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Random
Hot problems
CCC '16 S4 - Combining Riceballs
Appleby Contest '19 P5 - Matrix Operation
Cheerio Contest 1 S2 - School Expansion
WC '96 P6 - Bases Multiplication
DMOPC '23 Contest 1 P1 - Peak Grid
Max's Anger Contest Series 2 P3 - Array Anger
CCCHK '15 J4 - Where to build my house?
Problem
Category
Points
AC % ▴
Users
CCO '10 P4 - Computer Purchase Return
CCO
10
39.1%
365
IOI '96 P1 - A Game
IOI
10
39.2%
270
Back From Summer '17 P1: Pithy Pastimes
Seasonal
3
39.2%
780
ECOO '17 R2 P4 - Zig Zag
ECOO
12p
39.2%
29
PEG Test '14 - Change
Uncategorized
7
39.3%
50
Graph Contest 3 P3 - Cable TV
Uncategorized
7
39.3%
188
3n+1
Uncategorized
3
39.3%
1699
DWITE '10 R5 #3 - Balancing Act
DWITE
7
39.3%
165
Valentine's Day '19 J1 - Rainbow Rating
Uncategorized
3
39.3%
509
ECOO '16 R1 P3 - Railway Sort
ECOO
7p
39.3%
331
COCI '15 Contest 6 #4 Parovi
COCI
12p
39.4%
77
GFSSOC '17 S1 - Path to Waterloo
GFSSOC
7
39.4%
160
COCI '18 Contest 1 #1 Nadan
COCI
3p
39.4%
166
NOI '04 P5 - Little H's Little Hut
China NOI
20p
39.4%
7
CCC '15 J4 - Wait Time
CCC
5
39.4%
1313
COCI '16 Contest 6 #4 Savršen
COCI
7p
39.4%
41
CCC '22 S1 - Good Fours and Good Fives
CCC
5p
39.4%
2130
COCI '12 Contest 4 #4 Razlika
COCI
12p
39.4%
22
Amplitude Hackathon '23 Practice Problem 5 - What is Spenser's Last Name?
Uncategorized
0p
39.4%
27
ECOO '18 R2 P1 - Artificial Photosynthesystem
ECOO
7p
39.5%
37
Budget
Uncategorized
3
39.5%
131
CCC '18 S2 - Sunflowers
CCC
5p
39.5%
2807
COCI '07 Contest 2 #2 Crne
COCI
3
39.5%
390
ICPC ECNA 2005 F - Square Count
ICPC
15
39.5%
20
NOI '97 P6 - Satellite Coverage
China NOI
12p
39.5%
27
IOI '06 P1 - Deciphering the Mayan Writing
IOI
7p
39.5%
433
ICPC SWERC 2017 A - Cakey McCakeFace
ICPC
5
39.6%
11
CCC '02 S1 - The Students' Council Breakfast
CCC
5
39.6%
1498
UCRPC F21 F - Trip Navigator
ICPC
12p
39.6%
33
Another Contest 4 Problem 7 - A Sack of Creatures
ACC
0
39.6%
44
COCI '13 Contest 2 #2 Misa
COCI
5p
39.6%
180
COCI '06 Contest 2 #3 Kolone
COCI
7
39.6%
282
BlueBook - Min
BlueBook
3
39.7%
705
GFSSOC '17 J2 - Admission Average
GFSSOC
3p
39.7%
395
Cheerio Contest 1 J2 - Phys Ed Class
Uncategorized
3
39.7%
136
BlueBook - Power Base
BlueBook
3
39.7%
546
DWITE '11 R5 #2 - Forest Fires
DWITE
7
39.7%
94
DWITE '09 R2 #5 - Portals Redux
DWITE
12
39.7%
23
Bill's Binoculars
Uncategorized
5
39.7%
51
COCI '11 Contest 3 #4 Robot
COCI
7
39.7%
25
DWITE '11 R3 #5 - Tautology
DWITE
10
39.7%
29
WC '18 Finals J1 - Conditional Contracts
Woburn Challenge
5p
39.7%
169
WC '17 Contest 2 S2 - Don't Follow the Lights
Woburn Challenge
12p
39.8%
36
COCI '15 Contest 5 #2 Multigram
COCI
5
39.8%
25
JOI '20 Open P3 - Power Plant
JOI
15p
39.8%
23
COCI '23 Contest 2 #5 Zatopljenje
COCI
15p
39.8%
32
DWITE '10 R3 #4 - Forest Fires
DWITE
7
39.8%
129
Triway Cup '19 Summer I - An Easy Problem
Seasonal
5
39.8%
75
NOIP '99 P1 - Missile Interception
China NOI
12p
39.8%
40
GFSSOC '15 Fall J4 - Marathon
GFSSOC
7p
39.8%
804
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