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Codeforces Round 937 (Div. 4)
03:06:14
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Difficulty:
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dp
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
1552D
Array Differentiation
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
math
1800
x6634
148D
Bag of mice
dp
,
games
,
math
,
probabilities
1800
x6637
1479B1
Painting the Array I
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
1900
x6689
1353E
K-periodic Garland
brute force
,
dp
,
greedy
1900
x6731
1728D
Letter Picking
constructive algorithms
,
dp
,
games
,
two pointers
1800
x6739
1583C
Omkar and Determination
data structures
,
dp
1700
x6762
1491D
Zookeeper and The Infinite Zoo
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
1800
x6804
1829H
Don't Blame Me
bitmasks
,
combinatorics
,
dp
,
math
1700
x6834
915C
Permute Digits
dp
,
greedy
1700
x6844
1092F
Tree with Maximum Cost
dfs and similar
,
dp
,
trees
1900
x6905
1081C
Colorful Bricks
combinatorics
,
dp
,
math
1500
x6912
1692H
Gambling
data structures
,
dp
,
greedy
,
math
1700
x6926
817C
Really Big Numbers
binary search
,
brute force
,
dp
,
math
1600
x6935
682C
Alyona and the Tree
dfs and similar
,
dp
,
graphs
,
trees
1600
x6955
340D
Bubble Sort Graph
binary search
,
data structures
,
dp
1500
x6964
180C
Letter
dp
1400
x6971
991D
Bishwock
dp
,
greedy
1500
x6984
1296E1
String Coloring (easy version)
constructive algorithms
,
dp
,
graphs
,
greedy
,
sortings
1800
x6998
1040B
Shashlik Cooking
dp
,
greedy
,
math
1300
x7004
1594D
The Number of Imposters
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
graphs
1700
x7014
1051D
Bicolorings
bitmasks
,
dp
1700
x7019
1404B
Tree Tag
dfs and similar
,
dp
,
games
,
trees
1900
x7027
1239A
Ivan the Fool and the Probability Theory
combinatorics
,
dp
,
math
1700
x7061
1238C
Standard Free2play
dp
,
greedy
,
math
1600
x7071
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x7073
1845D
Rating System
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
two pointers
1800
x7136
1841C
Ranom Numbers
brute force
,
dp
,
greedy
,
math
,
strings
1800
x7139
1257D
Yet Another Monster Killing Problem
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
1700
x7158
1244D
Paint the Tree
brute force
,
constructive algorithms
,
dp
,
graphs
,
implementation
,
trees
1800
x7167
1875D
Jellyfish and Mex
dp
1600
x7179
1743D
Problem with Random Tests
brute force
,
dp
,
greedy
,
probabilities
1700
x7184
1132F
Clear the String
dp
2000
x7188
1285D
Dr. Evil Underscores
bitmasks
,
brute force
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
strings
,
trees
1900
x7224
1517D
Explorer Space
dp
,
graphs
,
shortest paths
1800
x7237
1187E
Tree Painting
dfs and similar
,
dp
,
trees
2100
x7257
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x7261
1637D
Yet Another Minimization Problem
dp
,
greedy
,
math
1800
x7264
873B
Balanced Substring
dp
,
implementation
1500
x7360
1779D
Boris and His Amazing Haircut
constructive algorithms
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1700
x7371
1084C
The Fair Nut and String
combinatorics
,
dp
,
implementation
1500
x7416
1535D
Playoff Tournament
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1800
x7430
1446B
Catching Cheaters
dp
,
strings
1800
x7461
1592C
Bakry and Partitioning
bitmasks
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x7475
1409E
Two Platforms
binary search
,
dp
,
sortings
,
two pointers
1800
x7491
888D
Almost Identity Permutations
combinatorics
,
dp
,
math
1600
x7492
1096D
Easy Problem
dp
1800
x7498
603A
Alternative Thinking
dp
,
greedy
,
math
1600
x7503
1278C
Berry Jam
data structures
,
dp
,
greedy
,
implementation
1700
x7526
1340B
Nastya and Scoreboard
bitmasks
,
dp
,
graphs
,
greedy
1700
x7551
416C
Booking System
binary search
,
dp
,
greedy
,
implementation
1600
x7571
835C
Star sky
dp
,
implementation
1600
x7591
543A
Writing Code
dp
1800
x7629
359B
Permutation
constructive algorithms
,
dp
,
math
1400
x7653
1472E
Correct Placement
binary search
,
data structures
,
dp
,
sortings
,
two pointers
1700
x7654
1491C
Pekora and Trampoline
brute force
,
data structures
,
dp
,
greedy
,
implementation
1700
x7672
729B
Spotlights
dp
,
implementation
1200
x7677
1512G
Short Task
brute force
,
dp
,
math
,
number theory
1700
x7695
913C
Party Lemonade
bitmasks
,
dp
,
greedy
1600
x7712
711C
Coloring Trees
dp
1700
x7712
448C
Painting Fence
divide and conquer
,
dp
,
greedy
1900
x7713
1452D
Radio Towers
combinatorics
,
dp
,
math
1600
x7719
1627D
Not Adding
brute force
,
dp
,
math
,
number theory
1900
x7732
332B
Maximum Absurdity
data structures
,
dp
,
implementation
1500
x7783
1335E2
Three Blocks Palindrome (hard version)
brute force
,
data structures
,
dp
,
two pointers
1800
x7896
1789C
Serval and Toxel's Arrays
combinatorics
,
dp
,
implementation
,
math
1500
x7927
1497E1
Square-Free Division (easy version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
1700
x7944
1693B
Fake Plastic Trees
dfs and similar
,
dp
,
greedy
,
trees
1700
x7970
279C
Ladder
dp
,
implementation
,
two pointers
1700
x7995
1677A
Tokitsukaze and Strange Inequality
brute force
,
data structures
,
dp
1600
x8029
1422C
Bargain
combinatorics
,
dp
,
math
1700
x8034
432D
Prefixes and Suffixes
dp
,
string suffix structures
,
strings
,
two pointers
2000
x8069
1038D
Slime
dp
,
greedy
,
implementation
1800
x8082
339C
Xenia and Weights
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1700
x8099
547B
Mike and Feet
binary search
,
data structures
,
dp
,
dsu
1900
x8101
1109A
Sasha and a Bit of Relax
dp
,
implementation
1600
x8209
1061C
Multiplicity
data structures
,
dp
,
implementation
,
math
,
number theory
1700
x8215
1369D
TediousLee
dp
,
graphs
,
greedy
,
math
,
trees
1900
x8216
1826D
Running Miles
brute force
,
dp
,
greedy
1700
x8225
548B
Mike and Fun
brute force
,
dp
,
greedy
,
implementation
1400
x8236
429B
Working out
dp
1600
x8236
798B
Mike and strings
brute force
,
dp
,
strings
1300
x8240
1557C
Moamen and XOR
bitmasks
,
combinatorics
,
dp
,
math
,
matrices
1700
x8246
1286A
Garland
dp
,
greedy
,
sortings
1800
x8283
855B
Marvolo Gaunt's Ring
brute force
,
data structures
,
dp
1500
x8294
611C
New Year and Domino
dp
,
implementation
1500
x8300
553A
Kyoya and Colored Balls
combinatorics
,
dp
,
math
1500
x8313
1476D
Journey
dfs and similar
,
dp
,
dsu
,
implementation
1700
x8345
1392D
Omkar and Bed Wars
dp
,
greedy
1700
x8367
1036C
Classy Numbers
combinatorics
,
dp
1900
x8395
416B
Art Union
brute force
,
dp
,
implementation
1300
x8395
1528B
Kavi on Pairing Duty
combinatorics
,
dp
,
math
1700
x8402
219D
Choosing Capital for Treeland
dfs and similar
,
dp
,
graphs
,
trees
1700
x8407
1381B
Unmerge
dp
1800
x8440
1714D
Color with Occurrences
brute force
,
data structures
,
dp
,
greedy
,
strings
1600
x8445
1572A
Book
binary search
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
1800
x8445
1327E
Count The Blocks
combinatorics
,
dp
,
math
1800
x8450
1442A
Extreme Subtraction
constructive algorithms
,
dp
,
greedy
1800
x8487
1221D
Make The Fence Great Again
dp
1800
x8535
1619E
MEX and Increments
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
sortings
1700
x8539
1408C
Discrete Acceleration
binary search
,
dp
,
implementation
,
math
,
two pointers
1500
x8577
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