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Refact.ai Match 1 (Codeforces Round 985)
12:49:03
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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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Custom test
Problems
#
Name
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2939
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x7482
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x451
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x1366
1935D
Exam in MAC
binary search
,
combinatorics
,
implementation
,
math
1800
x8279
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x8215
1935B
Informatics in MAC
constructive algorithms
1200
x18616
1935A
Entertainment in MAC
constructive algorithms
,
strings
800
x27993
1934E
Weird LCM Operations
brute force
,
constructive algorithms
,
number theory
3000
x239
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x1391
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x3535
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x6826
1934B
Yet Another Coin Problem
brute force
,
dp
,
greedy
,
math
1200
x18998
1934A
Too Min Too Max
greedy
,
math
800
x25454
1933G
Turtle Magic: Royal Turtle Shell Pattern
bitmasks
,
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
2300
x981
1933F
Turtle Mission: Robot and the Earthquake
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2501
1933E
Turtle vs. Rabbit Race: Optimal Trainings
binary search
,
implementation
,
math
,
ternary search
1500
x11289
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x20336
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x22716
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x32992
1933A
Turtle Puzzle: Rearrange and Negate
greedy
,
math
,
sortings
800
x38247
1932G
Moving Platforms
graphs
,
math
,
number theory
,
shortest paths
2300
x1086
1932F
Feed Cats
data structures
,
dp
,
sortings
1900
x4151
1932E
Final Countdown
implementation
,
math
,
number theory
1600
x8268
1932D
Card Game
greedy
,
implementation
1400
x11514
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x15846
1932B
Chaya Calendar
number theory
1100
x20867
1932A
Thorns and Coins
dp
,
greedy
,
implementation
800
x29734
1931G
One-Dimensional Puzzle
combinatorics
,
math
,
number theory
2000
x2867
1931F
Chat Screenshots
combinatorics
,
dfs and similar
,
graphs
1700
x8115
1931E
Anna and the Valentine's Day Gift
games
,
greedy
,
math
,
sortings
1400
x16067
1931D
Divisible Pairs
combinatorics
,
math
,
number theory
1300
x19136
1931C
Make Equal Again
brute force
,
greedy
,
math
1000
x29271
1931B
Make Equal
greedy
800
x32286
1931A
Recovering a Small String
brute force
,
strings
800
x36285
1930I
Counting Is Fun
combinatorics
3500
x73
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x176
1930G
Prefix Max Set Counting
data structures
,
dp
,
trees
3100
x338
1930F
Maximize the Difference
bitmasks
,
brute force
,
dfs and similar
2700
x714
1930E
2..3...4.... Wonderful! Wonderful!
combinatorics
,
dp
,
math
2400
x1143
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2645
1930D1
Sum over all Substrings (Easy Version)
brute force
,
dp
,
greedy
,
strings
1800
x4145
1930C
Lexicographically Largest
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
1700
x7140
1930B
Permutation Printing
brute force
,
constructive algorithms
,
math
1000
x15356
1930A
Maximise The Score
greedy
,
sortings
800
x18646
1929F
Sasha and the Wedding Binary Search Tree
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
math
,
trees
2300
x1808
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1710
1929D
Sasha and a Walk in the City
combinatorics
,
dp
,
math
,
trees
1900
x4823
1929C
Sasha and the Casino
binary search
,
brute force
,
constructive algorithms
,
games
,
greedy
,
math
1400
x14997
1929B
Sasha and the Drawing
constructive algorithms
,
greedy
,
math
800
x25342
1929A
Sasha and the Beautiful Array
constructive algorithms
,
greedy
,
math
,
sortings
800
x31605
1928F
Digital Patterns
combinatorics
,
data structures
,
implementation
,
math
2900
x243
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1732
1928D
Lonely Mountain Dungeons
brute force
,
data structures
,
greedy
,
math
,
ternary search
1900
x4293
1928C
Physical Education Lesson
brute force
,
math
,
number theory
1600
x8633
1928B
Equalize
binary search
,
greedy
,
sortings
,
two pointers
1200
x17622
1928A
Rectangle Cutting
geometry
,
math
800
x22719
1927G
Paint Charges
data structures
,
dp
,
greedy
,
math
2300
x1692
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x4417
1927E
Klever Permutation
constructive algorithms
,
math
,
two pointers
1400
x14136
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x21767
1927C
Choose the Different Ones!
brute force
,
greedy
,
math
1000
x28116
1927B
Following the String
constructive algorithms
,
greedy
,
strings
900
x33372
1927A
Make it White
greedy
,
strings
800
x43720
1926G
Vlad and Trouble at MIT
dfs and similar
,
dp
,
flows
,
graphs
,
greedy
,
implementation
,
trees
1900
x3600
1926F
Vlad and Avoiding X
bitmasks
,
brute force
,
dfs and similar
,
dp
,
implementation
2200
x1719
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x12033
1926D
Vlad and Division
bitmasks
,
greedy
1300
x15648
1926C
Vlad and a Sum of Sum of Digits
dp
,
implementation
1200
x26879
1926B
Vlad and Shapes
geometry
,
implementation
800
x32597
1926A
Vlad and the Best of Five
implementation
800
x48670
1925D
Good Trip
combinatorics
,
dp
,
math
,
probabilities
1900
x3679
1925B
A Balanced Problemset?
brute force
,
greedy
,
math
,
number theory
1200
x20221
1925A
We Got Everything Covered!
constructive algorithms
,
greedy
,
strings
800
x28951
1924F
Anti-Proxy Attendance
constructive algorithms
,
dp
,
interactive
,
ternary search
3500
x154
1924E
Paper Cutting Again
combinatorics
,
probabilities
3100
x441
1924D
Balanced Subsequences
combinatorics
,
dp
,
math
2700
x1013
1924C
Fractal Origami
geometry
,
math
,
matrices
2400
x1176
1924B
Space Harbour
data structures
,
implementation
,
math
,
sortings
2100
x2596
1924A
Did We Get Everything Covered?
constructive algorithms
,
dp
,
greedy
,
shortest paths
,
strings
1500
x14073
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x378
1923E
Count Paths
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
2000
x3916
1923D
Slimes
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x6860
1923C
Find B
constructive algorithms
,
greedy
1400
x15247
1923B
Monsters Attack!
dp
,
greedy
,
implementation
1100
x17783
1923A
Moving Chips
greedy
,
implementation
800
x24762
1922F
Replace on Segment
dp
,
graph matchings
2500
x1414
1922E
Increasing Subsequences
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
math
1800
x7786
1922D
Berserk Monsters
brute force
,
data structures
,
dsu
,
implementation
,
math
1900
x5747
1922C
Closest Cities
greedy
,
implementation
,
math
1300
x18656
1922B
Forming Triangles
combinatorics
,
constructive algorithms
,
math
,
sortings
1200
x20773
1922A
Tricky Template
constructive algorithms
,
implementation
,
strings
800
x27073
1921G
Mischievous Shooter
brute force
,
data structures
,
divide and conquer
,
dp
,
implementation
2200
x1252
1921F
Sum of Progression
brute force
,
data structures
,
dp
,
implementation
,
math
1900
x3917
1921E
Eat the Chip
brute force
,
games
,
greedy
,
math
1600
x9872
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x21757
1921C
Sending Messages
greedy
,
math
900
x29506
1921B
Arranging Cats
greedy
,
implementation
800
x33909
1921A
Square
greedy
,
math
800
x43614
1920F2
Smooth Sailing (Hard Version)
binary search
,
data structures
,
dsu
,
geometry
,
graphs
,
trees
3000
x535
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