Home
Problems
Submissions
Users
Contests
About
>
Status
Tips
API
Github
Log in
or
Sign up
This site works best with JavaScript enabled.
Problems
«
1
2
...
47
48
49
50
51
52
...
102
103
»
Problem search
Full text search
Has editorial
Show problem types
Category
All
---
AAC
ACC
APIO
Balkan OI
Baltic OI
BlueBook
Brazil OI
Bubble Cup
Bulgarian OI
CCC
CCO
CEOI
China NOI
Classics
COCI
CSPC
CTF
Data Structure Tests
DMOPC
DWITE
ECOO
EGOI
ESOI
FHC
Fun Math
GFSSOC
Google Code Jam
Google Hash Code
Google Kick Start
ICPC
IOI
JOI
Mock CCC
Mock CCO
MWC
Olympiads School
POI
SAC Coding Challenge
Seasonal
SIUCF
Taiwan NOI
TLE
TSOC
Uncategorized
VM7WC
WAC
Waterloo Local
Woburn Challenge
YAC
All
Point range
0
50
Go
Random
Hot problems
CCC '25 S2 - Cryptogram Cracking Club
CCC '25 J5 - Connecting Territories
CCO '18 P1 - Geese vs. Hawks
Baltic OI '17 P6 - Cat in a tree
Arcadia Computing Contest 2 P5 - lp0 is on fire!
Baltic OI '14 P5 - Portals
IOI '08 P1 - Type Printer
Problem
Category
Points
AC %
Users
Educational DP Contest AtCoder K - Stones
Uncategorized
10
52.9%
482
Educational DP Contest AtCoder L - Deque
Uncategorized
10
54.4%
483
Educational DP Contest AtCoder M - Candies
Uncategorized
12
35.0%
303
Educational DP Contest AtCoder N - Slimes
Uncategorized
12
47.6%
436
Educational DP Contest AtCoder O - Matching
Uncategorized
12
57.1%
381
Educational DP Contest AtCoder P - Independent Set
Uncategorized
12
36.4%
345
Educational DP Contest AtCoder Q - Flowers
Uncategorized
15
50.0%
299
Educational DP Contest AtCoder R - Walk
Uncategorized
15
61.4%
148
Deemo's Problem
Uncategorized
15
13.6%
108
Educational DP Contest AtCoder S - Digit Sum
Uncategorized
12
33.1%
142
Educational DP Contest AtCoder T - Permutation
Uncategorized
15
59.0%
124
Educational DP Contest AtCoder U - Grouping
Uncategorized
15
38.0%
100
Educational DP Contest AtCoder V - Subtree
Uncategorized
20
29.0%
116
Educational DP Contest AtCoder W - Intervals
Uncategorized
20
46.5%
87
Educational DP Contest AtCoder X - Tower
Uncategorized
20
50.5%
86
Educational DP Contest AtCoder Y - Grid 2
Uncategorized
17
32.9%
116
Educational DP Contest AtCoder Z - Frog 3
Uncategorized
20
37.3%
176
Division Queries and Updates
Uncategorized
20p
24.6%
30
Binary Indexed Tree Test
Data Structure Tests
10p
29.1%
785
Disjoint Set Test
Data Structure Tests
10
37.2%
958
Segment Tree Test
Data Structure Tests
15p
16.2%
381
Binary Search Tree Test
Data Structure Tests
15
38.3%
207
Dynamic Tree Test
Data Structure Tests
45
30.8%
42
Dynamic Tree Test (Easy)
Data Structure Tests
25p
32.0%
64
String Test
Data Structure Tests
50
2.1%
2
DS '19 Day 1 P1 - Arithmetic Square
Seasonal
20p
5.5%
2
DS '19 Day 2 P3 Inaho C
Seasonal
35p
14.8%
7
Diagnostic Test '16 Level 1 P1 - StarMath
Uncategorized
3
28.3%
125
Diagnostic Test '16 Level 1 P2 - FaxPrimes
Uncategorized
5
52.1%
119
Diagnostic Test '16 Level 1 P3 - Faxen Words
Uncategorized
5
30.2%
65
Diagnostic Test '16 Level 2 P1 - Polan cannot into space
Uncategorized
3
49.1%
134
Diagnostic Test '16 Level 2 P2 - Gibe clays
Uncategorized
3
34.6%
84
Diagnostic Test '16 Level 2 P3 - Remove Cancer
Uncategorized
3
52.6%
127
DWITE '02 R2 #1 - Sales!
DWITE
5
31.8%
93
DWITE '02 R2 #2 - The Five M's of Stats 101
DWITE
5
30.9%
114
DWITE '02 R2 #3 - The Game of Life
DWITE
7
50.4%
103
DWITE '02 R2 #4 - Money Prize
DWITE
10
39.0%
62
DWITE '02 R2 #5 - Now I know my ABCs
DWITE
5
39.5%
139
DWITE '06 R5 #1 - Points on a Line
DWITE
7
35.8%
80
DWITE '06 R5 #2 - Floppy Disk
DWITE
7p
56.7%
112
DWITE '06 R5 #3 - UPC Check Digit
DWITE
5
39.1%
109
DWITE '06 R5 #4 - Connect-4
DWITE
7
56.1%
45
DWITE '06 R5 #5 - Prime Palindromes
DWITE
10
26.6%
265
DWITE '07 R1 #1 - Vanilla Primes
DWITE
3
24.6%
694
DWITE '07 R1 #2 - Cubes in a Pyramid
DWITE
3p
17.7%
376
DWITE '07 R1 #3 - Where's my QWERTY?
DWITE
3
41.7%
104
DWITE '07 R1 #4 - Stacks of Blocks
DWITE
5
36.2%
263
DWITE '07 R1 #5 - Velociraptor Maze
DWITE
7
14.0%
44
DWITE '07 R2 #1 - Not Quite Prime
DWITE
5
57.6%
355
DWITE '07 R2 #2 - Show Me The Money!
DWITE
3
35.0%
160
«
1
2
...
47
48
49
50
51
52
...
102
103
»