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Before contest
Codeforces Round 941 (Div. 1)
2 days
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Before contest
Codeforces Round 941 (Div. 2)
2 days
Register now »
*has extra registration
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constructive algorithms
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
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Custom test
Problems
#
Name
1758D
Range = √Sum
binary search
,
brute force
,
constructive algorithms
,
math
,
two pointers
1800
x6838
1728D
Letter Picking
constructive algorithms
,
dp
,
games
,
two pointers
1800
x6818
1552D
Array Differentiation
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
math
1800
x6673
1768D
Lucky Permutation
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1800
x6665
1556D
Take a Guess
bitmasks
,
constructive algorithms
,
interactive
,
math
1800
x6456
1648B
Integral Array
brute force
,
constructive algorithms
,
data structures
,
math
1800
x6168
482B
Interesting Array
constructive algorithms
,
data structures
,
trees
1800
x6147
1705D
Mark and Lightbulbs
combinatorics
,
constructive algorithms
,
greedy
,
math
,
sortings
1800
x6083
1187C
Vasya And Array
constructive algorithms
,
greedy
,
implementation
1800
x6062
1304D
Shortest and Longest LIS
constructive algorithms
,
graphs
,
greedy
,
two pointers
1800
x6061
1809D
Binary String Sorting
constructive algorithms
,
greedy
1800
x5858
1208C
Magic Grid
constructive algorithms
1800
x5769
1923D
Slimes
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x5768
1552C
Maximize the Intersections
combinatorics
,
constructive algorithms
,
geometry
,
greedy
,
sortings
1800
x5764
1534D
Lost Tree
constructive algorithms
,
interactive
,
trees
1800
x5751
1477A
Nezzar and Board
constructive algorithms
,
math
,
number theory
1800
x5654
600C
Make Palindrome
constructive algorithms
,
greedy
,
strings
1800
x5624
1630B
Range and Partition
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x5489
1691D
Max GEQ Sum
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
implementation
,
two pointers
1800
x5451
1713D
Tournament Countdown
constructive algorithms
,
greedy
,
interactive
,
number theory
,
probabilities
1800
x5425
1867D
Cyclic Operations
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
1800
x5295
1151C
Problem for Nazar
constructive algorithms
,
math
1800
x5246
1583D
Omkar and the Meaning of Life
constructive algorithms
,
greedy
,
interactive
1800
x5223
1290B
Irreducible Anagrams
binary search
,
constructive algorithms
,
data structures
,
strings
,
two pointers
1800
x4902
1833G
Ksyusha and Chinchilla
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1800
x4901
1780D
Bit Guessing Game
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1800
x4628
1617D1
Too Many Impostors (easy version)
constructive algorithms
,
implementation
,
interactive
1800
x4517
1016D
Vasya And The Matrix
constructive algorithms
,
flows
,
math
1800
x4421
1254B1
Send Boxes to Alice (Easy Version)
constructive algorithms
,
greedy
,
math
,
number theory
,
ternary search
,
two pointers
1800
x4404
1286B
Numbers on Tree
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x4379
894B
Ralph And His Magic Field
combinatorics
,
constructive algorithms
,
math
,
number theory
1800
x4369
623A
Graph and String
constructive algorithms
,
graphs
1800
x4355
1179B
Tolik and His Uncle
constructive algorithms
1800
x4293
1109B
Sasha and One More Name
constructive algorithms
,
hashing
,
strings
1800
x4251
1852B
Imbalanced Arrays
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
1800
x4121
1740E
Hanging Hearts
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
greedy
,
trees
1800
x4092
1508B
Almost Sorted
binary search
,
combinatorics
,
constructive algorithms
,
implementation
1800
x3823
551B
ZgukistringZ
brute force
,
constructive algorithms
,
implementation
,
strings
1800
x3759
1904D2
Set To Max (Hard Version)
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
sortings
1800
x3744
989C
A Mist of Florescence
constructive algorithms
,
graphs
1800
x3652
1082D
Maximum Diameter Graph
constructive algorithms
,
graphs
,
implementation
1800
x3544
1196E
Connected Component on a Chessboard
constructive algorithms
,
implementation
1800
x3500
827B
High Load
constructive algorithms
,
greedy
,
implementation
,
trees
1800
x3435
733C
Epidemic in Monstropolis
constructive algorithms
,
dp
,
greedy
,
two pointers
1800
x3294
663A
Rebus
constructive algorithms
,
expression parsing
,
greedy
,
math
1800
x3242
665D
Simple Subset
constructive algorithms
,
greedy
,
number theory
1800
x3194
1666C
Connect the Points
brute force
,
constructive algorithms
,
geometry
1800
x3074
301A
Yaroslav and Sequence
constructive algorithms
1800
x3038
873D
Merge Sort
constructive algorithms
,
divide and conquer
1800
x2993
1846F
Rudolph and Mimic
constructive algorithms
,
implementation
,
interactive
1800
x2856
1267L
Lexicography
constructive algorithms
,
strings
1800
x2846
641C
Little Artem and Dance
brute force
,
constructive algorithms
,
implementation
1800
x2839
610C
Harmony Analysis
constructive algorithms
1800
x2782
899D
Shovel Sale
constructive algorithms
,
math
1800
x2677
1250B
The Feast and the Bus
brute force
,
constructive algorithms
,
greedy
,
math
1800
x2558
1725H
Hot Black Hot White
constructive algorithms
,
math
1800
x2493
538D
Weird Chess
brute force
,
constructive algorithms
,
implementation
1800
x2406
730B
Minimum and Maximum
constructive algorithms
,
interactive
1800
x2375
141C
Queue
constructive algorithms
,
greedy
,
sortings
1800
x2364
847C
Sum of Nestings
constructive algorithms
1800
x2326
533E
Correcting Mistakes
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x2169
145B
Lucky Number 2
constructive algorithms
1800
x2147
142B
Help General
constructive algorithms
,
greedy
,
implementation
1800
x2129
1090D
Similar Arrays
constructive algorithms
1800
x1980
452B
4-point polyline
brute force
,
constructive algorithms
,
geometry
,
trees
1800
x1975
727D
T-shirts Distribution
constructive algorithms
,
flows
,
greedy
1800
x1796
370C
Mittens
constructive algorithms
,
greedy
,
sortings
1800
x1499
238B
Boring Partition
constructive algorithms
1800
x1263
883K
Road Widening
constructive algorithms
,
greedy
,
implementation
1800
x1070
45J
Planting Trees
constructive algorithms
1800
x884
1571D
Sweepstake
*special problem
,
brute force
,
constructive algorithms
,
implementation
,
math
1800
x317
5C
Longest Regular Bracket Sequence
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
,
strings
1900
x12622
1375D
Replace by MEX
brute force
,
constructive algorithms
,
sortings
1900
x8703
1348D
Phoenix and Science
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
1900
x8472
1620E
Replace the Numbers
constructive algorithms
,
data structures
,
dsu
,
implementation
1900
x7725
1527B2
Palindrome Game (hard version)
constructive algorithms
,
games
1900
x7517
1365E
Maximum Subsequence Value
brute force
,
constructive algorithms
1900
x7484
1360G
A/B Matrix
constructive algorithms
,
greedy
,
math
1900
x7371
1479B1
Painting the Array I
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
1900
x6726
1854A2
Dual (Hard Version)
constructive algorithms
,
math
1900
x6644
1656D
K-good
constructive algorithms
,
math
,
number theory
1900
x6574
1467C
Three Bags
constructive algorithms
,
greedy
1900
x6198
459C
Pashmak and Buses
combinatorics
,
constructive algorithms
,
math
1900
x6062
1508A
Binary Literature
constructive algorithms
,
greedy
,
implementation
,
strings
,
two pointers
1900
x5981
1492D
Genius's Gambit
bitmasks
,
constructive algorithms
,
greedy
,
math
1900
x5919
1560F1
Nearest Beautiful Number (easy version)
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
1900
x5897
1342D
Multiple Testcases
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
1900
x5828
1264B
Beautiful Sequence
brute force
,
constructive algorithms
,
greedy
1900
x5576
1895D
XOR Construction
bitmasks
,
constructive algorithms
,
data structures
,
math
,
string suffix structures
,
trees
1900
x5526
1696D
Permutation Graph
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
shortest paths
1900
x5156
1647D
Madoka and the Best School in Russia
constructive algorithms
,
dp
,
math
,
number theory
1900
x5094
1475F
Unusual Matrix
2-sat
,
brute force
,
constructive algorithms
1900
x5059
1228D
Complete Tripartite
brute force
,
constructive algorithms
,
graphs
,
hashing
,
implementation
1900
x4963
1439A2
Binary Table (Hard Version)
constructive algorithms
,
graphs
,
greedy
,
implementation
1900
x4942
1213E
Two Small Strings
brute force
,
constructive algorithms
1900
x4905
803C
Maximal GCD
constructive algorithms
,
greedy
,
math
1900
x4903
1202D
Print a 1337-string...
combinatorics
,
constructive algorithms
,
math
,
strings
1900
x4862
1704D
Magical Array
constructive algorithms
,
hashing
,
implementation
,
math
1900
x4832
1383B
GameGame
bitmasks
,
constructive algorithms
,
dp
,
games
,
greedy
,
math
1900
x4751
1305D
Kuroni and the Celebration
constructive algorithms
,
dfs and similar
,
interactive
,
trees
1900
x4731
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