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Before contest
Codeforces Round 974 (Div. 3)
09:08:33
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→ Filter Problems
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
1437E
Make It Increasing
binary search
,
constructive algorithms
,
data structures
,
dp
,
implementation
2200
x3428
1437D
Minimal Height Tree
graphs
,
greedy
,
shortest paths
,
trees
1600
x12705
1437C
Chef Monocarp
dp
,
flows
,
graph matchings
,
greedy
,
math
,
sortings
1800
x10459
1437B
Reverse Binary Strings
constructive algorithms
,
greedy
1200
x19138
1437A
Marketing Scheme
brute force
,
constructive algorithms
,
greedy
,
math
800
x17999
1436F
Sum Over Subsets
combinatorics
,
math
,
number theory
2800
x524
1436E
Complicated Computations
binary search
,
data structures
,
two pointers
2400
x2257
1436D
Bandit in a City
binary search
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x6035
1436C
Binary Search
binary search
,
combinatorics
1500
x10787
1436B
Prime Square
constructive algorithms
,
math
900
x20542
1436A
Reorder
math
800
x22652
1434E
A Convex Game
dsu
,
games
3500
x175
1433G
Reducing Delivery Cost
brute force
,
graphs
,
shortest paths
2100
x4315
1433F
Zero Remainder Sum
dp
2100
x6036
1433E
Two Round Dances
combinatorics
,
math
1300
x18414
1433D
Districts Connection
constructive algorithms
,
dfs and similar
1200
x23034
1433C
Dominant Piranha
constructive algorithms
,
greedy
900
x26934
1433B
Yet Another Bookshelf
greedy
,
implementation
800
x28369
1433A
Boring Apartments
implementation
,
math
800
x52089
1431J
Zero-XOR Array
*special problem
,
dp
3400
x44
1431I
Cyclic Shifts
*special problem
,
strings
2900
x46
1431H
Rogue-like Game
*special problem
,
brute force
,
greedy
,
two pointers
2600
x67
1431G
Number Deletion Game
*special problem
,
dp
,
games
,
greedy
2100
x188
1431F
Neural Network Problem
*special problem
,
binary search
,
greedy
2100
x156
1431E
Chess Match
*special problem
2000
x221
1431D
Used Markers
*special problem
,
greedy
1500
x455
1431C
Black Friday
*special problem
,
implementation
1600
x703
1431B
Polycarp and the Language of Gods
*special problem
,
implementation
,
two pointers
1400
x1009
1431A
Selling Hamburgers
*special problem
800
x1859
1430G
Yet Another DAG Problem
bitmasks
,
dfs and similar
,
dp
,
flows
,
graphs
,
math
2600
x702
1430F
Realistic Gameplay
dp
,
greedy
2600
x902
1430E
String Reversal
data structures
,
greedy
,
strings
1900
x6474
1430D
String Deletion
binary search
,
data structures
,
greedy
,
two pointers
1700
x8783
1430C
Numbers on Whiteboard
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
1000
x24404
1430B
Barrels
greedy
,
implementation
,
sortings
800
x19357
1430A
Number of Apartments
brute force
,
constructive algorithms
,
math
900
x20859
1428H
Rotary Laser Lock
binary search
,
interactive
3500
x108
1428G2
Lucky Numbers (Hard Version)
dp
,
greedy
3000
x631
1428G1
Lucky Numbers (Easy Version)
dp
,
greedy
2900
x566
1428F
Fruit Sequences
binary search
,
data structures
,
divide and conquer
,
dp
,
two pointers
2400
x2294
1428E
Carrots for Rabbits
binary search
,
data structures
,
greedy
,
math
,
sortings
2200
x3637
1428D
Bouncing Boomerangs
constructive algorithms
,
greedy
,
implementation
1900
x4474
1428C
ABBB
brute force
,
data structures
,
greedy
,
strings
1100
x20174
1428B
Belted Rooms
graphs
,
implementation
1200
x14358
1428A
Box is Pull
math
800
x16298
1427H
Prison Break
binary search
,
games
,
geometry
,
ternary search
3500
x77
1427G
One Billion Shades of Grey
flows
,
graphs
3300
x345
1427F
Boring Card Game
data structures
,
greedy
,
trees
3200
x313
1427E
Xum
bitmasks
,
constructive algorithms
,
math
,
matrices
,
number theory
2500
x1400
1427D
Unshuffling a Deck
constructive algorithms
,
implementation
2000
x3494
1427C
The Hard Work of Paparazzi
dp
2000
x5658
1427B
Chess Cheater
greedy
,
implementation
,
sortings
1400
x10883
1427A
Avoiding Zero
math
,
sortings
900
x17203
1426F
Number of Subsequences
combinatorics
,
dp
,
strings
2000
x5327
1426E
Rock, Paper, Scissors
brute force
,
constructive algorithms
,
flows
,
greedy
,
math
1800
x7401
1426D
Non-zero Segments
constructive algorithms
,
data structures
,
greedy
,
sortings
1500
x15955
1426C
Increase and Copy
binary search
,
constructive algorithms
,
math
1100
x19341
1426B
Symmetric Matrix
implementation
900
x20623
1426A
Floor Number
implementation
,
math
800
x47741
1425I
Impressive Harvesting of The Orchard
data structures
2800
x237
1425H
Huge Boxes of Animal Toys
constructive algorithms
1300
x4153
1425F
Flamingoes of Mystery
interactive
1400
x5648
1425E
Excitation of Atoms
greedy
,
implementation
2200
x934
1425D
Danger of Mad Snakes
combinatorics
,
dp
,
math
2300
x829
1425C
Captain of Knights
math
3100
x41
1425B
Blue and Red of Our Faculty!
divide and conquer
,
dp
2600
x280
1425A
Arena of Greed
games
,
greedy
1400
x6503
1424M
Ancient Language
graphs
,
sortings
2200
x530
1424G
Years
data structures
,
sortings
1300
x5804
1423N
BubbleSquare Tokens
3500
x151
1423M
Milutin's Plums
interactive
2800
x154
1423L
Light switches
meet-in-the-middle
2600
x464
1423K
Lonely Numbers
binary search
,
math
,
number theory
,
two pointers
1600
x4833
1423J
Bubble Cup hypothesis
bitmasks
,
constructive algorithms
,
dp
,
math
2400
x773
1423I
Lookup Tables
bitmasks
3000
x105
1423H
Virus
data structures
,
divide and conquer
,
dsu
,
graphs
2500
x523
1423G
Growing flowers
data structures
3500
x214
1423F
Coins
math
2700
x376
1423E
5G Antenna Towers
geometry
2700
x76
1423D
Does anyone else hate the wind?
3100
x39
1423C
Dušan's Railway
divide and conquer
,
graphs
,
trees
3500
x140
1423B
Valuable Paper
binary search
,
flows
,
graph matchings
,
graphs
1900
x1806
1423A
Wakanda Forever
3500
x75
1422F
Boring Queries
data structures
,
math
,
number theory
2700
x1023
1422E
Minlexes
dp
,
greedy
,
implementation
,
strings
2700
x742
1422D
Returning Home
graphs
,
shortest paths
,
sortings
2300
x2774
1422C
Bargain
combinatorics
,
dp
,
math
1700
x8216
1422B
Nice Matrix
greedy
,
implementation
,
math
1300
x14389
1422A
Fence
geometry
,
math
800
x20866
1421E
Swedish Heroes
brute force
,
dp
,
implementation
2700
x695
1421D
Hexagons
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
,
shortest paths
1900
x4152
1421C
Palindromifier
constructive algorithms
,
strings
1400
x12774
1421B
Putting Bricks in the Wall
constructive algorithms
,
implementation
1100
x13046
1421A
XORwice
bitmasks
,
greedy
,
math
800
x28792
1420E
Battle Lemmings
dp
,
greedy
2500
x926
1420D
Rescue Nibel!
combinatorics
,
data structures
,
sortings
1800
x7562
1420C2
Pokémon Army (hard version)
data structures
,
divide and conquer
,
dp
,
greedy
,
implementation
2100
x4672
1420C1
Pokémon Army (easy version)
constructive algorithms
,
dp
,
greedy
1300
x17560
1420B
Rock and Lever
bitmasks
,
math
1200
x25560
1420A
Cubes Sorting
math
,
sortings
900
x23339
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