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Codeforces Round (Div. 2)
5 days
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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
1872C
Non-coprime Split
math
,
number theory
1100
x22579
1872B
The Corridor or There and Back Again
greedy
,
implementation
900
x27157
1872A
Two Vessels
brute force
,
greedy
,
math
800
x38060
1870H
Standard Graph Problem
data structures
,
graphs
,
greedy
,
trees
3500
x80
1870G
MEXanization
data structures
3300
x206
1870F
Lazy Numbers
binary search
,
math
2900
x469
1870E
Another MEX Problem
bitmasks
,
brute force
,
dp
,
shortest paths
2300
x2259
1870D
Prefix Purchase
greedy
,
implementation
,
sortings
1800
x6608
1870C
Colorful Table
binary search
,
data structures
,
dp
,
implementation
,
math
,
two pointers
1300
x11052
1870B
Friendly Arrays
bitmasks
,
greedy
,
math
1200
x13727
1870A
MEXanized Array
constructive algorithms
,
greedy
,
math
800
x18741
1869B
2D Traveling
geometry
,
math
,
shortest paths
,
sortings
1100
x15100
1869A
Make It Zero
constructive algorithms
900
x19740
1868F
LIS?
data structures
,
greedy
,
implementation
3500
x71
1868E
Min-Sum-Max
constructive algorithms
,
dp
,
greedy
3500
x77
1868D
Flower-like Pseudotree
constructive algorithms
,
graphs
,
greedy
,
implementation
,
trees
3000
x257
1868C
Travel Plan
combinatorics
,
dp
,
implementation
,
math
,
trees
2400
x1106
1868B2
Candy Party (Hard Version)
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
implementation
,
math
2100
x2322
1868B1
Candy Party (Easy Version)
bitmasks
,
constructive algorithms
,
graphs
,
greedy
,
implementation
,
math
1700
x6671
1868A
Fill in the Matrix
constructive algorithms
,
implementation
1300
x11528
1867F
Most Different Tree
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
,
hashing
2700
x406
1867E2
Salyg1n and Array (hard version)
constructive algorithms
,
interactive
2200
x3058
1867E1
Salyg1n and Array (simple version)
constructive algorithms
,
interactive
,
math
2000
x3603
1867D
Cyclic Operations
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
1800
x5515
1867C
Salyg1n and the MEX Game
constructive algorithms
,
data structures
,
games
,
greedy
,
interactive
1300
x10836
1867B
XOR Palindromes
bitmasks
,
constructive algorithms
,
strings
1100
x16274
1867A
green_gold_dog, array and permutation
constructive algorithms
,
sortings
800
x19582
1866M
Mighty Rock Tower
brute force
,
combinatorics
,
dp
,
math
,
probabilities
2400
x704
1866L
Lihmuf Balling
binary search
,
brute force
,
math
2400
x664
1866K
Keen Tree Calculation
binary search
,
data structures
,
dp
,
geometry
,
graphs
,
implementation
,
trees
2500
x416
1866J
Jackets and Packets
dp
2800
x271
1866I
Imagination Castle
dp
,
games
,
two pointers
2300
x684
1866H
Happy Sets
combinatorics
2100
x1558
1866G
Grouped Carriages
binary search
,
data structures
,
dp
,
flows
,
greedy
2100
x1548
1866F
Freak Joker Process
binary search
,
data structures
,
sortings
3100
x130
1866E
Elevators of Tamem
dp
2700
x279
1866D
Digital Wallet
dp
,
greedy
2300
x1222
1866C
Completely Searching for Inversions
dfs and similar
,
dp
,
graphs
1900
x2921
1866B
Battling with Numbers
combinatorics
,
math
,
number theory
1400
x7411
1866A
Ambitious Kid
math
800
x19449
1864I
Future Dominators
graphs
,
greedy
3500
x85
1864H
Asterism Stream
dp
,
math
,
matrices
3200
x277
1864G
Magic Square
combinatorics
,
constructive algorithms
,
implementation
3100
x255
1864F
Exotic Queries
data structures
,
implementation
,
sortings
2300
x1353
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2504
1864D
Matrix Cascade
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
1700
x6499
1864C
Divisor Chain
bitmasks
,
constructive algorithms
,
math
,
number theory
1300
x12973
1864B
Swap and Reverse
constructive algorithms
,
greedy
,
sortings
,
strings
1100
x14986
1864A
Increasing and Decreasing
constructive algorithms
,
greedy
,
implementation
,
math
800
x19985
1863I
Redundant Routes
constructive algorithms
,
dp
,
trees
3500
x72
1863H
Goldberg Machine 3
dp
,
trees
3500
x74
1863G
Swaps
combinatorics
,
dp
,
graphs
,
math
2800
x587
1863F
Divide, XOR, and Conquer
bitmasks
,
dp
,
math
2600
x1055
1863E
Speedrun
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
2100
x2657
1863D
Two-Colored Dominoes
constructive algorithms
,
greedy
1400
x9174
1863C
MEX Repetition
implementation
,
math
1100
x13643
1863B
Split Sort
greedy
,
math
,
sortings
1100
x14824
1863A
Channel
greedy
,
implementation
800
x17660
1862G
The Great Equalizer
binary search
,
data structures
,
math
,
sortings
2000
x2739
1862F
Magic Will Save the World
binary search
,
bitmasks
,
brute force
,
dp
1800
x5876
1862E
Kolya and Movie Theatre
constructive algorithms
,
data structures
,
greedy
1600
x10121
1862D
Ice Cream Balls
binary search
,
combinatorics
,
constructive algorithms
,
math
1300
x16481
1862C
Flower City Fence
binary search
,
data structures
,
implementation
,
sortings
1100
x20067
1862B
Sequence Game
constructive algorithms
800
x29970
1862A
Gift Carpet
dp
,
greedy
,
implementation
,
strings
800
x31496
1861F
Four Suits
binary search
,
bitmasks
,
flows
,
greedy
3200
x188
1861E
Non-Intersecting Subpermutations
combinatorics
,
dp
,
implementation
,
math
2300
x1648
1861D
Sorting By Multiplication
dp
,
greedy
1800
x6448
1861C
Queries for the Array
data structures
,
dfs and similar
,
implementation
,
strings
,
trees
1600
x9707
1861B
Two Binary Strings
constructive algorithms
,
dp
,
greedy
1000
x20687
1861A
Prime Deletion
constructive algorithms
,
math
800
x23461
1860F
Evaluate RBS
data structures
,
geometry
,
implementation
,
math
,
sortings
2900
x266
1860E
Fast Travel Text Editor
data structures
,
dfs and similar
,
graphs
,
shortest paths
2400
x1336
1860D
Balanced String
dp
2200
x2842
1860C
Game on Permutation
data structures
,
dp
,
games
,
greedy
1400
x12757
1860B
Fancy Coins
binary search
,
brute force
,
greedy
,
math
1200
x16386
1860A
Not a Substring
constructive algorithms
,
strings
900
x21187
1859F
Teleportation in Byteland
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
shortest paths
,
trees
3200
x381
1859E
Maximum Monogonosity
brute force
,
dp
,
math
2500
x1693
1859D
Andrey and Escape from Capygrad
binary search
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1800
x6700
1859C
Another Permutation Problem
brute force
,
dp
,
greedy
,
math
1200
x16560
1859B
Olya and Game with Arrays
constructive algorithms
,
greedy
,
math
,
sortings
1000
x25294
1859A
United We Stand
constructive algorithms
,
math
,
number theory
800
x30400
1858E2
Rollbacks (Hard Version)
data structures
,
interactive
,
trees
2600
x1021
1858E1
Rollbacks (Easy Version)
brute force
,
data structures
,
dfs and similar
,
trees
2500
x1268
1858D
Trees and Segments
brute force
,
data structures
,
dp
,
greedy
,
two pointers
2200
x2737
1858C
Yet Another Permutation Problem
constructive algorithms
,
greedy
,
math
,
number theory
1000
x22388
1858B
The Walkway
brute force
,
dp
,
greedy
,
math
,
number theory
1500
x10920
1858A
Buttons
games
,
greedy
,
math
800
x35762
1857G
Counting Graphs
combinatorics
,
divide and conquer
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2000
x4208
1857F
Sum and Product
binary search
,
data structures
,
math
1600
x10796
1857E
Power of Points
math
,
sortings
1500
x11840
1857D
Strong Vertices
math
,
sortings
,
trees
1300
x18345
1857C
Assembly via Minimums
greedy
,
sortings
1200
x24044
1857B
Maximum Rounding
greedy
,
implementation
,
math
1100
x22460
1857A
Array Coloring
greedy
,
math
800
x45179
1856E2
PermuTree (hard version)
bitmasks
,
dfs and similar
,
dp
,
fft
,
greedy
,
implementation
,
math
,
trees
2700
x1335
1856E1
PermuTree (easy version)
dfs and similar
,
dp
,
trees
1800
x5033
1856D
More Wrong
divide and conquer
,
interactive
2100
x3155
1856C
To Become Max
binary search
,
brute force
,
data structures
,
dp
1600
x11553
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