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Random
Hot problems
WC '01 P3 - Back to the Future
CCC '16 S4 - Combining Riceballs
GFSSOC '15 Winter S1 - OR-deal
DMOPC '17 Contest 4 P1 - Ribbon Colouring Fun
IOI '11 P2 - Race
Bubble Sort
ECOO '20 P2 - Online Shopping
Problem
Category
Points
AC % ▾
Users
UACC 1 P5 - A Lab Report
Uncategorized
10
14.3%
52
The Contest Contest 1 P2 - A Typical CCC Senior Problem
Uncategorized
10p
14.3%
177
Heap Dijkstra Revisited
Data Structure Tests
10
14.3%
10
OCC '19 G3 - Binary Game
Olympiads School
25p
14.3%
5
COCI '09 Contest 5 #6 Chuck
COCI
25p
14.3%
1
WC '15 Contest 3 S1 - Energy Absorption
Woburn Challenge
7p
14.3%
34
Google Code Jam '15 Qualification Round Problem D - Ominous Omino
Google Code Jam
12p
14.3%
3
TLE '17 Contest 8 P3 - Curious Numbers
TLE
10p
14.3%
70
DMOPC '21 Contest 10 P3 - Peculiar Reflections
DMOPC
12p
14.2%
75
DMOPC '21 Contest 3 P4 - Sorting Subsequences
DMOPC
20p
14.2%
32
CCO '16 P2 - Splitting Hares
CCO
15p
14.2%
89
Cheerio Contest 1 S4 - Mystery Boxes
Uncategorized
10p
14.2%
41
Mock CCO '18 Contest 4 Problem 1 - Mining for Minerals
Mock CCO
15p
14.2%
40
Another Contest 3 Problem 4 - Range Updates and Range Queries
ACC
15
14.2%
54
The Return of A Plus B
Seasonal
0p
14.2%
341
CCO '04 P4 - Return of Space Turtle
CCO
12
14.2%
46
TLE '16 Contest 6 (Mock CCC) J3 - Two Kangaroos
TLE
5p
14.2%
42
Mock CCC '24 Contest 1 S5 - Mock CCC 2025
Mock CCC
20p
14.2%
18
CCO '05 P6 - Windows
CCO
30p
14.2%
28
TLE '16 Contest 7 P2 - Judging
TLE
15p
14.2%
10
Baltic OI '04 P1 - Ships
Baltic OI
7p
14.2%
12
Geography Class
Uncategorized
5p
14.1%
67
CCC '18 S3 - RoboThieves
CCC
12p
14.1%
1135
PEG Test '14 - Gift Delivery
Uncategorized
10
14.1%
12
COCI '08 Contest 2 #6 Cavli
COCI
25p
14.1%
25
Wesley's Anger Contest 2 Problem 4 - The Ninth Triangle of the Underworld
WAC
20
14.1%
11
DMOPC '16 Contest 3 P3 - Phantom Fight
DMOPC
10p
14.1%
98
CCC '17 S4 - Minimum Cost Flow
CCC
17p
14.1%
771
CCC '10 S1 - Computer Purchase
CCC
5
14.1%
1328
DMOPC '18 Contest 1 P4 - Sorting
DMOPC
12p
14.1%
85
DMPG '16 S2 - Pandemic
DMOPC
7p
14.1%
85
DMOPC '15 Contest 6 P3 - Harvest
DMOPC
7p
14.1%
314
DMOPC '18 Contest 5 P2 - A Photography Problem
DMOPC
7
14.1%
127
BSSPC '21 J4 - James's Magical Soups
Uncategorized
7p
14.1%
92
NOIP '99 P2 - Palindrome Numbers
China NOI
7p
14.1%
25
IOI '16 P1 - Detecting Molecules (Standard I/O)
IOI
12p
14.1%
230
Amplitude Hackathon '23 Practice Problem 2 - Go Amplitude!
Uncategorized
5p
14.0%
19
DMOPC '23 Contest 1 P2 - Knights on Chessboard
DMOPC
10p
14.0%
197
Sword Art Online Judge
Seasonal
7
14.0%
101
Mock CCC '23 1 S5 - The Obligatory Data Structures Problem
Mock CCC
25p
14.0%
10
ECOO '12 R2 P2 - Password Strength
ECOO
5p
14.0%
20
DMOPC '22 Contest 1 P3 - Group Project
DMOPC
12p
14.0%
95
GFSSOC '15 Fall S5 - Raider
GFSSOC
17p
14.0%
137
Bubble Cup V9 I R3D3's summer adventure
Bubble Cup
25
14.0%
3
Back From Summer '17 P5: Confusing Codeforces Contest
Seasonal
25p
14.0%
29
A Simple Multiplication
Uncategorized
12
14.0%
17
Wesley's Anger Contest 6 Problem 4 - Runway Lights
WAC
12p
14.0%
87
MWC '15 #6 P3: Magical Sets
MWC
7p
14.0%
42
Mock CCO '18 Contest 2 Problem 3 - Victor Trains
Mock CCO
20p
14.0%
7
NOI '12 P2 - Highway Cycling
China NOI
25p
14.0%
15
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