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Random
Hot problems
DWITE '10 R3 #3 - Dominos Tiling
Counting Subsequences
A Math Contest P5 - Good Arrays
ECOO '13 R1 P1 - Take a Number
CCC '24 J3 - Bronze Count
CCC '24 J5 - Harvest Waterloo
WC '96 P6 - Bases Multiplication
Problem
Category
Points
AC %
Users ▴
GlobeX Cup '19 J2 - Winnie Waifu Wars
Uncategorized
3p
15.4%
47
NOI '01 P2 - Artillery Positioning
China NOI
20p
29.7%
47
King Graff's Trip
Uncategorized
15p
8.2%
47
Sum Maximization
Uncategorized
10p
22.8%
47
COCI '20 Contest 2 #2 Odašiljači
COCI
10p
20.1%
47
COCI '20 Contest 3 #4 Selotejp
COCI
15p
40.8%
47
COCI '16 Contest 5 #5 Poklon
COCI
17p
40.5%
47
QCC P3 - Cohorts
Uncategorized
10p
37.0%
47
An Animal Contest 3 P6 - Monkey Station
AAC
17
13.8%
47
The Contest Contest 1 P3 - A Typical WAC Problem
Uncategorized
15p
17.4%
47
Factors
Uncategorized
7
8.9%
47
BPC 1 S2 - Train Commute
Uncategorized
12p
6.6%
47
COCI '22 Contest 1 #5 Neboderi
COCI
15p
25.5%
47
WOSS Dual Olympiad 2023 Team Round P1: Combining Candy Canes
Uncategorized
5
32.0%
47
VM7WC '15 #3 Gold - Pollos
VM7WC
12
15.9%
48
DMPG '15 G4 - Spacetime Convergence Cannons
DMOPC
17p
11.3%
48
Bad Paths
Uncategorized
12p
21.4%
48
Polynomial Time Boolean Satisfiability
Uncategorized
15p
37.7%
48
ECOO '18 R2 P3 - Factorial
ECOO
12p
16.6%
48
Fast Bit Duplication
Uncategorized
10
32.3%
48
COCI '09 Contest 1 #5 Genijalac
COCI
12p
39.9%
48
Fast LCA
Uncategorized
12
22.8%
48
Bulgarian OI '09 P6 - Diamonds
Bulgarian OI
12
22.9%
48
Baltic OI '05 P3 - Maze
Baltic OI
12
30.6%
48
COCI '20 Contest 3 #1 Knjige
COCI
7
26.1%
48
COCI '11 Contest 1 #4 Ples
COCI
10p
40.6%
48
COCI '16 Contest 6 #3 Turnir
COCI
7
38.7%
48
DMOPC '21 Contest 1 P4 - Uneven Forest
DMOPC
20
27.7%
48
A Math Contest P10 - Tricky Multisets
Uncategorized
12
26.2%
48
WOSS Dual Olympiad 2022 Team Round P2: Bobby's Studying Schedule
Seasonal
5
58.5%
48
Wesley's Anger Contest Reject 4 - GPS
WAC
10p
13.9%
48
Singularity Cup P5 - Perfect Matrix
Uncategorized
20
21.7%
48
COCI '23 Contest 1 #2 Labirint
COCI
10p
35.4%
48
IOI '14 P1 - Rail
IOI
30p
10.7%
49
CCO Preparation Test 4 P3 - Dynamic MST
Mock CCO
25p
22.1%
49
COCI '08 Contest 1 #6 Krtica
COCI
25p
10.1%
49
COCI '17 Contest 4 #1 Rasvjeta
COCI
3p
28.8%
49
Mock CCO '18 Contest 2 Problem 5 - Victor's Triangles
Mock CCO
20p
33.2%
49
DMOPC '18 Contest 2 P5 - Another Sequence Problem
DMOPC
15p
12.7%
49
COCI '13 Contest 2 #3 Slom
COCI
7p
36.1%
49
APIO '19 P2 - Bridges
APIO
30p
11.2%
49
Mighty Cactus
Uncategorized
7
12.0%
49
Wesley's Anger Contest 2 Problem 2 - Costume Shopping
WAC
10
11.6%
49
PEG Test '14 - Air
Uncategorized
7
21.4%
49
WC '18 Contest 2 J4 - Ammunition
Woburn Challenge
7p
21.0%
49
WC '15 Contest 1 S4 - Chocolate Milk
Woburn Challenge
20p
33.2%
49
WC '17 Contest 3 S1 - Mutual Friends
Woburn Challenge
10p
35.9%
49
WC '16 Finals J1 - Fencing
Woburn Challenge
5p
59.6%
49
DMOJ Capture The Flag '20 B1 - Super Secure Pseudorandom Number Generator
CTF
5
16.9%
49
Dominoes
Uncategorized
25
9.1%
49
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