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Random
Hot problems
CCC '24 S2 - Heavy-Light Composition
Summer Institute '17 Contest 3 P5 - Balanced Cycles
Educational DP Contest AtCoder G - Longest Path
EGOI '23 P4 - Bikes vs Cars
DMOPC '19 Contest 2 P4 - A Greedy Problem
CCC '20 S4 - Swapping Seats
DMOPC '23 Contest 1 P1 - Peak Grid
Problem
Category
Points
AC % ▴
Users
NOI '15 P4 - Homeric Epics
China NOI
25p
25.8%
24
GlobeX Cup '18 J3 - Good Numbers
Uncategorized
5p
25.8%
163
COCI '12 Contest 5 #4 Hipercijevi
COCI
10p
25.8%
30
DMOPC '17 Contest 1 P1 - Fujō Neko
DMOPC
5p
25.8%
620
MEC '16 P1 - Bat-Doctor
Seasonal
5p
25.8%
40
DWITE '08 R5 #5 - Nash in Traffic
DWITE
10
25.8%
6
NOI '06 P1 - Network Charges
China NOI
20p
25.8%
24
Waterloo 2023 Fall A - Black Frame
Waterloo Local
12
25.8%
14
Mirrored Pairs
Uncategorized
3
25.8%
1317
CCC '19 S2 - Pretty Average Primes
CCC
5p
25.9%
2358
NOI '99 P1 - 01 Sequence
China NOI
20p
25.9%
12
WC '16 Finals J2 - Enigmoo
Woburn Challenge
5p
25.9%
31
EGOI '21 P2 - Luna Likes Love
EGOI
12p
25.9%
43
COCI '14 Contest 3 #5 Stogovi
COCI
15p
25.9%
197
DMOPC '20 Contest 2 P2 - Lousy Christmas Presents
DMOPC
5p
25.9%
416
DWITE '07 R5 #5 - Tetris!
DWITE
7
25.9%
6
Baltic OI '10 P5 - Candies
Baltic OI
17p
25.9%
19
MMCC '14 P2 - Kirito
Uncategorized
20p
25.9%
152
Back To School '18: An FFT Problem
Seasonal
10p
25.9%
111
DMOPC '13 Contest 1 P4 - AFK
DMOPC
7p
26.0%
802
Baltic OI '15 P3 - Network
Baltic OI
15p
26.0%
31
ECOO '14 R2 P4 - What Lies Ahead
ECOO
10p
26.0%
17
TLE '17 Contest 4 P3 - Fax's Christmas Dish
TLE
7p
26.0%
139
Cheerio Contest 1 S3 - Stock Trading
Uncategorized
7p
26.0%
52
MCIPC Contest 2 P5 - Holiday Chocolates
Uncategorized
10p
26.0%
7
CCC '21 S4 - Daily Commute
CCC
12p
26.0%
585
Favorite Numbers
Uncategorized
5
26.0%
119
WC '07 P5 - BitStrings
Woburn Challenge
10p
26.1%
32
COCI '20 Contest 3 #1 Knjige
COCI
7
26.1%
48
BlueBook - Equation
BlueBook
3
26.1%
797
OCC '19 S6 - City Tolls
Olympiads School
17p
26.1%
4
APIO '12 P1 - Dispatching
APIO
17p
26.1%
267
Checkerboard Summation (Easy)
Uncategorized
12p
26.1%
280
CCC '22 S2 - Good Groups
CCC
5p
26.1%
1561
Waterloo 2023 Fall C - Whitewater Rafting
Waterloo Local
17
26.2%
14
Andrew Needs Help
Uncategorized
12p
26.2%
29
ECOO '16 R1 P1 - Pass or Fail
ECOO
5p
26.2%
301
DMOPC '16 Contest 4 P1 - Fast Exponents
DMOPC
5p
26.2%
558
IOI '14 P5 - Friend
IOI
30p
26.2%
99
Mock CCC '18 Contest 5 J2 - Smallest Mode
Mock CCC
3p
26.2%
227
Amplitude Hackathon '23 Problem 2 - Gigatron Lag
Uncategorized
3p
26.2%
38
VMSS Pre-Windsor P7 - Going Back to the Definitions
Uncategorized
7
26.2%
458
CCO '98 P1 - Fibonacci Numbers
CCO
7
26.2%
158
TLE '16 Contest 1 P1 - Buying Paper
TLE
3p
26.3%
124
Knapsack 3
Uncategorized
10p
26.3%
253
DWITE '10 R5 #5 - Cube World
DWITE
12
26.3%
112
Yet Another Contest 4 P2 - Alchemy 2
YAC
7p
26.3%
164
JOI '14 Open P5 - Pinball
JOI
25p
26.3%
91
TLE '17 Contest 3 P2 - Sectors
TLE
3p
26.3%
96
VMSS '15 #5 - Jeffrey and Frank and a Lack of Roads
VM7WC
12
26.3%
67
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