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Before contest
Codeforces Round 941 (Div. 1)
06:47:06
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Before contest
Codeforces Round 941 (Div. 2)
06:47:06
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bitmasks
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
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shortest paths
sortings
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strings
ternary search
trees
two pointers
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Problems
#
Name
1731C
Even Subarrays
bitmasks
,
brute force
,
hashing
,
math
,
number theory
1700
x8895
1152B
Neko Performs Cat Furrier Transform
bitmasks
,
constructive algorithms
,
dfs and similar
,
math
1300
x8799
1202A
You Are Given Two Binary Strings...
bitmasks
,
greedy
1100
x8787
1658D1
388535 (Easy Version)
bitmasks
,
math
1600
x8741
1225C
p-binary
bitmasks
,
brute force
,
math
1600
x8640
1554C
Mikasa
binary search
,
bitmasks
,
greedy
,
implementation
1800
x8502
242E
XOR on Segment
bitmasks
,
data structures
2000
x8378
1557C
Moamen and XOR
bitmasks
,
combinatorics
,
dp
,
math
,
matrices
1700
x8311
1801A
The Very Beautiful Blanket
bitmasks
,
constructive algorithms
1600
x8085
1338B
Edge Weight Assignment
bitmasks
,
constructive algorithms
,
dfs and similar
,
greedy
,
math
,
trees
1800
x8042
1332D
Walk on Matrix
bitmasks
,
constructive algorithms
,
math
1700
x7807
913C
Party Lemonade
bitmasks
,
dp
,
greedy
1600
x7735
1778C
Flexible String
bitmasks
,
brute force
,
strings
1600
x7626
1592C
Bakry and Partitioning
bitmasks
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x7583
1340B
Nastya and Scoreboard
bitmasks
,
dp
,
graphs
,
greedy
1700
x7566
1543D1
RPD and Rap Sheet (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
1700
x7423
1285D
Dr. Evil Underscores
bitmasks
,
brute force
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
strings
,
trees
1900
x7325
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x7180
224B
Array
bitmasks
,
implementation
,
two pointers
1500
x7145
1051D
Bicolorings
bitmasks
,
dp
1700
x7113
1217C
The Number Of Good Substrings
binary search
,
bitmasks
,
brute force
1700
x7082
1829H
Don't Blame Me
bitmasks
,
combinatorics
,
dp
,
math
1700
x7006
1883E
Look Back
bitmasks
,
greedy
1700
x6975
1922E
Increasing Subsequences
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
math
1800
x6966
1466E
Apollo versus Pan
bitmasks
,
brute force
,
math
1800
x6934
1491D
Zookeeper and The Infinite Zoo
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
1800
x6872
1760G
SlavicG's Favorite Problem
bitmasks
,
dfs and similar
,
graphs
1700
x6851
1303D
Fill The Bag
bitmasks
,
greedy
1900
x6805
1552D
Array Differentiation
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
math
1800
x6675
1288D
Minimax Problem
binary search
,
bitmasks
,
dp
2000
x6662
570D
Tree Requests
binary search
,
bitmasks
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2200
x6623
888E
Maximum Subsequence
bitmasks
,
divide and conquer
,
meet-in-the-middle
1800
x6580
1879D
Sum of XOR Functions
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
1700
x6524
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x6464
1556D
Take a Guess
bitmasks
,
constructive algorithms
,
interactive
,
math
1800
x6460
1868B1
Candy Party (Easy Version)
bitmasks
,
constructive algorithms
,
graphs
,
greedy
,
implementation
,
math
1700
x6406
1329B
Dreamoon Likes Sequences
bitmasks
,
combinatorics
,
math
1700
x6350
1205B
Shortest Cycle
bitmasks
,
brute force
,
graphs
,
shortest paths
1900
x6282
1721D
Maximum AND
bitmasks
,
dfs and similar
,
divide and conquer
,
greedy
,
sortings
1800
x6276
677C
Vanya and Label
bitmasks
,
combinatorics
,
implementation
,
strings
1500
x6271
165E
Compatible Numbers
bitmasks
,
brute force
,
dfs and similar
,
dp
2200
x6165
1470B
Strange Definition
bitmasks
,
graphs
,
hashing
,
math
,
number theory
1900
x6139
1635D
Infinite Set
bitmasks
,
dp
,
math
,
matrices
,
number theory
,
strings
1800
x5988
1492D
Genius's Gambit
bitmasks
,
constructive algorithms
,
greedy
,
math
1900
x5921
1560F1
Nearest Beautiful Number (easy version)
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
1900
x5897
1792D
Fixed Prefix Permutations
binary search
,
bitmasks
,
data structures
,
hashing
,
math
,
sortings
1700
x5859
1720D1
Xor-Subsequence (easy version)
bitmasks
,
brute force
,
dp
,
strings
,
trees
,
two pointers
1800
x5710
1862F
Magic Will Save the World
binary search
,
bitmasks
,
brute force
,
dp
1800
x5619
1207E
XOR Guessing
bitmasks
,
interactive
,
math
1900
x5596
1732C1
Sheikh (Easy version)
binary search
,
bitmasks
,
greedy
,
two pointers
1800
x5552
1895D
XOR Construction
bitmasks
,
constructive algorithms
,
data structures
,
math
,
string suffix structures
,
trees
1900
x5531
1624G
MinOr Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x5515
1851F
Lisa and the Martians
bitmasks
,
greedy
,
math
,
strings
,
trees
1800
x5268
878A
Short Program
bitmasks
,
constructive algorithms
1600
x5262
1582F1
Korney Korneevich and XOR (easy version)
bitmasks
,
dp
,
greedy
1800
x5237
961C
Chessboard
bitmasks
,
brute force
,
implementation
1400
x5215
1543C
Need for Pink Slips
bitmasks
,
brute force
,
dfs and similar
,
implementation
,
math
,
probabilities
1900
x5179
510D
Fox And Jumping
bitmasks
,
brute force
,
dp
,
math
1900
x5168
620E
New Year Tree
bitmasks
,
data structures
,
trees
2100
x5165
1415D
XOR-gun
bitmasks
,
brute force
,
constructive algorithms
2000
x5159
27B
Tournament
bitmasks
,
brute force
,
dfs and similar
,
greedy
1300
x5133
895C
Square Subsets
bitmasks
,
combinatorics
,
dp
,
math
2000
x5105
812B
Sagheer, the Hausmeister
bitmasks
,
brute force
,
dp
1600
x5068
1903D1
Maximum And Queries (easy version)
binary search
,
bitmasks
,
brute force
,
greedy
1700
x5020
1882D
Tree XOR
bitmasks
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x4939
1391D
505
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
implementation
2000
x4921
1715D
2+ doors
2-sat
,
bitmasks
,
graphs
,
greedy
1900
x4904
1383B
GameGame
bitmasks
,
constructive algorithms
,
dp
,
games
,
greedy
,
math
1900
x4754
1780D
Bit Guessing Game
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1800
x4631
1006F
Xor-Paths
bitmasks
,
brute force
,
dp
,
meet-in-the-middle
2100
x4627
16E
Fish
bitmasks
,
dp
,
probabilities
1900
x4605
1174D
Ehab and the Expected XOR Problem
bitmasks
,
constructive algorithms
1900
x4592
868C
Qualification Rounds
bitmasks
,
brute force
,
constructive algorithms
,
dp
1500
x4520
453B
Little Pony and Harmony Chest
bitmasks
,
brute force
,
dp
2000
x4517
1747D
Yet Another Problem
binary search
,
bitmasks
,
constructive algorithms
,
data structures
1900
x4464
11D
A Simple Task
bitmasks
,
dp
,
graphs
2200
x4422
244B
Undoubtedly Lucky Numbers
bitmasks
,
brute force
,
dfs and similar
1600
x4364
1360H
Binary Median
binary search
,
bitmasks
,
brute force
,
constructive algorithms
2100
x4276
877E
Danil and a Part-time Job
bitmasks
,
data structures
,
trees
2000
x4232
1560F2
Nearest Beautiful Number (hard version)
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
2100
x4186
1451E1
Bitwise Queries (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2000
x4182
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x4162
1438D
Powerful Ksenia
bitmasks
,
constructive algorithms
,
math
2200
x4062
449D
Jzzhu and Numbers
bitmasks
,
combinatorics
,
dp
2400
x4059
1846G
Rudolf and CodeVid-23
bitmasks
,
dp
,
graphs
,
greedy
,
shortest paths
1900
x4026
1618F
Reverse
bitmasks
,
constructive algorithms
,
dfs and similar
,
implementation
,
math
,
strings
2000
x4016
1144E
Median String
bitmasks
,
math
,
number theory
,
strings
1900
x4005
401D
Roman and Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
number theory
2000
x3965
1322B
Present
binary search
,
bitmasks
,
constructive algorithms
,
data structures
,
math
,
sortings
2100
x3898
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x3896
888G
Xor-MST
bitmasks
,
constructive algorithms
,
data structures
2300
x3871
960C
Subsequence Counting
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1700
x3807
243A
The Brand New Function
bitmasks
1600
x3781
1600J
Robot Factory
bitmasks
,
dfs and similar
1400
x3770
1220D
Alex and Julian
bitmasks
,
math
,
number theory
1900
x3684
1665D
GCD Guess
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
games
,
interactive
,
math
,
number theory
2000
x3677
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3671
1900D
Small GCD
bitmasks
,
brute force
,
dp
,
math
,
number theory
2000
x3667
1680E
Moving Chips
bitmasks
,
dp
,
greedy
2000
x3623
114B
PFAST Inc.
bitmasks
,
brute force
,
graphs
1500
x3516
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