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Before contest
Codeforces Round 988 (Div. 3)
28:36:38
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Difficulty:
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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
1423N
BubbleSquare Tokens
3500
x151
1423M
Milutin's Plums
interactive
2800
x166
1423L
Light switches
meet-in-the-middle
2600
x477
1423K
Lonely Numbers
binary search
,
math
,
number theory
,
two pointers
1600
x4882
1423J
Bubble Cup hypothesis
bitmasks
,
constructive algorithms
,
dp
,
math
2400
x792
1423I
Lookup Tables
bitmasks
3000
x106
1423H
Virus
data structures
,
divide and conquer
,
dsu
,
graphs
2500
x534
1423G
Growing flowers
data structures
3500
x215
1423F
Coins
math
2700
x380
1423E
5G Antenna Towers
geometry
2700
x80
1423D
Does anyone else hate the wind?
3100
x40
1423C
Dušan's Railway
divide and conquer
,
graphs
,
trees
3500
x143
1423B
Valuable Paper
binary search
,
flows
,
graph matchings
,
graphs
1900
x1819
1423A
Wakanda Forever
3500
x80
1422F
Boring Queries
data structures
,
math
,
number theory
2700
x1043
1422E
Minlexes
dp
,
greedy
,
implementation
,
strings
2700
x751
1422D
Returning Home
graphs
,
shortest paths
,
sortings
2300
x2830
1422C
Bargain
combinatorics
,
dp
,
math
1700
x8279
1422B
Nice Matrix
greedy
,
implementation
,
math
1300
x14442
1422A
Fence
geometry
,
math
800
x21015
1421E
Swedish Heroes
brute force
,
dp
,
implementation
2700
x703
1421D
Hexagons
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
,
shortest paths
1900
x4183
1421C
Palindromifier
constructive algorithms
,
strings
1400
x12855
1421B
Putting Bricks in the Wall
constructive algorithms
,
implementation
1100
x13123
1421A
XORwice
bitmasks
,
greedy
,
math
800
x29370
1420E
Battle Lemmings
dp
,
greedy
2500
x938
1420D
Rescue Nibel!
combinatorics
,
data structures
,
sortings
1800
x7640
1420C2
Pokémon Army (hard version)
data structures
,
divide and conquer
,
dp
,
greedy
,
implementation
2100
x4722
1420C1
Pokémon Army (easy version)
constructive algorithms
,
dp
,
greedy
1300
x17691
1420B
Rock and Lever
bitmasks
,
math
1200
x26167
1420A
Cubes Sorting
math
,
sortings
900
x23525
1419F
Rain of Fire
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
2800
x493
1419E
Decryption
constructive algorithms
,
implementation
,
math
,
number theory
2100
x3298
1419D2
Sage's Birthday (hard version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x15701
1419D1
Sage's Birthday (easy version)
binary search
,
constructive algorithms
,
greedy
,
sortings
1000
x24518
1419C
Killjoy
greedy
,
implementation
,
math
1500
x15469
1419B
Stairs
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
1200
x16313
1419A
Digit Game
games
,
greedy
,
implementation
900
x19607
1418G
Three Occurrences
data structures
,
divide and conquer
,
hashing
,
two pointers
2500
x2000
1418F
Equal Product
data structures
,
math
,
number theory
,
two pointers
3000
x373
1418E
Expected Damage
binary search
,
combinatorics
,
probabilities
2400
x1892
1418D
Trash Problem
data structures
,
implementation
2100
x4386
1418C
Mortal Kombat Tower
dp
,
graphs
,
greedy
,
shortest paths
1500
x20348
1418B
Negative Prefixes
greedy
,
sortings
1300
x16709
1418A
Buying Torches
math
1000
x23445
1417B
Two Arrays
greedy
,
math
,
sortings
1100
x14478
1417A
Copy-paste
greedy
,
math
800
x18298
1416F
Showing Off
flows
,
graph matchings
,
greedy
,
implementation
3300
x468
1416E
Split
binary search
,
data structures
,
dp
,
greedy
3200
x345
1416D
Graph and Queries
data structures
,
dsu
,
graphs
,
implementation
,
trees
2600
x2106
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x4473
1416B
Make Them Equal
constructive algorithms
,
greedy
,
math
2000
x6164
1416A
k-Amazing Numbers
binary search
,
data structures
,
implementation
,
two pointers
1500
x12680
1415F
Cakes for Clones
dp
2900
x490
1415E
New Game Plus!
constructive algorithms
,
greedy
,
math
2200
x2741
1415D
XOR-gun
bitmasks
,
brute force
,
constructive algorithms
2000
x5491
1415C
Bouncing Ball
brute force
,
dp
,
implementation
1400
x10983
1415B
Repainting Street
brute force
,
brute force
,
greedy
1100
x12205
1415A
Prison Break
brute force
,
math
800
x15206
1413F
Roads and Ramen
data structures
,
trees
2800
x788
1413E
Solo mid Oracle
greedy
,
math
,
ternary search
2100
x2038
1413D
Shurikens
data structures
,
greedy
,
implementation
1700
x6528
1413C
Perform Easily
binary search
,
brute force
,
dp
,
implementation
,
sortings
,
two pointers
1900
x5755
1413B
A New Technique
implementation
1100
x11731
1413A
Finding Sasuke
constructive algorithms
,
math
800
x14822
1411G
No Game No Life
bitmasks
,
games
,
math
,
matrices
2700
x676
1411F
The Thorny Path
greedy
,
math
3000
x376
1411E
Poman Numbers
bitmasks
,
greedy
,
math
,
strings
2300
x1662
1411D
Grime Zoo
brute force
,
greedy
,
implementation
,
strings
2100
x2533
1411C
Peaceful Rooks
dfs and similar
,
dsu
,
graphs
1700
x8029
1411B
Fair Numbers
brute force
,
number theory
1000
x19777
1411A
In-game Chat
implementation
800
x20690
1409F
Subsequences of Length Two
dp
,
strings
2100
x4481
1409E
Two Platforms
binary search
,
dp
,
sortings
,
two pointers
1800
x7873
1409D
Decrease the Sum of Digits
greedy
,
math
1500
x19534
1409C
Yet Another Array Restoration
brute force
,
math
,
number theory
1200
x23416
1409B
Minimum Product
brute force
,
greedy
,
math
1100
x29118
1409A
Yet Another Two Integers Problem
greedy
,
math
800
x67230
1408I
Bitwise Magic
dp
,
math
3200
x177
1408H
Rainbow Triples
binary search
,
data structures
,
flows
,
greedy
3300
x410
1408G
Clusterization Counting
combinatorics
,
dp
,
dsu
,
fft
,
graphs
,
trees
2700
x1068
1408F
Two Different
constructive algorithms
,
divide and conquer
2300
x2411
1408E
Avoid Rainbow Cycles
data structures
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x2008
1408D
Searchlights
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
sortings
,
two pointers
2000
x4346
1408C
Discrete Acceleration
binary search
,
dp
,
implementation
,
math
,
two pointers
1500
x8887
1408B
Arrays Sum
constructive algorithms
,
greedy
,
math
1400
x9994
1408A
Circle Coloring
constructive algorithms
800
x12513
1407E
Egor in the Republic of Dagestan
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
2500
x1714
1407D
Discrete Centrifugal Jumps
data structures
,
dp
,
graphs
2200
x4980
1407C
Chocolate Bunny
constructive algorithms
,
interactive
,
math
,
two pointers
1600
x12153
1407B
Big Vova
brute force
,
greedy
,
math
,
number theory
1300
x17082
1407A
Ahahahahahahahaha
constructive algorithms
,
math
1100
x20488
1406E
Deleting Numbers
interactive
,
math
,
number theory
2600
x1715
1406D
Three Sequences
constructive algorithms
,
data structures
,
greedy
,
math
2200
x3527
1406C
Link Cut Centroids
constructive algorithms
,
dfs and similar
,
graphs
,
trees
1700
x10377
1406B
Maximum Product
brute force
,
dp
,
greedy
,
implementation
,
sortings
1200
x22766
1406A
Subset Mex
greedy
,
implementation
,
math
900
x21556
1405B
Array Cancellation
constructive algorithms
,
implementation
1000
x21667
1405A
Permutation Forgery
constructive algorithms
800
x21489
1404E
Bricks
flows
,
graph matchings
,
graphs
2800
x1250
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