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Hot problems
Baltic OI '09 P1 - Beetle
COCI '15 Contest 4 #3 Deathstar
DWITE '07 R2 #1 - Not Quite Prime
COCI '20 Contest 6 #1 Bold
CCC '09 S2 - Lights Going On and Off
CCO '10 P4 - Computer Purchase Return
DMOPC '21 Contest 5 P2 - Permutations & Primes
Problem
Category
Points
AC %
Users
CCC '00 S2 - Babbling Brooks
CCC
7
34.1%
2542
CCC '00 S3 - Surfing
CCC
7
17.5%
621
CCC '00 S4 - Golf
CCC
7
24.5%
2314
CCC '00 S5 - Sheep and Coyotes
CCC
10p
4.1%
178
CCC '00 S5 - Sheep and Coyotes (Hard)
CCC
20
6.2%
22
CCC '01 J1 - Dressing Up
CCC
3
48.2%
2884
CCC '01 J2 - Mod Inverse
CCC
3
43.0%
2552
CCC '01 S1 - Keeping Score
CCC
5
32.7%
1507
CCC '01 S2 - Spirals
CCC
5
41.3%
914
CCC '01 S2 - Spirals (Exact Version)
CCC
7
8.3%
105
CCC '01 S3 - Strategic Bombing
CCC
7
38.7%
1460
CCC '01 S4 - Cookies
CCC
10
19.1%
418
CCC '01 S5 - Post's Correspondence Problem
CCC
10
28.9%
315
CCC '02 J1 - 0123456789
CCC
3
5.4%
725
CCC '02 J2 - AmeriCanadian
CCC
3
25.1%
3895
CCC '02 S1 - The Students' Council Breakfast
CCC
5
39.7%
1502
CCC '02 S2 - Fraction Action
CCC
5
19.0%
1888
CCC '02 S3 - Blindfold
CCC
15
6.1%
150
CCC '02 S4 - Bridge Crossing
CCC
10p
37.3%
900
CCC '02 S4 - Bridge Crossing (Hard)
CCC
20
8.6%
33
CCC '02 S5 - Follow the Bouncing Ball
CCC
10
13.8%
190
CCC '03 J1 - Trident
CCC
3
28.6%
2334
CCC '03 J2 - Picture Perfect
CCC
3p
23.8%
1618
CCC '03 S1 - Snakes and Ladders
CCC
5
20.5%
3112
CCC '03 S2 - Poetry
CCC
5
17.3%
1460
CCC '03 S3 - Floor Plan
CCC
7
27.8%
1961
CCC '03 S4 - Substrings
CCC
15p
7.7%
374
CCC '03 S5 - Trucking Troubles
CCC
10p
17.6%
686
CCC '04 J1 - Squares
CCC
3
32.5%
6143
CCC '04 J2 - Terms of Office
CCC
3
37.4%
3518
CCC '04 J3 - Smile with Similes
CCC
3
57.8%
3983
CCC '04 J4 - Simple Encryption
CCC
5
50.9%
1719
CCC '04 J5 - Fractals
CCC
10
35.7%
220
CCC '04 S1 - Fix
CCC
5
32.7%
1204
CCC '04 S2 - TopYodeller
CCC
5
21.5%
738
CCC '04 S3 - Spreadsheet
CCC
10
27.1%
617
CCC '04 S4 - Space Turtle
CCC
10p
19.7%
185
CCC '04 S5 - Super Plumber
CCC
10p
23.8%
402
CCC '05 J1 - The Cell Sell
CCC
3
8.0%
1455
CCC '05 J2 - RSA Numbers
CCC
3
40.8%
2985
CCC '05 J3 - Returning Home
CCC
5
37.2%
2367
CCC '05 J4 - Cross Spiral
CCC
7p
32.7%
582
CCC '05 J5 - Bananas
CCC
10
21.6%
1473
CCC '05 S1 - Snow Calls
CCC
5
43.3%
2281
CCC '05 S2 - Mouse Move
CCC
5
37.3%
1689
CCC '05 S3 - Quantum Operations
CCC
10p
34.8%
440
CCC '05 S4 - Pyramid Message Scheme
CCC
10
35.7%
819
CCC '05 S5 - Pinball Ranking
CCC
12p
19.5%
742
CCC '06 J1 - Canadian Calorie Counting
CCC
3
27.4%
7254
CCC '06 J2 - Roll the Dice
CCC
3
27.1%
3044
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