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Codeforces Round 973 (Div. 2)
10:35:59
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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
1932G
Moving Platforms
graphs
,
math
,
number theory
,
shortest paths
2300
x1045
1932F
Feed Cats
data structures
,
dp
,
sortings
1900
x4009
1932E
Final Countdown
implementation
,
math
,
number theory
1600
x7968
1932D
Card Game
greedy
,
implementation
1400
x11244
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x15435
1932B
Chaya Calendar
number theory
1100
x20442
1932A
Thorns and Coins
dp
,
greedy
,
implementation
800
x29132
1931G
One-Dimensional Puzzle
combinatorics
,
math
,
number theory
2000
x2755
1931F
Chat Screenshots
combinatorics
,
dfs and similar
,
graphs
1700
x7878
1931E
Anna and the Valentine's Day Gift
games
,
greedy
,
math
,
sortings
1400
x15473
1931D
Divisible Pairs
combinatorics
,
math
,
number theory
1300
x18397
1931C
Make Equal Again
brute force
,
greedy
,
math
1000
x28652
1931B
Make Equal
greedy
800
x31857
1931A
Recovering a Small String
brute force
,
strings
800
x35810
1930I
Counting Is Fun
combinatorics
3500
x69
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x152
1930G
Prefix Max Set Counting
data structures
,
dp
,
trees
3100
x333
1930F
Maximize the Difference
bitmasks
,
brute force
,
dfs and similar
2700
x700
1930E
2..3...4.... Wonderful! Wonderful!
combinatorics
,
dp
,
math
2400
x1109
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2581
1930D1
Sum over all Substrings (Easy Version)
brute force
,
dp
,
greedy
,
strings
1800
x4044
1930C
Lexicographically Largest
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
1700
x6934
1930B
Permutation Printing
brute force
,
constructive algorithms
,
math
1000
x15005
1930A
Maximise The Score
greedy
,
sortings
800
x18340
1929F
Sasha and the Wedding Binary Search Tree
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
math
,
trees
2300
x1762
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1655
1929D
Sasha and a Walk in the City
combinatorics
,
dp
,
math
,
trees
1900
x4671
1929C
Sasha and the Casino
binary search
,
brute force
,
constructive algorithms
,
games
,
greedy
,
math
1400
x14576
1929B
Sasha and the Drawing
constructive algorithms
,
greedy
,
math
800
x24991
1929A
Sasha and the Beautiful Array
constructive algorithms
,
greedy
,
math
,
sortings
800
x31085
1928F
Digital Patterns
combinatorics
,
data structures
,
implementation
,
math
2900
x237
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1680
1928D
Lonely Mountain Dungeons
brute force
,
data structures
,
greedy
,
math
,
ternary search
1900
x4180
1928C
Physical Education Lesson
brute force
,
math
,
number theory
1600
x8372
1928B
Equalize
binary search
,
greedy
,
sortings
,
two pointers
1200
x17063
1928A
Rectangle Cutting
geometry
,
math
800
x22349
1927G
Paint Charges
data structures
,
dp
,
greedy
,
math
2300
x1637
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x4271
1927E
Klever Permutation
constructive algorithms
,
math
,
two pointers
1400
x13774
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x20994
1927C
Choose the Different Ones!
brute force
,
greedy
,
math
1000
x27594
1927B
Following the String
constructive algorithms
,
greedy
,
strings
900
x32702
1927A
Make it White
greedy
,
strings
800
x42495
1926G
Vlad and Trouble at MIT
dfs and similar
,
dp
,
flows
,
graphs
,
greedy
,
implementation
,
trees
1900
x3463
1926F
Vlad and Avoiding X
bitmasks
,
brute force
,
dfs and similar
,
dp
,
implementation
2200
x1665
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x11651
1926D
Vlad and Division
bitmasks
,
greedy
1300
x15258
1926C
Vlad and a Sum of Sum of Digits
dp
,
implementation
1200
x26100
1926B
Vlad and Shapes
geometry
,
implementation
800
x32074
1926A
Vlad and the Best of Five
implementation
800
x47056
1925D
Good Trip
combinatorics
,
dp
,
math
,
probabilities
1900
x3565
1925B
A Balanced Problemset?
brute force
,
greedy
,
math
,
number theory
1200
x19744
1925A
We Got Everything Covered!
constructive algorithms
,
greedy
,
strings
800
x28471
1924F
Anti-Proxy Attendance
constructive algorithms
,
dp
,
interactive
,
ternary search
3500
x150
1924E
Paper Cutting Again
combinatorics
,
probabilities
3100
x425
1924D
Balanced Subsequences
combinatorics
,
dp
,
math
2700
x966
1924C
Fractal Origami
geometry
,
math
,
matrices
2400
x1133
1924B
Space Harbour
data structures
,
implementation
,
math
,
sortings
2100
x2496
1924A
Did We Get Everything Covered?
constructive algorithms
,
dp
,
greedy
,
shortest paths
,
strings
1500
x13711
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x371
1923E
Count Paths
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
2000
x3720
1923D
Slimes
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x6627
1923C
Find B
constructive algorithms
,
greedy
1400
x14802
1923B
Monsters Attack!
dp
,
greedy
,
implementation
1100
x17485
1923A
Moving Chips
greedy
,
implementation
800
x24412
1922F
Replace on Segment
dp
,
graph matchings
2500
x1365
1922E
Increasing Subsequences
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
math
1800
x7585
1922D
Berserk Monsters
brute force
,
data structures
,
dsu
,
implementation
,
math
1900
x5604
1922C
Closest Cities
greedy
,
implementation
,
math
1300
x18232
1922B
Forming Triangles
combinatorics
,
constructive algorithms
,
math
,
sortings
1200
x20364
1922A
Tricky Template
constructive algorithms
,
implementation
,
strings
800
x26803
1921G
Mischievous Shooter
brute force
,
data structures
,
divide and conquer
,
dp
,
implementation
2200
x1224
1921F
Sum of Progression
brute force
,
data structures
,
dp
,
implementation
,
math
1900
x3790
1921E
Eat the Chip
brute force
,
games
,
greedy
,
math
1600
x9664
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x21378
1921C
Sending Messages
greedy
,
math
900
x29024
1921B
Arranging Cats
greedy
,
implementation
800
x33457
1921A
Square
greedy
,
math
800
x42503
1920F2
Smooth Sailing (Hard Version)
binary search
,
data structures
,
dsu
,
geometry
,
graphs
,
trees
3000
x446
1920F1
Smooth Sailing (Easy Version)
binary search
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
shortest paths
2500
x939
1920E
Counting Binary Strings
combinatorics
,
dp
,
math
2100
x2652
1920D
Array Repetition
binary search
,
brute force
,
dsu
,
implementation
,
math
1900
x5501
1920C
Partitioning the Array
brute force
,
math
,
number theory
1600
x13285
1920B
Summation Game
games
,
greedy
,
math
,
sortings
1100
x20566
1920A
Satisfying Constraints
brute force
,
greedy
,
math
800
x27519
1919H
Tree Diameter
interactive
,
trees
2000
x142
1919G
Tree LGM
constructive algorithms
,
divide and conquer
,
games
,
trees
3500
x179
1919F2
Wine Factory (Hard Version)
data structures
,
dp
,
flows
,
greedy
,
matrices
2800
x820
1919F1
Wine Factory (Easy Version)
data structures
,
greedy
2300
x2158
1919E
Counting Prefixes
combinatorics
,
constructive algorithms
,
dp
,
implementation
,
math
2600
x840
1919D
01 Tree
constructive algorithms
,
data structures
,
dsu
,
greedy
,
sortings
,
trees
2100
x3819
1919C
Grouping Increases
data structures
,
dp
,
greedy
1400
x18688
1919B
Plus-Minus Split
greedy
800
x29594
1919A
Wallet Exchange
games
,
math
800
x33111
1918G
Permutation of Given
constructive algorithms
,
math
2700
x458
1918F
Caterpillar on a Tree
dfs and similar
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
2500
x855
1918E
ace5 and Task Order
constructive algorithms
,
divide and conquer
,
implementation
,
interactive
,
probabilities
,
sortings
2200
x1698
1918D
Blocking Elements
binary search
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4697
1918C
XOR-distance
bitmasks
,
greedy
,
implementation
,
math
1400
x13756
1918B
Minimize Inversions
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
900
x23491
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