Enter
|
Register
Home
Top
Catalog
Contests
Gym
Problemset
Groups
Rating
Edu
API
Calendar
Help
→ Pay attention
Before contest
Codeforces Round (Div. 1 + Div. 2)
2 days
Register now »
*has extra registration
→ Filter Problems
Difficulty:
—
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
constructive algorithms
data structures
dfs and similar
divide and conquer
dp
dsu
expression parsing
fft
flows
games
geometry
graph matchings
graphs
greedy
hashing
implementation
interactive
math
matrices
meet-in-the-middle
number theory
probabilities
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
Add tag
Main
acmsguru
|
Problems
Submit
Status
Standings
Custom test
Problems
#
Name
1841B
Keep it Beautiful
implementation
1000
x20654
1841A
Game with Board
constructive algorithms
,
games
800
x24267
1840G2
In Search of Truth (Hard Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2500
x902
1840G1
In Search of Truth (Easy Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2200
x2243
1840F
Railguns
brute force
,
dfs and similar
,
dp
,
graphs
2200
x1714
1840E
Character Blocking
data structures
,
hashing
,
implementation
1600
x7592
1840D
Wooden Toy Festival
binary search
,
greedy
,
sortings
1400
x12943
1840C
Ski Resort
combinatorics
,
math
,
two pointers
1000
x24838
1840B
Binary Cafe
bitmasks
,
combinatorics
,
math
1100
x21585
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x32746
1839E
Decreasing Game
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
interactive
2400
x1163
1839D
Ball Sorting
data structures
,
dp
,
sortings
2100
x2185
1839C
Insert Zero and Invert Prefix
constructive algorithms
1300
x11410
1839B
Lamps
greedy
,
sortings
1100
x14520
1839A
The Good Array
greedy
,
implementation
,
math
800
x17119
1838F
Stuck Conveyor
binary search
,
constructive algorithms
,
interactive
3000
x302
1838E
Count Supersequences
combinatorics
,
dp
,
math
2500
x1378
1838D
Bracket Walk
data structures
,
greedy
,
strings
2100
x3090
1838C
No Prime Differences
constructive algorithms
,
math
,
number theory
1400
x13533
1838B
Minimize Permutation Subarrays
constructive algorithms
,
math
1100
x15863
1838A
Blackboard List
constructive algorithms
,
math
800
x21102
1837F
Editorial for Two
binary search
,
data structures
,
greedy
,
implementation
2400
x2080
1837E
Playoff Fixing
combinatorics
,
trees
2200
x2108
1837D
Bracket Coloring
constructive algorithms
,
greedy
1400
x13530
1837C
Best Binary String
constructive algorithms
,
greedy
1000
x21185
1837B
Comparison String
greedy
900
x26785
1837A
Grasshopper on a Line
constructive algorithms
,
math
800
x29357
1836B
Astrophysicists
greedy
,
math
1100
x12294
1836A
Destroyer
implementation
,
sortings
800
x19815
1835F
Good Graph
bitmasks
,
dfs and similar
,
graph matchings
,
graphs
,
implementation
3500
x145
1835E
Old Mobile
combinatorics
,
dp
,
probabilities
3500
x203
1835D
Doctor's Brown Hypothesis
dfs and similar
,
graphs
,
math
,
number theory
2900
x451
1835C
Twin Clusters
bitmasks
,
brute force
,
constructive algorithms
,
math
,
probabilities
2600
x941
1835B
Lottery
binary search
,
brute force
,
greedy
,
math
,
two pointers
2500
x906
1835A
k-th equality
brute force
,
implementation
,
math
1700
x7476
1834F
Typewriter
brute force
,
math
2500
x488
1834E
MEX of LCM
binary search
,
data structures
,
implementation
,
math
,
number theory
2300
x2078
1834D
Survey in Class
brute force
,
data structures
,
greedy
,
implementation
,
sortings
1900
x4370
1834C
Game with Reversing
games
,
greedy
,
math
,
strings
1200
x12689
1834B
Maximum Strength
greedy
,
math
1000
x14584
1834A
Unit Array
greedy
,
math
800
x21468
1833G
Ksyusha and Chinchilla
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1800
x4966
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x6764
1833E
Round Dance
dfs and similar
,
dsu
,
graphs
,
shortest paths
1600
x10420
1833D
Flipper
brute force
,
constructive algorithms
,
greedy
1400
x12751
1833C
Vlad Building Beautiful Array
greedy
,
math
800
x25572
1833B
Restore the Weather
greedy
,
sortings
900
x25490
1833A
Musical Puzzle
implementation
,
strings
800
x31676
1832F
Zombies
binary search
,
dp
3200
x253
1832E
Combinatorics Problem
brute force
,
combinatorics
,
dp
2200
x2063
1832D2
Red-Blue Operations (Hard Version)
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
2400
x1801
1832D1
Red-Blue Operations (Easy Version)
binary search
,
greedy
,
implementation
,
math
2100
x2805
1832C
Contrast Value
greedy
,
implementation
1200
x18419
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x19806
1832A
New Palindrome
strings
800
x24945
1831B
Array merging
constructive algorithms
,
greedy
1000
x18645
1831A
Twin Permutations
constructive algorithms
800
x24416
1830F
The Third Grace
data structures
,
dp
3200
x223
1830E
Bully Sort
data structures
,
math
3500
x231
1830D
Mex Tree
brute force
,
dp
,
trees
2800
x607
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
2400
x1536
1830B
The BOSS Can Count Pairs
brute force
,
math
2000
x4613
1830A
Copil Copac Draws Trees
dfs and similar
,
dp
,
graphs
,
trees
1400
x12532
1829H
Don't Blame Me
bitmasks
,
combinatorics
,
dp
,
math
1700
x7138
1829G
Hits Different
data structures
,
dp
,
implementation
,
math
1600
x9491
1829F
Forever Winter
dfs and similar
,
graphs
,
math
1300
x16283
1829E
The Lakes
dfs and similar
,
dsu
,
graphs
,
implementation
1100
x18357
1829D
Gold Rush
brute force
,
dfs and similar
,
dp
,
implementation
1000
x24389
1829C
Mr. Perfectly Fine
bitmasks
,
greedy
,
implementation
800
x27244
1829B
Blank Space
implementation
800
x41194
1829A
Love Story
implementation
,
strings
800
x46296
1828B
Permutation Swap
math
,
number theory
900
x20829
1828A
Divisible Array
constructive algorithms
,
math
800
x23061
1827F
Copium Permutation
constructive algorithms
,
data structures
,
greedy
3500
x108
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x363
1827D
Two Centroids
data structures
,
dfs and similar
,
greedy
,
trees
2800
x707
1827C
Palindrome Partition
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
strings
2600
x1150
1827B2
Range Sorting (Hard Version)
binary search
,
data structures
,
dp
,
greedy
2400
x1778
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x3673
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x17570
1826F
Fading into Fog
geometry
,
interactive
,
math
,
probabilities
2800
x339
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1510
1826D
Running Miles
brute force
,
dp
,
greedy
1700
x8664
1826C
Dreaming of Freedom
greedy
,
math
,
number theory
1300
x12864
1826B
Lunatic Never Content
math
,
number theory
1100
x15909
1826A
Trust Nobody
brute force
,
greedy
,
implementation
,
sortings
1200
x14560
1825B
LuoTianyi and the Table
greedy
,
math
1000
x14218
1825A
LuoTianyi and the Palindrome String
greedy
,
strings
800
x19312
1824E
LuoTianyi and Cartridge
data structures
,
trees
3500
x124
1824D
LuoTianyi and the Function
data structures
3000
x453
1824C
LuoTianyi and XOR-Tree
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2500
x1260
1824B2
LuoTianyi and the Floating Islands (Hard Version)
combinatorics
,
dfs and similar
,
math
,
probabilities
,
trees
2300
x2502
1824B1
LuoTianyi and the Floating Islands (Easy Version)
combinatorics
,
math
,
probabilities
,
trees
1800
x4352
1824A
LuoTianyi and the Show
greedy
,
implementation
1400
x10861
1823F
Random Walk
dp
,
graphs
,
math
,
probabilities
,
trees
2600
x793
1823E
Removing Graph
brute force
,
dp
,
games
,
graphs
,
math
2500
x1199
1823D
Unique Palindromes
constructive algorithms
,
math
,
strings
1900
x3667
1823C
Strongly Composite
greedy
,
math
,
number theory
1300
x11722
1823B
Sort with Step
brute force
,
math
,
sortings
900
x15373
1823A
A-characteristic
combinatorics
,
constructive algorithms
,
math
800
x15833
←
1
2
...
7
8
9
10
11
...
95
96
→
User lists
Name