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Before contest
Codeforces Round 937 (Div. 4)
03:50:46
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Difficulty:
—
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
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Problems
#
Name
1202A
You Are Given Two Binary Strings...
bitmasks
,
greedy
1100
x8710
1658D1
388535 (Easy Version)
bitmasks
,
math
1600
x8675
1152B
Neko Performs Cat Furrier Transform
bitmasks
,
constructive algorithms
,
dfs and similar
,
math
1300
x8650
1225C
p-binary
bitmasks
,
brute force
,
math
1600
x8592
1554C
Mikasa
binary search
,
bitmasks
,
greedy
,
implementation
1800
x8433
242E
XOR on Segment
bitmasks
,
data structures
2000
x8259
1557C
Moamen and XOR
bitmasks
,
combinatorics
,
dp
,
math
,
matrices
1700
x8245
1338B
Edge Weight Assignment
bitmasks
,
constructive algorithms
,
dfs and similar
,
greedy
,
math
,
trees
1800
x7987
1801A
The Very Beautiful Blanket
bitmasks
,
constructive algorithms
1600
x7966
1332D
Walk on Matrix
bitmasks
,
constructive algorithms
,
math
1700
x7790
913C
Party Lemonade
bitmasks
,
dp
,
greedy
1600
x7712
1340B
Nastya and Scoreboard
bitmasks
,
dp
,
graphs
,
greedy
1700
x7551
1778C
Flexible String
bitmasks
,
brute force
,
strings
1600
x7518
1592C
Bakry and Partitioning
bitmasks
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x7475
1543D1
RPD and Rap Sheet (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
1700
x7401
1285D
Dr. Evil Underscores
bitmasks
,
brute force
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
strings
,
trees
1900
x7224
224B
Array
bitmasks
,
implementation
,
two pointers
1500
x7104
1217C
The Number Of Good Substrings
binary search
,
bitmasks
,
brute force
1700
x7045
1051D
Bicolorings
bitmasks
,
dp
1700
x7019
1466E
Apollo versus Pan
bitmasks
,
brute force
,
math
1800
x6882
1829H
Don't Blame Me
bitmasks
,
combinatorics
,
dp
,
math
1700
x6834
1491D
Zookeeper and The Infinite Zoo
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
1800
x6802
1922E
Increasing Subsequences
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
math
1800
x6794
1760G
SlavicG's Favorite Problem
bitmasks
,
dfs and similar
,
graphs
1700
x6718
1303D
Fill The Bag
bitmasks
,
greedy
1900
x6712
1883E
Look Back
bitmasks
,
greedy
1700
x6675
1552D
Array Differentiation
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
math
1800
x6633
1288D
Minimax Problem
binary search
,
bitmasks
,
dp
2000
x6550
570D
Tree Requests
binary search
,
bitmasks
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2200
x6521
888E
Maximum Subsequence
bitmasks
,
divide and conquer
,
meet-in-the-middle
1800
x6474
1556D
Take a Guess
bitmasks
,
constructive algorithms
,
interactive
,
math
1800
x6384
1879D
Sum of XOR Functions
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
1700
x6353
1329B
Dreamoon Likes Sequences
bitmasks
,
combinatorics
,
math
1700
x6340
1868B1
Candy Party (Easy Version)
bitmasks
,
constructive algorithms
,
graphs
,
greedy
,
implementation
,
math
1700
x6289
1205B
Shortest Cycle
bitmasks
,
brute force
,
graphs
,
shortest paths
1900
x6258
677C
Vanya and Label
bitmasks
,
combinatorics
,
implementation
,
strings
1500
x6248
1721D
Maximum AND
bitmasks
,
dfs and similar
,
divide and conquer
,
greedy
,
sortings
1800
x6184
1470B
Strange Definition
bitmasks
,
graphs
,
hashing
,
math
,
number theory
1900
x6113
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x6104
165E
Compatible Numbers
bitmasks
,
brute force
,
dfs and similar
,
dp
2200
x6083
1635D
Infinite Set
bitmasks
,
dp
,
math
,
matrices
,
number theory
,
strings
1800
x5936
1492D
Genius's Gambit
bitmasks
,
constructive algorithms
,
greedy
,
math
1900
x5904
1560F1
Nearest Beautiful Number (easy version)
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
1900
x5856
1792D
Fixed Prefix Permutations
binary search
,
bitmasks
,
data structures
,
hashing
,
math
,
sortings
1700
x5778
1720D1
Xor-Subsequence (easy version)
bitmasks
,
brute force
,
dp
,
strings
,
trees
,
two pointers
1800
x5654
1207E
XOR Guessing
bitmasks
,
interactive
,
math
1900
x5561
1862F
Magic Will Save the World
binary search
,
bitmasks
,
brute force
,
dp
1800
x5489
1732C1
Sheikh (Easy version)
binary search
,
bitmasks
,
greedy
,
two pointers
1800
x5469
1624G
MinOr Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x5442
1895D
XOR Construction
bitmasks
,
constructive algorithms
,
data structures
,
math
,
string suffix structures
,
trees
1900
x5388
878A
Short Program
bitmasks
,
constructive algorithms
1600
x5232
961C
Chessboard
bitmasks
,
brute force
,
implementation
1400
x5200
1543C
Need for Pink Slips
bitmasks
,
brute force
,
dfs and similar
,
implementation
,
math
,
probabilities
1900
x5160
1582F1
Korney Korneevich and XOR (easy version)
bitmasks
,
dp
,
greedy
1800
x5155
1851F
Lisa and the Martians
bitmasks
,
greedy
,
math
,
strings
,
trees
1800
x5140
510D
Fox And Jumping
bitmasks
,
brute force
,
dp
,
math
1900
x5124
1415D
XOR-gun
bitmasks
,
brute force
,
constructive algorithms
2000
x5116
27B
Tournament
bitmasks
,
brute force
,
dfs and similar
,
greedy
1300
x5093
620E
New Year Tree
bitmasks
,
data structures
,
trees
2100
x5057
812B
Sagheer, the Hausmeister
bitmasks
,
brute force
,
dp
1600
x5054
895C
Square Subsets
bitmasks
,
combinatorics
,
dp
,
math
2000
x5015
1391D
505
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
implementation
2000
x4892
1903D1
Maximum And Queries (easy version)
binary search
,
bitmasks
,
brute force
,
greedy
1700
x4869
1715D
2+ doors
2-sat
,
bitmasks
,
graphs
,
greedy
1900
x4851
1882D
Tree XOR
bitmasks
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x4751
1383B
GameGame
bitmasks
,
constructive algorithms
,
dp
,
games
,
greedy
,
math
1900
x4723
1780D
Bit Guessing Game
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1800
x4581
1174D
Ehab and the Expected XOR Problem
bitmasks
,
constructive algorithms
1900
x4574
1006F
Xor-Paths
bitmasks
,
brute force
,
dp
,
meet-in-the-middle
2100
x4554
16E
Fish
bitmasks
,
dp
,
probabilities
1900
x4524
868C
Qualification Rounds
bitmasks
,
brute force
,
constructive algorithms
,
dp
1500
x4502
453B
Little Pony and Harmony Chest
bitmasks
,
brute force
,
dp
2000
x4490
1747D
Yet Another Problem
binary search
,
bitmasks
,
constructive algorithms
,
data structures
1900
x4414
11D
A Simple Task
bitmasks
,
dp
,
graphs
2200
x4361
244B
Undoubtedly Lucky Numbers
bitmasks
,
brute force
,
dfs and similar
1600
x4330
1360H
Binary Median
binary search
,
bitmasks
,
brute force
,
constructive algorithms
2100
x4267
877E
Danil and a Part-time Job
bitmasks
,
data structures
,
trees
2000
x4185
1560F2
Nearest Beautiful Number (hard version)
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
2100
x4163
1451E1
Bitwise Queries (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2000
x4155
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x4131
1438D
Powerful Ksenia
bitmasks
,
constructive algorithms
,
math
2200
x4030
449D
Jzzhu and Numbers
bitmasks
,
combinatorics
,
dp
2400
x3990
1618F
Reverse
bitmasks
,
constructive algorithms
,
dfs and similar
,
implementation
,
math
,
strings
2000
x3970
1846G
Rudolf and CodeVid-23
bitmasks
,
dp
,
graphs
,
greedy
,
shortest paths
1900
x3933
401D
Roman and Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
number theory
2000
x3930
1144E
Median String
bitmasks
,
math
,
number theory
,
strings
1900
x3882
1322B
Present
binary search
,
bitmasks
,
constructive algorithms
,
data structures
,
math
,
sortings
2100
x3867
888G
Xor-MST
bitmasks
,
constructive algorithms
,
data structures
2300
x3811
960C
Subsequence Counting
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1700
x3801
243A
The Brand New Function
bitmasks
1600
x3760
1600J
Robot Factory
bitmasks
,
dfs and similar
1400
x3732
1665D
GCD Guess
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
games
,
interactive
,
math
,
number theory
2000
x3648
1220D
Alex and Julian
bitmasks
,
math
,
number theory
1900
x3634
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3613
1680E
Moving Chips
bitmasks
,
dp
,
greedy
2000
x3585
1900D
Small GCD
bitmasks
,
brute force
,
dp
,
math
,
number theory
2000
x3523
114B
PFAST Inc.
bitmasks
,
brute force
,
graphs
1500
x3476
581D
Three Logos
bitmasks
,
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3388
1146C
Tree Diameter
bitmasks
,
graphs
,
interactive
1700
x3364
1446C
Xor Tree
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
dp
,
trees
2100
x3362
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