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Hot problems
Back To School '16: Cherry Tree
CCC '25 J4 - Sunny Days
CCC '25 J3 - Product Codes
Baltic OI '19 P3 - Alpine Valley
CCC '11 S1 - English or French?
COCI '18 Contest 3 #1 Magnus
CCC '25 J5 - Connecting Territories
Problem
Category
Points
AC %
Users
CCC '00 J1 - Calendar
CCC
5p
11.2%
1526
CCC '00 J2 - 9966
CCC
3p
35.4%
2151
CCC '00 S1 - Slot Machines
CCC
5p
27.0%
5064
CCC '00 S2 - Babbling Brooks
CCC
7p
34.4%
2852
CCC '00 S3 - Surfing
CCC
7p
18.1%
693
CCC '00 S4 - Golf
CCC
7p
24.8%
2462
CCC '00 S5 - Sheep and Coyotes
CCC
10p
4.4%
205
CCC '00 S5 - Sheep and Coyotes (Hard)
CCC
20
6.4%
28
CCC '01 J1 - Dressing Up
CCC
3p
47.4%
3116
CCC '01 J2 - Mod Inverse
CCC
3p
43.2%
2749
CCC '01 S1 - Keeping Score
CCC
5p
32.9%
1662
CCC '01 S2 - Spirals
CCC
5p
40.4%
1004
CCC '01 S2 - Spirals (Exact Version)
CCC
7
8.5%
126
CCC '01 S3 - Strategic Bombing
CCC
7p
38.8%
1574
CCC '01 S4 - Cookies
CCC
10p
19.0%
462
CCC '01 S5 - Post's Correspondence Problem
CCC
10p
29.3%
345
CCC '02 J1 - 0123456789
CCC
3p
5.7%
840
CCC '02 J2 - AmeriCanadian
CCC
3p
25.4%
4336
CCC '02 S1 - The Students' Council Breakfast
CCC
5p
39.7%
1637
CCC '02 S2 - Fraction Action
CCC
5p
19.4%
2046
CCC '02 S3 - Blindfold
CCC
15p
6.4%
172
CCC '02 S4 - Bridge Crossing
CCC
10p
37.5%
961
CCC '02 S4 - Bridge Crossing (Hard)
CCC
20p
8.4%
38
CCC '02 S5 - Follow the Bouncing Ball
CCC
10p
11.3%
175
CCC '03 J1 - Trident
CCC
3p
29.0%
2592
CCC '03 J2 - Picture Perfect
CCC
3p
24.1%
1742
CCC '03 S1 - Snakes and Ladders
CCC
5p
20.7%
3274
CCC '03 S2 - Poetry
CCC
5p
17.6%
1587
CCC '03 S3 - Floor Plan
CCC
7p
27.8%
2099
CCC '03 S4 - Substrings
CCC
15p
7.9%
417
CCC '03 S5 - Trucking Troubles
CCC
10p
18.1%
752
CCC '04 J1 - Squares
CCC
3p
32.8%
6495
CCC '04 J2 - Terms of Office
CCC
3p
37.4%
3735
CCC '04 J3 - Smile with Similes
CCC
3p
57.4%
4353
CCC '04 J4 - Simple Encryption
CCC
5p
50.8%
1871
CCC '04 J5 - Fractals
CCC
10p
36.1%
242
CCC '04 S1 - Fix
CCC
5p
31.6%
1305
CCC '04 S2 - TopYodeller
CCC
5p
21.0%
801
CCC '04 S3 - Spreadsheet
CCC
10p
27.4%
657
CCC '04 S4 - Space Turtle
CCC
10p
20.0%
198
CCC '04 S5 - Super Plumber
CCC
10p
23.4%
451
CCC '05 J1 - The Cell Sell
CCC
3p
8.6%
1691
CCC '05 J2 - RSA Numbers
CCC
3p
40.8%
3202
CCC '05 J3 - Returning Home
CCC
5p
36.6%
2560
CCC '05 J4 - Cross Spiral
CCC
7p
31.9%
650
CCC '05 J5 - Bananas
CCC
10p
21.6%
1552
CCC '05 S1 - Snow Calls
CCC
5p
43.4%
2440
CCC '05 S2 - Mouse Move
CCC
5p
37.4%
1806
CCC '05 S3 - Quantum Operations
CCC
10p
34.0%
490
CCC '05 S4 - Pyramid Message Scheme
CCC
10p
35.1%
889
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