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Hot problems
CCC '24 S2 - Heavy-Light Composition
APIO '10 P1 - Commando
SAC '22 Code Challenge 5 P2 - Querying Extensions
Max's Anger Contest Series 2 P3 - Array Anger
CCC '12 S2 - Aromatic Numbers
CCO '07 P2 - Snowflakes
CCC '15 S3 - Gates
Problem
Category
Points ▴
AC %
Users
ICHB Selection Contest '17 Problem 1 - Airship Fights (Correct Version)
Uncategorized
30p
9.1%
2
Triway Cup '19 Summer H - Time Traveller Imaxblue
Seasonal
30
27.8%
28
CCO '19 P3 - Winter Driving
CCO
30p
17.3%
66
APIO '11 P3 - Guess My Word!
APIO
30p
23.9%
8
APIO '19 P2 - Bridges
APIO
30p
11.1%
48
IOI '19 P3 - Rectangles
IOI
30p
6.9%
25
CEOI '19 P4 - Amusement Park
CEOI
30p
20.8%
7
CEOI '19 P1 - Building Skyscrapers
CEOI
30p
6.9%
2
OCC '19 G4 - Willson and Fighting
Olympiads School
30p
3.5%
3
OCC '19 G6 - Monkeys in a Tree
Olympiads School
30p
10.0%
9
APIO '17 P1 - Land of the Rainbow Gold
APIO
30p
15.5%
14
Wesley's Anger Contest 2 Problem 6 - Haunted Houses
WAC
30
33.3%
6
Art Academy IV: Alice's Blazing Fury
Uncategorized
30p
12.2%
4
Wesley's Anger Contest 3 Problem 6 - Zeyu's Sadness Contest 1
WAC
30p
7.5%
8
DMOPC '19 Contest 7 P6 - Bob Equilibrium
DMOPC
30p
18.5%
51
DMOPC '19 Contest 6 P5 - University Math
DMOPC
30p
6.6%
11
Angie and Functions (Hard)
Uncategorized
30
2.1%
1
Wesley's Anger Contest 4 Problem 5 - Time Travelling Squirrels
WAC
30p
7.4%
8
JOI '18 Spring Camp Day 1 P1 - Construction of Highway
JOI
30p
34.0%
28
JOI '18 Spring Camp Day 1 P2 - Fences
JOI
30p
50.0%
1
CCO '20 P6 - Shopping Plans
CCO
30p
9.2%
40
CCO '06 P4 - CN Tower 2
CCO
30
5.4%
11
CCO '06 P5 - Domino
CCO
30
3.9%
3
CCO '06 P6 - Paint by Numbers
CCO
30
11.0%
9
NOI '14 P6 - Ticket Purchase
China NOI
30p
13.0%
37
NOI '06 P5 - The Clever Tour Guide
China NOI
30p
1.2%
7
NOI '08 P2 - Course Design
China NOI
30p
7.9%
12
NOI '07 P5 - Counting Spanning Trees
China NOI
30p
13.5%
11
NOI '08 P5 - Candy Rain
China NOI
30p
14.7%
10
NOI '12 P5 - Food Festival
China NOI
30p
20.9%
6
NOI '05 P6 - Lemon Tree Under the Moon
China NOI
30
15.7%
9
NOI '07 P2 - Cash Exchange
China NOI
30p
12.0%
24
NOI '05 P5 - Little H's Party
China NOI
30p
2.4%
3
NOI '13 P6 - Fast Food Restaurant
China NOI
30p
7.9%
11
NOI '13 P5 - Calligrapher
China NOI
30p
19.4%
6
NOI '14 P3 - Deletion Game
China NOI
30p
0.3%
1
NOI '11 P3 - Ali's Typewriter
China NOI
30p
29.9%
24
Bulgarian OI '09 P5 - Special Sequence
Bulgarian OI
30p
14.0%
27
IOI '02 P5 - Bus Terminals
IOI
30p
14.8%
53
IOI '04 P6 - Empodia
IOI
30p
16.8%
138
IOI '01 P6 - Depot
IOI
30p
12.1%
39
ICPC NEERC 2010 C - Cactus Revolution
ICPC
30p
10.0%
1
CCO '05 P6 - Windows
CCO
30p
14.2%
28
MMM '14 E - English Essay
Uncategorized
30p
1.5%
1
WC '15 Finals S5 - Supply Chain
Woburn Challenge
30p
9.8%
2
WC '15 Contest 3 S4 - Lex Luthor's Landmines
Woburn Challenge
30p
3.6%
6
WC '15 Contest 2 S4 - The Force Awakens (Senior)
Woburn Challenge
30p
6.8%
13
Wesley's Anger Contest 5 Problem 7 - Acorn Delivery System
WAC
30p
2.8%
7
Baltic OI '16 P3 - Spiral
Baltic OI
30p
13.3%
4
Wesley's Anger Contest 5 Problem 6 - Squirrel Cities 2
WAC
30p
7.7%
7
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