 J3 - Are they cute?
Mock CCC
5p
18.4%
174
Valentine's Day '18 J4 & S1 - Carol's Cute Cactus
Mock CCC
7
36.5%
196
Valentine's Day '18 J5 & S2 - Ctudor's Cute Orchids
Mock CCC
7
26.5%
160
Valentine's Day '18 S3 - Carol's Cactesian Conquest
Mock CCC
17p
40.6%
37
Valentine's Day '18 S4 - Coastal California Cities
Mock CCC
7p
44.0%
44
Valentine's Day '18 S5 - Carol's Calculating Continuity
Mock CCC
20
22.8%
38
Valentine's Day '19 J1 - Rainbow Rating
Uncategorized
3
39.8%
524
Valentine's Day '19 J2 - Pink!
Uncategorized
3p
60.6%
571
Valentine's Day '19 J3 - Love!
Uncategorized
7p
27.7%
340
Valentine's Day '19 J4 - Flowers
Uncategorized
5
18.4%
68
Valentine's Day '19 J5 - Falling in Love
Uncategorized
7p
14.1%
95
Valentine's Day '19 S1 - Voting
Uncategorized
5p
22.8%
107
Valentine's Day '19 S2 - Ctudor's Cute Cacti
Uncategorized
7p
19.4%
163
Valentine's Day '19 S3 - Mathematical English
Uncategorized
12p
8.0%
40
Valentine's Day '19 S4 - A Greedy Spouse
Uncategorized
15p
11.1%
32
Valentine's Day '19 S5 - A Top Tree Problem
Uncategorized
25p
9.1%
11
Vending Machine
Uncategorized
10p
41.7%
76
Virtuoso
Uncategorized
15
21.5%
41
VMSS '15 #0 - Head Data Slave Applications
VM7WC
10
25.4%
63
VMSS '15 #1 - Senpai, Help Me
VM7WC
5
27.8%
237
VMSS '15 #2 - Tomb Robbing
VM7WC
7
50.2%
429
VMSS '15 #3 - Jeffrey and Roads
VM7WC
7
25.6%
87
VMSS '15 #4 - Frank and Roads
VM7WC
10
36.0%
487
VMSS '15 #5 - Jeffrey and Frank and a Lack of Roads
VM7WC
12
26.0%
71
VM7WC '15 #1 Bronze - Goon
VM7WC
3
39.1%
566
VM7WC '15 #1 Silver - Jung Goon
VM7WC
5
45.2%
218
VM7WC '15 #1 Gold - JHK
VM7WC
10
29.1%
131
VM7WC '15 #2 Bronze - Recruits!
VM7WC
3
28.3%
371
VM7WC '15 #2 Silver - 4 Nations, 1 Secret
VM7WC
10
22.3%
231
VM7WC '15 #2 Gold - Uniting the Earth Empire
VM7WC
12
20.8%
329
VM7WC '15 #3 Bronze - M's Theorem!
VM7WC
5
21.3%
72
VM7WC '15 #3 Silver - Test Scores
VM7WC
5
31.1%
391
VM7WC '15 #3 Gold - Pollos
VM7WC
12
15.9%
50
VM7WC '15 #4 Bronze - Melanie's Cradles
VM7WC
3
41.3%
144
VM7WC '15 #4 Gold - Chain Rule
VM7WC
10
37.0%
417
VM7WC '15 #5 Bronze - Melanioana
VM7WC
3
29.3%
120
VM7WC '15 #5 Gold - Tree Planting
VM7WC
12
23.8%
235
VM7WC '15 #6 Gold - Agriphilosophical Data Slaves
VM7WC
7
27.4%
175
VM7WC '16 #1 Bronze - A New Prime Factorization
VM7WC
5
31.6%
423
VM7WC '16 #1 Silver - Project Feng: Multiple Statements
VM7WC
5
18.0%
101
VM7WC '16 #1 Gold - Russian Palindrome Cultivation
VM7WC
10
10.2%
57
VM7WC '16 #2 Bronze - G
VM7WC
5
66.9%
264
VM7WC '16 #2 Silver - GG
VM7WC
5
28.3%
478
VM7WC '16 #2 Gold - GGG
VM7WC
15
18.2%
318
VM7WC '16 #3 Bronze - Shahir-in-a-Box
VM7WC
3
45.3%
183
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