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Random
Hot problems
COCI '14 Contest 6 #4 Kratki
ACSL '09 Practice P4 - Rank
IOI '00 P1 - Palindrome
CCC '17 S3 - Nailed It!
DMOPC '14 Contest 4 P3 - Golden Lily
DMOPC '17 Contest 4 P4 - Cops and Robbers
COCI '10 Contest 2 #2 Napor
Problem
Category
Points
AC %
Users ▾
Back To School '19: Unstable Books
Seasonal
15p
29.9%
32
APIO '08 P3 - DNA
APIO
15p
30.8%
32
IOI '19 P5 - Vision Program
IOI
20p
8.0%
32
Back From Summer '19 P5: ABC123E
Seasonal
17p
30.1%
32
DMOPC '19 Contest 1 P5 - Broken String
DMOPC
17
9.0%
32
COCI '19 Contest 6 #1 Datum
COCI
5p
36.4%
32
ACM U of T Tryouts C2 E - MVP
ICPC
15
27.2%
32
IOI '03 P2 - Comparing Code
IOI
25p
17.6%
32
COCI '09 Contest 5 #3 Kletva
COCI
7
21.5%
32
WC '18 Contest 4 J3 - Inventory
Woburn Challenge
5p
27.2%
32
WC '16 Contest 4 S3 - Night Howlers
Woburn Challenge
15p
20.6%
32
WC '18 Contest 4 S3 - Dance Royale
Woburn Challenge
15p
19.2%
32
WC '07 P5 - BitStrings
Woburn Challenge
10p
26.1%
32
DMOPC '20 Contest 1 P6 - Victor Identifies Software
DMOPC
25p
16.1%
32
Advanced Battleships
Uncategorized
15p
11.1%
32
Word Wrap Cypher
Uncategorized
7
35.8%
32
CCC '02 S4 - Bridge Crossing (Hard)
CCC
20
8.6%
32
James' XOR Update
Uncategorized
12p
27.9%
32
COCI '12 Contest 1 #4 Ljubomora
COCI
7p
41.7%
32
COCI '11 Contest 6 #3 Zagrade
COCI
7
28.5%
32
COCI '12 Contest 6 #2 Sume
COCI
7
60.3%
32
COCI '17 Contest 6 #2 Alkemija
COCI
10p
8.3%
32
DMOPC '20 Contest 5 P5 - Slacking Off Again
DMOPC
20p
17.6%
32
Subarray Search
Uncategorized
7
26.4%
32
K-th Minimum Number
Uncategorized
17
45.5%
32
DMOPC '21 Contest 3 P4 - Sorting Subsequences
DMOPC
20p
14.2%
32
Another Contest 9 Problem 3 - Sun & Moon
ACC
12
22.5%
32
Another Random Contest 1 P3 - Physics Olympics
Uncategorized
7p
31.3%
32
CCO '22 P5 - Phone Plans
CCO
20p
12.9%
32
Good Sets
Uncategorized
10p
27.2%
32
An Animal Contest 7 P5 - Squirrel Scheming
AAC
17p
13.6%
32
DMOPC '22 Contest 2 P6 - Yogyakarta Elevators
DMOPC
25p
9.1%
32
APIO '23 P1 - Cyberland
APIO
17p
9.0%
32
EGOI '23 P2 - Padel Prize Pursuit
EGOI
10p
20.4%
32
CSPC '15 #6 - Attendance
CSPC
7p
41.4%
31
ECOO '16 R2 P3 - BattleShip
ECOO
7p
33.6%
31
Power Distribution
Uncategorized
7p
14.7%
31
HCI '16 - Stacker
Uncategorized
15p
14.7%
31
COI '07 #2 Kolekcija
COCI
20p
10.8%
31
Google Kickstart '17 Round C Problem A - Ambiguous Cipher
Google Kick Start
7p
43.0%
31
COCI '08 Regional #3 Cijevi
COCI
10
33.3%
31
A Harder Game
Uncategorized
15p
8.5%
31
DWITE '08 R3 #3 - Unicorns and Teaspoons
DWITE
5
67.7%
31
DWITE '11 R2 #1 - Wandering Billy
DWITE
5
35.0%
31
ICPC PACNW 2016 I - Postman
ICPC
12
25.2%
31
Inaho II
Uncategorized
25p
13.8%
31
TLE '17 Contest 2 P3 - Willson and Migration
TLE
10p
7.2%
31
Inaho III
Uncategorized
17p
18.4%
31
Back To School '18: Trucking Troubles II
Seasonal
20p
29.7%
31
LKP '18 Contest 2 P6 - Reconstruction
Uncategorized
25
7.9%
31
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