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Codeforces Round (Div. 1 + Div. 2)
2 days
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combine-tags-by-or
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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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Custom test
Problems
#
Name
1873A
Short Sort
brute force
,
implementation
800
x49224
1872G
Replace With Product
brute force
,
greedy
,
math
2000
x4016
1872F
Selling a Menagerie
dfs and similar
,
dsu
,
graphs
,
implementation
,
math
1800
x5838
1872E
Data Structures Fan
binary search
,
bitmasks
,
data structures
,
dp
1500
x12151
1872D
Plus Minus Permutation
math
1200
x21205
1872C
Non-coprime Split
math
,
number theory
1100
x22162
1872B
The Corridor or There and Back Again
greedy
,
implementation
900
x26755
1872A
Two Vessels
brute force
,
greedy
,
math
800
x37480
1870H
Standard Graph Problem
data structures
,
graphs
,
greedy
,
trees
3500
x77
1870G
MEXanization
data structures
3300
x202
1870F
Lazy Numbers
binary search
,
math
2900
x464
1870E
Another MEX Problem
bitmasks
,
brute force
,
dp
,
shortest paths
2300
x2218
1870D
Prefix Purchase
greedy
,
implementation
,
sortings
1800
x6456
1870C
Colorful Table
binary search
,
data structures
,
dp
,
implementation
,
math
,
two pointers
1300
x10799
1870B
Friendly Arrays
bitmasks
,
greedy
,
math
1200
x13419
1870A
MEXanized Array
constructive algorithms
,
greedy
,
math
800
x18542
1869B
2D Traveling
geometry
,
math
,
shortest paths
,
sortings
1100
x14553
1869A
Make It Zero
constructive algorithms
900
x18811
1868F
LIS?
data structures
,
greedy
,
implementation
3500
x69
1868E
Min-Sum-Max
constructive algorithms
,
dp
,
greedy
3500
x73
1868D
Flower-like Pseudotree
constructive algorithms
,
graphs
,
greedy
,
implementation
,
trees
3000
x248
1868C
Travel Plan
combinatorics
,
dp
,
implementation
,
math
,
trees
2400
x1083
1868B2
Candy Party (Hard Version)
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
implementation
,
math
2100
x2286
1868B1
Candy Party (Easy Version)
bitmasks
,
constructive algorithms
,
graphs
,
greedy
,
implementation
,
math
1700
x6500
1868A
Fill in the Matrix
constructive algorithms
,
implementation
1300
x11243
1867F
Most Different Tree
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
,
hashing
2700
x400
1867E2
Salyg1n and Array (hard version)
constructive algorithms
,
interactive
2200
x2999
1867E1
Salyg1n and Array (simple version)
constructive algorithms
,
interactive
,
math
2000
x3534
1867D
Cyclic Operations
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
1800
x5362
1867C
Salyg1n and the MEX Game
constructive algorithms
,
data structures
,
games
,
greedy
,
interactive
1300
x10617
1867B
XOR Palindromes
bitmasks
,
constructive algorithms
,
strings
1100
x15913
1867A
green_gold_dog, array and permutation
constructive algorithms
,
sortings
800
x19270
1866M
Mighty Rock Tower
brute force
,
combinatorics
,
dp
,
math
,
probabilities
2400
x694
1866L
Lihmuf Balling
binary search
,
brute force
,
math
2400
x658
1866K
Keen Tree Calculation
binary search
,
data structures
,
dp
,
geometry
,
graphs
,
implementation
,
trees
2500
x413
1866J
Jackets and Packets
dp
2800
x270
1866I
Imagination Castle
dp
,
games
,
two pointers
2300
x675
1866H
Happy Sets
combinatorics
2100
x1536
1866G
Grouped Carriages
binary search
,
data structures
,
dp
,
flows
,
greedy
2100
x1526
1866F
Freak Joker Process
binary search
,
data structures
,
sortings
3100
x121
1866E
Elevators of Tamem
dp
2700
x277
1866D
Digital Wallet
dp
,
greedy
2300
x1199
1866C
Completely Searching for Inversions
dfs and similar
,
dp
,
graphs
1900
x2878
1866B
Battling with Numbers
combinatorics
,
math
,
number theory
1400
x7254
1866A
Ambitious Kid
math
800
x18372
1864I
Future Dominators
graphs
,
greedy
3500
x83
1864H
Asterism Stream
dp
,
math
,
matrices
3200
x271
1864G
Magic Square
combinatorics
,
constructive algorithms
,
implementation
3100
x253
1864F
Exotic Queries
data structures
,
implementation
,
sortings
2300
x1319
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2475
1864D
Matrix Cascade
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
1700
x6380
1864C
Divisor Chain
bitmasks
,
constructive algorithms
,
math
,
number theory
1300
x12682
1864B
Swap and Reverse
constructive algorithms
,
greedy
,
sortings
,
strings
1100
x14815
1864A
Increasing and Decreasing
constructive algorithms
,
greedy
,
implementation
,
math
800
x19808
1863I
Redundant Routes
constructive algorithms
,
dp
,
trees
3500
x70
1863H
Goldberg Machine 3
dp
,
trees
3500
x72
1863G
Swaps
combinatorics
,
dp
,
graphs
,
math
2800
x569
1863F
Divide, XOR, and Conquer
bitmasks
,
dp
,
math
2600
x1033
1863E
Speedrun
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
2100
x2624
1863D
Two-Colored Dominoes
constructive algorithms
,
greedy
1400
x8992
1863C
MEX Repetition
implementation
,
math
1100
x13450
1863B
Split Sort
greedy
,
math
,
sortings
1100
x14635
1863A
Channel
greedy
,
implementation
800
x17487
1862G
The Great Equalizer
binary search
,
data structures
,
math
,
sortings
2000
x2676
1862F
Magic Will Save the World
binary search
,
bitmasks
,
brute force
,
dp
1800
x5732
1862E
Kolya and Movie Theatre
constructive algorithms
,
data structures
,
greedy
1600
x9700
1862D
Ice Cream Balls
binary search
,
combinatorics
,
constructive algorithms
,
math
1300
x16151
1862C
Flower City Fence
binary search
,
data structures
,
implementation
,
sortings
1100
x19772
1862B
Sequence Game
constructive algorithms
800
x29029
1862A
Gift Carpet
dp
,
greedy
,
implementation
,
strings
800
x30990
1861F
Four Suits
binary search
,
bitmasks
,
flows
,
greedy
3200
x148
1861E
Non-Intersecting Subpermutations
combinatorics
,
dp
,
implementation
,
math
2300
x1629
1861D
Sorting By Multiplication
dp
,
greedy
1800
x6308
1861C
Queries for the Array
data structures
,
dfs and similar
,
implementation
,
strings
,
trees
1600
x9520
1861B
Two Binary Strings
constructive algorithms
,
dp
,
greedy
1000
x20225
1861A
Prime Deletion
constructive algorithms
,
math
800
x23177
1860F
Evaluate RBS
data structures
,
geometry
,
implementation
,
math
,
sortings
2900
x265
1860E
Fast Travel Text Editor
data structures
,
dfs and similar
,
graphs
,
shortest paths
2400
x1313
1860D
Balanced String
dp
2200
x2806
1860C
Game on Permutation
data structures
,
dp
,
games
,
greedy
1400
x12511
1860B
Fancy Coins
binary search
,
brute force
,
greedy
,
math
1200
x16119
1860A
Not a Substring
constructive algorithms
,
strings
900
x20885
1859F
Teleportation in Byteland
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
shortest paths
,
trees
3200
x371
1859E
Maximum Monogonosity
brute force
,
dp
,
math
2500
x1673
1859D
Andrey and Escape from Capygrad
binary search
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1800
x6579
1859C
Another Permutation Problem
brute force
,
dp
,
greedy
,
math
1200
x16378
1859B
Olya and Game with Arrays
constructive algorithms
,
greedy
,
math
,
sortings
1000
x24515
1859A
United We Stand
constructive algorithms
,
math
,
number theory
800
x29564
1858E2
Rollbacks (Hard Version)
data structures
,
interactive
,
trees
2600
x1009
1858E1
Rollbacks (Easy Version)
brute force
,
data structures
,
dfs and similar
,
trees
2500
x1252
1858D
Trees and Segments
brute force
,
data structures
,
dp
,
greedy
,
two pointers
2200
x2715
1858C
Yet Another Permutation Problem
constructive algorithms
,
greedy
,
math
,
number theory
1000
x22039
1858B
The Walkway
brute force
,
dp
,
greedy
,
math
,
number theory
1500
x10695
1858A
Buttons
games
,
greedy
,
math
800
x34653
1857G
Counting Graphs
combinatorics
,
divide and conquer
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2000
x4105
1857F
Sum and Product
binary search
,
data structures
,
math
1600
x10497
1857E
Power of Points
math
,
sortings
1500
x11582
1857D
Strong Vertices
math
,
sortings
,
trees
1300
x17856
1857C
Assembly via Minimums
greedy
,
sortings
1200
x23197
1857B
Maximum Rounding
greedy
,
implementation
,
math
1100
x22218
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