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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
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shortest paths
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string suffix structures
strings
ternary search
trees
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Problems
#
Name
1934E
Weird LCM Operations
brute force
,
constructive algorithms
,
number theory
3000
x182
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x1187
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x3064
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x6023
1934B
Yet Another Coin Problem
brute force
,
dp
,
greedy
,
math
1200
x16582
1934A
Too Min Too Max
greedy
,
math
800
x23308
1933G
Turtle Magic: Royal Turtle Shell Pattern
bitmasks
,
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
2300
x863
1933F
Turtle Mission: Robot and the Earthquake
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2196
1933E
Turtle vs. Rabbit Race: Optimal Trainings
binary search
,
implementation
,
math
,
ternary search
1500
x9664
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x17701
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x20420
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x29829
1933A
Turtle Puzzle: Rearrange and Negate
greedy
,
math
,
sortings
800
x35332
1932G
Moving Platforms
graphs
,
math
,
number theory
,
shortest paths
2300
x874
1932F
Feed Cats
data structures
,
dp
,
sortings
1900
x3370
1932E
Final Countdown
implementation
,
math
,
number theory
1600
x6757
1932D
Card Game
greedy
,
implementation
1400
x9852
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x13617
1932B
Chaya Calendar
number theory
1100
x18326
1932A
Thorns and Coins
dp
,
greedy
,
implementation
800
x26632
1931G
One-Dimensional Puzzle
combinatorics
,
math
,
number theory
2000
x2437
1931F
Chat Screenshots
combinatorics
,
dfs and similar
,
graphs
1700
x6910
1931E
Anna and the Valentine's Day Gift
games
,
greedy
,
math
,
sortings
1400
x13277
1931D
Divisible Pairs
combinatorics
,
math
,
number theory
1300
x15776
1931C
Make Equal Again
brute force
,
greedy
,
math
1000
x25981
1931B
Make Equal
greedy
800
x29928
1931A
Recovering a Small String
brute force
,
strings
800
x33484
1930I
Counting Is Fun
combinatorics
3500
x50
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x120
1930G
Prefix Max Set Counting
data structures
,
dp
,
trees
3100
x247
1930F
Maximize the Difference
bitmasks
,
brute force
,
dfs and similar
2700
x612
1930E
2..3...4.... Wonderful! Wonderful!
combinatorics
,
dp
,
math
2400
x982
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2357
1930D1
Sum over all Substrings (Easy Version)
brute force
,
dp
,
greedy
,
strings
1800
x3676
1930C
Lexicographically Largest
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
1700
x6394
1930B
Permutation Printing
brute force
,
constructive algorithms
,
math
1000
x13557
1930A
Maximise The Score
greedy
,
sortings
800
x17109
1929F
Sasha and the Wedding Binary Search Tree
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
math
,
trees
2300
x1623
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1507
1929D
Sasha and a Walk in the City
combinatorics
,
dp
,
math
,
trees
1900
x4156
1929C
Sasha and the Casino
binary search
,
brute force
,
constructive algorithms
,
games
,
greedy
,
math
1400
x13192
1929B
Sasha and the Drawing
constructive algorithms
,
greedy
,
math
800
x23738
1929A
Sasha and the Beautiful Array
constructive algorithms
,
greedy
,
math
,
sortings
800
x28828
1928F
Digital Patterns
combinatorics
,
data structures
,
implementation
,
math
2900
x209
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1538
1928D
Lonely Mountain Dungeons
brute force
,
data structures
,
greedy
,
math
,
ternary search
1900
x3725
1928C
Physical Education Lesson
brute force
,
math
,
number theory
1600
x7449
1928B
Equalize
binary search
,
greedy
,
sortings
,
two pointers
1200
x15215
1928A
Rectangle Cutting
geometry
,
math
800
x21130
1927G
Paint Charges
data structures
,
dp
,
greedy
,
math
2300
x1490
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x3779
1927E
Klever Permutation
constructive algorithms
,
math
,
two pointers
1400
x12366
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x18216
1927C
Choose the Different Ones!
brute force
,
greedy
,
math
1000
x25508
1927B
Following the String
constructive algorithms
,
greedy
,
strings
900
x30296
1927A
Make it White
greedy
,
strings
800
x39627
1926G
Vlad and Trouble at MIT
dfs and similar
,
dp
,
flows
,
graphs
,
greedy
,
implementation
,
trees
1900
x2931
1926F
Vlad and Avoiding X
bitmasks
,
brute force
,
dfs and similar
,
dp
,
implementation
2200
x1476
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x9961
1926D
Vlad and Division
bitmasks
,
greedy
1300
x13493
1926C
Vlad and a Sum of Sum of Digits
dp
,
implementation
1200
x23006
1926B
Vlad and Shapes
geometry
,
implementation
800
x29666
1926A
Vlad and the Best of Five
implementation
800
x41874
1925D
Good Trip
combinatorics
,
dp
,
math
,
probabilities
1900
x3209
1925B
A Balanced Problemset?
brute force
,
greedy
,
math
,
number theory
1200
x18179
1925A
We Got Everything Covered!
constructive algorithms
,
greedy
,
strings
800
x27113
1924F
Anti-Proxy Attendance
constructive algorithms
,
dp
,
interactive
,
ternary search
3500
x127
1924E
Paper Cutting Again
combinatorics
,
probabilities
3100
x391
1924D
Balanced Subsequences
combinatorics
,
dp
,
math
2700
x770
1924C
Fractal Origami
geometry
,
math
,
matrices
2400
x1037
1924B
Space Harbour
data structures
,
implementation
,
math
,
sortings
2100
x2273
1924A
Did We Get Everything Covered?
constructive algorithms
,
dp
,
greedy
,
shortest paths
,
strings
1500
x12304
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x329
1923E
Count Paths
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
2000
x3169
1923D
Slimes
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x5875
1923C
Find B
constructive algorithms
,
greedy
1400
x13099
1923B
Monsters Attack!
dp
,
greedy
,
implementation
1100
x16113
1923A
Moving Chips
greedy
,
implementation
800
x23209
1922F
Replace on Segment
dp
,
graph matchings
2500
x1162
1922E
Increasing Subsequences
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
math
1800
x7032
1922D
Berserk Monsters
brute force
,
data structures
,
dsu
,
implementation
,
math
1900
x5219
1922C
Closest Cities
greedy
,
implementation
,
math
1300
x16838
1922B
Forming Triangles
combinatorics
,
constructive algorithms
,
math
,
sortings
1200
x18983
1922A
Tricky Template
constructive algorithms
,
implementation
,
strings
800
x25854
1921G
Mischievous Shooter
brute force
,
data structures
,
divide and conquer
,
dp
,
implementation
2200
x1120
1921F
Sum of Progression
brute force
,
data structures
,
dp
,
implementation
,
math
1900
x3431
1921E
Eat the Chip
brute force
,
games
,
greedy
,
math
1600
x8891
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x19939
1921C
Sending Messages
greedy
,
math
900
x27254
1921B
Arranging Cats
greedy
,
implementation
800
x31936
1921A
Square
greedy
,
math
800
x39868
1920F2
Smooth Sailing (Hard Version)
binary search
,
data structures
,
dsu
,
geometry
,
graphs
,
trees
3000
x398
1920F1
Smooth Sailing (Easy Version)
binary search
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
shortest paths
2500
x872
1920E
Counting Binary Strings
combinatorics
,
dp
,
math
2100
x2354
1920D
Array Repetition
binary search
,
brute force
,
dsu
,
implementation
,
math
1900
x5086
1920C
Partitioning the Array
brute force
,
math
,
number theory
1600
x11786
1920B
Summation Game
games
,
greedy
,
math
,
sortings
1100
x19236
1920A
Satisfying Constraints
brute force
,
greedy
,
math
800
x26447
1919H
Tree Diameter
interactive
,
trees
2000
x128
1919G
Tree LGM
constructive algorithms
,
divide and conquer
,
games
,
trees
3500
x170
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