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Random
Hot problems
CCC '24 S2 - Heavy-Light Composition
SAC '22 Code Challenge 5 P2 - Querying Extensions
Max's Anger Contest Series 2 P2 - Password Anger
Max's Anger Contest Series 2 P3 - Array Anger
CCC '12 S2 - Aromatic Numbers
The Cosmic Era P2 - Uneven Sand
CCC '20 J4 - Cyclic Shifts
Problem
Category
Points
AC %
Users ▾
IOI '12 P4 - Ideal City
IOI
25p
26.7%
11
Yet Another Contest 5 P5 - No More Concerts
YAC
20p
10.7%
11
Google Code Jam '08 Round 1A Problem A - Minimum Scalar Product
Google Code Jam
5p
68.4%
11
IOI '23 P5 - Overtaking
IOI
25p
6.1%
11
Waterloo 2023 Fall B - Orb Tent
Waterloo Local
17
30.0%
11
Catching Their Flights
Uncategorized
0p
3.4%
11
Phantom's Python Challenge
Uncategorized
40p
0.8%
10
CCO '07 P5 - Particle Catcher
CCO
30p
16.3%
10
CCO Preparation Test 1 P1 - Double Cross
Mock CCO
20p
12.1%
10
ECOO '15 R2 P2 - So So
ECOO
12p
17.2%
10
ECOO '16 R3 P1 - Nerd Poker
ECOO
7p
12.2%
10
COCI '15 Contest 2 #6 Država
COCI
25
24.2%
10
ICPC NAQ 2016 B - Arcade!
ICPC
15
24.8%
10
TLE '16 Contest 7 P2 - Judging
TLE
15p
14.2%
10
TLE '16 Contest 7 P5 - Shortest Path Faster Algorithm
TLE
20p
2.8%
10
Google Kickstart '17 Round C Problem C - Magical Thinking
Google Kick Start
10p
20.0%
10
DWITE '07 R4 #3 - Don't follow my links
DWITE
5
54.9%
10
DWITE '10 R3 #5 - E-Searching
DWITE
7
42.4%
10
DWITE '12 R1 #5 - Haunted House
DWITE
10
44.4%
10
DWITE '11 R2 #3 - Anonymous Shopping
DWITE
5
40.0%
10
TLE '17 Contest 2 P5 - Crew Selection Test
TLE
25p
7.8%
10
DMOPC '17 Contest 4 P6 - Best Girl
DMOPC
25p
15.4%
10
Heap Dijkstra Revisited
Data Structure Tests
10
14.3%
10
CTU Open Contest 2017 - Shooting Gallery
ICPC
10
17.0%
10
ECOO '18 R2 P4 - Three Squares
ECOO
15p
35.1%
10
IOI '18 P6 - Meetings
IOI
35p
12.0%
10
Inaho VIII
Uncategorized
20
36.6%
10
DMOPC '18 Contest 4 P6 - Dr. Henri and Resistor Chains
DMOPC
20p
4.2%
10
Valentine's Day '19 S5 - A Top Tree Problem
Uncategorized
25p
9.7%
10
CTU Open Contest 2018 - Rullete
ICPC
10
19.4%
10
COCI '18 Contest 1 #5 Teoretičar
COCI
35p
31.7%
10
COCI '18 Contest 6 #2 Konj
COCI
7p
61.1%
10
CPC '19 Contest 1 P6 - Maintaining Some Coins
Uncategorized
20p
1.9%
10
CCO '99 P6 - Fast Food
CCO
15
34.4%
10
DMPG '19 G4 - Carpet Cleaning Chore
DMOPC
12p
13.0%
10
Wesley's Anger Contest 2 Problem 5 - Oober Treats
WAC
25
21.6%
10
Bohemian Rhaksody
Uncategorized
45p
5.0%
10
Wesley++
Seasonal
15p
15.2%
10
COCI '19 Contest 2 #1 ACM
COCI
5p
52.4%
10
Tootsie Rolls
Classics
12p
22.2%
10
NOI '00 P2 - Program Parser
China NOI
12p
11.5%
10
NOI '08 P5 - Candy Rain
China NOI
30p
14.7%
10
NOI '11 P2 - Intelligent Car Racing
China NOI
25p
12.2%
10
NOI '12 P3 - Magic Chessboard
China NOI
40p
6.2%
10
NOI '12 P4 - Lost in the Park
China NOI
20p
10.9%
10
IOI '95 Practice Task 1 - Fence Factory
IOI
15p
21.7%
10
IOI '99 P2 - Hidden Codes
IOI
20p
14.4%
10
NOI '19 P6 - Explore
China NOI
25p
2.6%
10
COCI '12 Contest 1 #3 Koncert
COCI
7
25.4%
10
WC '17 Contest 2 S4 - One Does Not Simply Walk Into Mordor
Woburn Challenge
17p
16.5%
10
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