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Codeforces Round 950 (Div. 3)
23:26:32
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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
1929A
Sasha and the Beautiful Array
constructive algorithms
,
greedy
,
math
,
sortings
800
x29371
1928F
Digital Patterns
combinatorics
,
data structures
,
implementation
,
math
2900
x215
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1579
1928D
Lonely Mountain Dungeons
brute force
,
data structures
,
greedy
,
math
,
ternary search
1900
x3828
1928C
Physical Education Lesson
brute force
,
math
,
number theory
1600
x7681
1928B
Equalize
binary search
,
greedy
,
sortings
,
two pointers
1200
x15626
1928A
Rectangle Cutting
geometry
,
math
800
x21436
1927G
Paint Charges
data structures
,
dp
,
greedy
,
math
2300
x1517
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x3884
1927E
Klever Permutation
constructive algorithms
,
math
,
two pointers
1400
x12664
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x18716
1927C
Choose the Different Ones!
brute force
,
greedy
,
math
1000
x25968
1927B
Following the String
constructive algorithms
,
greedy
,
strings
900
x30810
1927A
Make it White
greedy
,
strings
800
x40216
1926G
Vlad and Trouble at MIT
dfs and similar
,
dp
,
flows
,
graphs
,
greedy
,
implementation
,
trees
1900
x3052
1926F
Vlad and Avoiding X
bitmasks
,
brute force
,
dfs and similar
,
dp
,
implementation
2200
x1530
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x10393
1926D
Vlad and Division
bitmasks
,
greedy
1300
x13949
1926C
Vlad and a Sum of Sum of Digits
dp
,
implementation
1200
x23765
1926B
Vlad and Shapes
geometry
,
implementation
800
x30239
1926A
Vlad and the Best of Five
implementation
800
x43016
1925D
Good Trip
combinatorics
,
dp
,
math
,
probabilities
1900
x3290
1925B
A Balanced Problemset?
brute force
,
greedy
,
math
,
number theory
1200
x18524
1925A
We Got Everything Covered!
constructive algorithms
,
greedy
,
strings
800
x27437
1924F
Anti-Proxy Attendance
constructive algorithms
,
dp
,
interactive
,
ternary search
3500
x134
1924E
Paper Cutting Again
combinatorics
,
probabilities
3100
x398
1924D
Balanced Subsequences
combinatorics
,
dp
,
math
2700
x791
1924C
Fractal Origami
geometry
,
math
,
matrices
2400
x1059
1924B
Space Harbour
data structures
,
implementation
,
math
,
sortings
2100
x2310
1924A
Did We Get Everything Covered?
constructive algorithms
,
dp
,
greedy
,
shortest paths
,
strings
1500
x12579
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x338
1923E
Count Paths
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
2000
x3279
1923D
Slimes
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x6055
1923C
Find B
constructive algorithms
,
greedy
1400
x13484
1923B
Monsters Attack!
dp
,
greedy
,
implementation
1100
x16448
1923A
Moving Chips
greedy
,
implementation
800
x23503
1922F
Replace on Segment
dp
,
graph matchings
2500
x1182
1922E
Increasing Subsequences
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
math
1800
x7162
1922D
Berserk Monsters
brute force
,
data structures
,
dsu
,
implementation
,
math
1900
x5287
1922C
Closest Cities
greedy
,
implementation
,
math
1300
x17104
1922B
Forming Triangles
combinatorics
,
constructive algorithms
,
math
,
sortings
1200
x19288
1922A
Tricky Template
constructive algorithms
,
implementation
,
strings
800
x26055
1921G
Mischievous Shooter
brute force
,
data structures
,
divide and conquer
,
dp
,
implementation
2200
x1143
1921F
Sum of Progression
brute force
,
data structures
,
dp
,
implementation
,
math
1900
x3506
1921E
Eat the Chip
brute force
,
games
,
greedy
,
math
1600
x9045
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x20265
1921C
Sending Messages
greedy
,
math
900
x27630
1921B
Arranging Cats
greedy
,
implementation
800
x32253
1921A
Square
greedy
,
math
800
x40426
1920F2
Smooth Sailing (Hard Version)
binary search
,
data structures
,
dsu
,
geometry
,
graphs
,
trees
3000
x421
1920F1
Smooth Sailing (Easy Version)
binary search
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
shortest paths
2500
x896
1920E
Counting Binary Strings
combinatorics
,
dp
,
math
2100
x2409
1920D
Array Repetition
binary search
,
brute force
,
dsu
,
implementation
,
math
1900
x5172
1920C
Partitioning the Array
brute force
,
math
,
number theory
1600
x12052
1920B
Summation Game
games
,
greedy
,
math
,
sortings
1100
x19493
1920A
Satisfying Constraints
brute force
,
greedy
,
math
800
x26685
1919H
Tree Diameter
interactive
,
trees
2000
x133
1919G
Tree LGM
constructive algorithms
,
divide and conquer
,
games
,
trees
3500
x171
1919F2
Wine Factory (Hard Version)
data structures
,
dp
,
flows
,
greedy
,
matrices
2800
x750
1919F1
Wine Factory (Easy Version)
data structures
,
greedy
2300
x2046
1919E
Counting Prefixes
combinatorics
,
constructive algorithms
,
dp
,
implementation
,
math
2600
x786
1919D
01 Tree
constructive algorithms
,
data structures
,
dsu
,
greedy
,
sortings
,
trees
2100
x3636
1919C
Grouping Increases
data structures
,
dp
,
greedy
1400
x17096
1919B
Plus-Minus Split
greedy
800
x28953
1919A
Wallet Exchange
games
,
math
800
x31969
1918G
Permutation of Given
constructive algorithms
,
math
2700
x430
1918F
Caterpillar on a Tree
dfs and similar
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
2500
x793
1918E
ace5 and Task Order
constructive algorithms
,
divide and conquer
,
implementation
,
interactive
,
probabilities
,
sortings
2200
x1596
1918D
Blocking Elements
binary search
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4343
1918C
XOR-distance
bitmasks
,
greedy
,
implementation
,
math
1400
x12785
1918B
Minimize Inversions
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
900
x22377
1918A
Brick Wall
constructive algorithms
,
greedy
,
implementation
,
math
800
x28975
1917F
Construct Tree
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x908
1917E
Construct Matrix
constructive algorithms
,
math
2500
x1283
1917D
Yet Another Inversions Problem
combinatorics
,
data structures
,
dp
,
implementation
,
math
,
number theory
2300
x1679
1917C
Watering an Array
brute force
,
greedy
,
implementation
,
math
1600
x9537
1917B
Erase First or Second Letter
brute force
,
combinatorics
,
data structures
,
dp
,
strings
1100
x19778
1917A
Least Product
constructive algorithms
,
math
800
x24378
1916H2
Matrix Rank (Hard Version)
combinatorics
,
dp
,
math
,
matrices
,
string suffix structures
2700
x503
1916H1
Matrix Rank (Easy Version)
brute force
,
combinatorics
,
dp
,
math
,
matrices
2700
x585
1916G
Optimizations From Chelsu
divide and conquer
,
dp
,
number theory
,
trees
3500
x134
1916F
Group Division
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2900
x412
1916E
Happy Life in University
data structures
,
dfs and similar
,
greedy
,
trees
2300
x2116
1916D
Mathematical Problem
brute force
,
constructive algorithms
,
geometry
,
math
1700
x7974
1916C
Training Before the Olympiad
constructive algorithms
,
games
,
greedy
,
implementation
,
math
1200
x16870
1916B
Two Divisors
constructive algorithms
,
math
,
number theory
1000
x23946
1916A
2023
constructive algorithms
,
implementation
,
math
,
number theory
800
x24721
1915G
Bicycles
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
1800
x5532
1915F
Greetings
data structures
,
divide and conquer
,
sortings
1500
x11890
1915E
Romantic Glasses
data structures
,
greedy
,
math
1300
x18921
1915D
Unnatural Language Processing
greedy
,
implementation
,
strings
900
x28090
1915C
Can I Square?
binary search
,
implementation
800
x38238
1915B
Not Quite Latin Square
bitmasks
,
brute force
,
implementation
800
x39102
1915A
Odd One Out
bitmasks
,
implementation
800
x50833
1914G2
Light Bulbs (Hard Version)
combinatorics
,
data structures
,
dfs and similar
,
dp
,
graphs
,
hashing
2300
x1240
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1699
1914F
Programming Competition
dfs and similar
,
dp
,
graph matchings
,
greedy
,
trees
1900
x3746
1914E2
Game with Marbles (Hard Version)
games
,
greedy
,
sortings
1400
x11404
1914E1
Game with Marbles (Easy Version)
brute force
,
games
,
greedy
,
sortings
1400
x11296
1914D
Three Activities
brute force
,
dp
,
greedy
,
implementation
,
sortings
1200
x18665
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