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Before contest
Codeforces Round 940 (Div. 2) and CodeCraft-23
35:18:12
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Difficulty:
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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
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Problems
#
Name
1835F
Good Graph
bitmasks
,
dfs and similar
,
graph matchings
,
graphs
,
implementation
3500
x134
1707F
Bugaboo
bitmasks
,
constructive algorithms
,
dp
,
number theory
3500
x138
1515H
Phoenix and Bits
bitmasks
,
brute force
,
data structures
,
sortings
3500
x204
1439E
Cheat and Win
bitmasks
,
data structures
,
games
,
trees
3500
x213
1450G
Communism
bitmasks
,
dp
,
trees
3500
x226
1336E2
Chiori and Doll Picking (hard version)
bitmasks
,
brute force
,
combinatorics
,
math
3500
x280
1292F
Nora's Toy Boxes
bitmasks
,
combinatorics
,
dp
3500
x296
1305G
Kuroni and Antihype
bitmasks
,
brute force
,
dp
,
dsu
,
graphs
3500
x935
1097H
Mateusz and an Infinite Sequence
bitmasks
,
brute force
,
dp
,
strings
3400
x91
865F
Egg Roulette
bitmasks
,
brute force
,
divide and conquer
,
math
,
meet-in-the-middle
3300
x66
865E
Hex Dyslexia
bitmasks
,
brute force
,
dp
,
graphs
3300
x117
1804H
Code Lock
bitmasks
,
dp
3300
x168
1556G
Gates to Another World
bitmasks
,
data structures
,
dsu
,
two pointers
3300
x301
718E
Matvey's Birthday
bitmasks
,
graphs
3300
x331
1523F
Favorite Game
bitmasks
,
dp
3300
x393
1861F
Four Suits
binary search
,
bitmasks
,
flows
,
greedy
3200
x144
1799H
Tree Cutting
bitmasks
,
dfs and similar
,
dp
3200
x269
1214G
Feeling Good
bitmasks
,
data structures
3200
x277
1519F
Chests and Keys
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
3200
x380
750G
New Year and Binary Tree Paths
bitmasks
,
brute force
,
combinatorics
,
dp
3200
x438
1326F2
Wise Men (Hard Version)
bitmasks
,
dp
,
math
3200
x455
1034E
Little C Loves 3 III
bitmasks
,
dp
,
math
3200
x583
566E
Restoring Map
bitmasks
,
constructive algorithms
,
trees
3200
x599
1261F
Xor-Set
bitmasks
,
divide and conquer
,
math
3100
x369
1103D
Professional layer
bitmasks
,
dp
3100
x393
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x395
1225G
To Make 1
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
number theory
3100
x521
1463F
Max Correct Set
bitmasks
,
dp
,
math
3100
x548
1383C
String Transformation 2
bitmasks
,
dp
,
graphs
,
trees
3100
x555
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x558
1770F
Koxia and Sequence
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
3100
x594
1423I
Lookup Tables
bitmasks
3000
x100
1743G
Antifibonacci Cut
bitmasks
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
hashing
,
math
3000
x241
1748F
Circular Xor Reversal
bitmasks
,
constructive algorithms
3000
x321
1299D
Around the World
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
graphs
,
graphs
,
math
,
trees
3000
x409
1552G
A Serious Referee
bitmasks
,
brute force
,
dfs and similar
,
sortings
3000
x445
582E
Boolean Function
bitmasks
,
dp
,
expression parsing
3000
x474
1842H
Tenzing and Random Real Numbers
bitmasks
,
dp
,
graphs
,
math
,
probabilities
3000
x554
1152F2
Neko Rules the Catniverse (Large Version)
bitmasks
,
dp
,
matrices
3000
x586
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x632
1342F
Make It Ascending
bitmasks
,
brute force
,
dp
3000
x663
232E
Quick Tortoise
bitmasks
,
divide and conquer
,
dp
3000
x671
1616H
Keep XOR Low
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
,
dp
,
math
3000
x771
914F
Substrings in a String
bitmasks
,
brute force
,
data structures
,
string suffix structures
,
strings
3000
x1413
1725D
Deducing Sortability
binary search
,
bitmasks
,
math
2900
x116
217D
Bitonix' Patrol
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
math
2900
x241
1698G
Long Binary String
bitmasks
,
math
,
matrices
,
meet-in-the-middle
,
number theory
2900
x299
776G
Sherlock and the Encrypted Data
bitmasks
,
combinatorics
,
dp
2900
x326
1334G
Substring Search
bitmasks
,
brute force
,
fft
2900
x352
1392G
Omkar and Pies
bitmasks
,
dfs and similar
,
dp
,
math
,
shortest paths
2900
x439
1713F
Lost Array
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
2900
x504
1221G
Graph And Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
meet-in-the-middle
2900
x517
1705F
Mark and the Online Exam
bitmasks
,
constructive algorithms
,
interactive
,
probabilities
2900
x569
878D
Magic Breeding
bitmasks
2900
x638
1553H
XOR and Distance
bitmasks
,
divide and conquer
,
trees
2900
x667
938G
Shortest Path Queries
bitmasks
,
data structures
,
dsu
,
graphs
2900
x852
1479D
Odd Mineral Resource
binary search
,
bitmasks
,
brute force
,
data structures
,
probabilities
,
trees
2900
x943
796F
Sequence Recovery
bitmasks
,
data structures
,
greedy
2800
x168
1773G
Game of Questions
bitmasks
,
combinatorics
,
dp
,
fft
,
math
,
probabilities
2800
x318
1033F
Boolean Computer
bitmasks
,
brute force
,
fft
,
math
2800
x363
850E
Random Elections
bitmasks
,
brute force
,
divide and conquer
,
fft
,
math
2800
x377
472G
Design Tutorial: Increase the Constraints
bitmasks
,
data structures
,
fft
2800
x388
1327G
Letters and Question Marks
bitmasks
,
dp
,
string suffix structures
2800
x400
1386C
Joker
*special problem
,
bitmasks
,
data structures
,
divide and conquer
,
dsu
2800
x426
83E
Two Subsequences
bitmasks
,
dp
2800
x449
685E
Travelling Through the Snow Queen's Kingdom
bitmasks
,
brute force
,
divide and conquer
,
graphs
2800
x501
1152F1
Neko Rules the Catniverse (Small Version)
bitmasks
,
dp
,
matrices
2800
x507
1322D
Reality Show
bitmasks
,
dp
2800
x690
633G
Yash And Trees
bitmasks
,
data structures
,
dfs and similar
,
math
,
number theory
2800
x709
1365G
Secure Password
bitmasks
,
combinatorics
,
constructive algorithms
,
interactive
,
math
2800
x911
79D
Password
bitmasks
,
dp
,
shortest paths
2800
x934
1654F
Minimal String Xoration
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
hashing
,
sortings
,
strings
2800
x1045
336E
Vasily the Bear and Painting Square
bitmasks
,
combinatorics
,
dp
,
implementation
2700
x108
575C
Party
bitmasks
,
brute force
,
graph matchings
2700
x210
97D
Robot in Basement
bitmasks
,
brute force
,
implementation
2700
x228
1016G
Appropriate Team
bitmasks
,
math
,
number theory
2700
x252
76C
Mutation
bitmasks
,
dp
,
math
2700
x265
504D
Misha and XOR
bitmasks
2700
x296
1036G
Sources and Sinks
bitmasks
,
brute force
,
dfs and similar
2700
x359
1543E
The Final Pursuit
bitmasks
,
constructive algorithms
,
divide and conquer
,
graphs
,
greedy
,
math
2700
x392
1728G
Illumination
binary search
,
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
two pointers
2700
x402
1730F
Almost Sorted
bitmasks
,
data structures
,
dp
2700
x408
251D
Two Sets
bitmasks
,
math
2700
x440
938F
Erasing Substrings
bitmasks
,
dp
,
greedy
2700
x465
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x509
772D
Varying Kibibits
bitmasks
,
dp
2700
x565
1411G
No Game No Life
bitmasks
,
games
,
math
,
matrices
2700
x574
1930F
Maximize the Difference
bitmasks
,
brute force
,
dfs and similar
2700
x589
1849F
XOR Partition
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
trees
2700
x620
1795G
Removal Sequences
bitmasks
,
dfs and similar
,
graphs
2700
x641
1336E1
Chiori and Doll Picking (easy version)
bitmasks
,
brute force
,
combinatorics
,
math
2700
x645
1511G
Chips on a Board
bitmasks
,
brute force
,
data structures
,
dp
,
games
,
two pointers
2700
x695
241B
Friends
binary search
,
bitmasks
,
data structures
,
math
2700
x746
356D
Bags and Coins
bitmasks
,
constructive algorithms
,
dp
,
greedy
2700
x936
1148F
Foo Fighters
bitmasks
,
constructive algorithms
2700
x965
1641D
Two Arrays
bitmasks
,
brute force
,
combinatorics
,
greedy
,
hashing
,
math
,
two pointers
2700
x1035
1364E
X-OR
bitmasks
,
constructive algorithms
,
divide and conquer
,
interactive
,
probabilities
2700
x1107
1856E2
PermuTree (hard version)
bitmasks
,
dfs and similar
,
dp
,
fft
,
greedy
,
implementation
,
math
,
trees
2700
x1298
1599J
Bob's Beautiful Array
bitmasks
,
brute force
,
greedy
2600
x282
1027G
X-mouse in the Campus
bitmasks
,
math
,
number theory
2600
x292
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