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Random
Hot problems
CCC '24 S2 - Heavy-Light Composition
Max's Anger Contest Series 2 P3 - Array Anger
CCO '07 P2 - Snowflakes
CCC '24 J4 - Troublesome Keys
Problem
Category
Points
AC %
Users ▾
Next Prime (Hard)
Classics
15
7.9%
159
DMPG '17 B5 - Hackathons
DMOPC
7p
15.9%
159
COCI '07 Contest 1 #2 PEG
COCI
5
47.8%
159
COCI '07 Contest 3 #4 Dejavu
COCI
7p
34.9%
159
Valentine's Day '18 J5 & S2 - Ctudor's Cute Orchids
Mock CCC
7
27.7%
159
COCI '15 Contest 5 #3 Perica
COCI
10p
29.4%
159
Wesley's Anger Contest Reject 5 - Two Permutations
WAC
5p
18.1%
159
DMOPC '14 Contest 1 P4 - Perfect Timing
DMOPC
5p
25.2%
158
CCC '97 S3 - Double Knockout Competition
CCC
5
10.0%
158
Inaho IV
Uncategorized
5p
48.5%
158
CCO '98 P1 - Fibonacci Numbers
CCO
7
26.2%
158
Another Contest 4 Problem 5 - Prime Time Television
ACC
0
62.7%
158
COCI '18 Contest 4 #2 Wand
COCI
7p
30.6%
158
2-D Permutations
Uncategorized
10p
20.6%
158
CCC '11 S4 - Blood Distribution
CCC
15p
7.7%
157
CCCJQR P3
Seasonal
7
8.7%
157
DMOPC '16 Contest 2 P3 - Queries
DMOPC
7
49.8%
157
COCI '06 Contest 5 #6 Dvaput
COCI
15p
11.7%
157
TLE '16 Contest 8 P1 - Paper Hole Punching
TLE
3p
32.2%
157
DWITE '08 R4 #4 - Shortest path around v2
DWITE
7
46.8%
157
Triway Cup '18 Summer F - Forget Me Not
Seasonal
5
24.8%
157
UCC Coding Competition '20 P1 - Snowstorm
Uncategorized
3
62.6%
157
BPC 1 S1 - Homework Questions
Uncategorized
5
17.1%
157
ICPC ECNA 2005 H - Two Ends
ICPC
10
35.1%
156
COCI '08 Contest 3 #5 BST
COCI
20p
26.7%
156
DWITE '07 R3 #1 - Yet Another Primes Question
DWITE
5
58.2%
156
Wesley's Anger Contest Reject 2 - 🥕suba
WAC
3
72.1%
156
SGS Programming Challenge P1 - XOR in Computer Class
Uncategorized
7p
13.3%
156
CSPC '15 #2 - Build Season
CSPC
3
40.1%
155
IOI '16 P1 - Detecting Molecules
IOI
12p
11.8%
155
DWITE '08 R1 #4 - What is this Roman Numeral
DWITE
7
62.0%
155
BSSPC '21 S3 - James's Egirl Discord Status
Uncategorized
7p
21.8%
155
JOI '14 Open P1 - Factories
JOI
20p
33.1%
154
CCO Preparation Test 1 P3 - K-th Rank Student
Mock CCO
17p
34.7%
154
WOSS Dual Olympiad 2022 J3/S1: Christmas List
Seasonal
5p
58.6%
154
TSOC '16 Contest 1 #2 - Johnny and Garden
TSOC
5p
37.0%
153
NOI '14 P1 - Getting-Up Syndrome
China NOI
10p
27.0%
153
Bob's Rocks
Uncategorized
5
47.4%
153
DMOPC '20 Contest 4 P2 - Beautiful Grids
DMOPC
7p
17.3%
153
MMCC '14 P2 - Kirito
Uncategorized
20p
25.9%
152
New Year's '15 P3 - Gift Wrap
Seasonal
5
61.3%
152
TLE '16 Contest 6 (Mock CCC) S3 - Hyper Fax
TLE
15p
17.1%
152
TLE '16 Contest 7 P4 - Abstract Problem
TLE
10p
19.8%
152
COCI '07 Contest 1 #3 Prinova
COCI
7p
16.4%
152
TLE '17 Contest 1 P2 - Willson and Food
TLE
5p
15.6%
152
Valentine's Day '19 S2 - Ctudor's Cute Cacti
Uncategorized
7p
19.3%
152
CCO '21 P1 - Swap Swap Sort
CCO
17p
16.8%
152
DMOPC '21 Contest 9 P2 - String Puzzle
DMOPC
7p
24.7%
152
DMOPC '21 Contest 10 P2 - Cycle Sort
DMOPC
7p
11.5%
152
Mock CCC '15 S1 - Dupvoting
Mock CCC
5p
18.3%
151
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