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Codeforces Round 974 (Div. 3)
07:47:00
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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
1425I
Impressive Harvesting of The Orchard
data structures
2800
x237
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
1424M
Ancient Language
graphs
,
sortings
2200
x530
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
1421E
Swedish Heroes
brute force
,
dp
,
implementation
2700
x695
1421D
Hexagons
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
,
shortest paths
1900
x4152
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
1419F
Rain of Fire
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
2800
x491
1419E
Decryption
constructive algorithms
,
implementation
,
math
,
number theory
2100
x3258
1418G
Three Occurrences
data structures
,
divide and conquer
,
hashing
,
two pointers
2500
x1884
1418F
Equal Product
data structures
,
math
,
number theory
,
two pointers
3000
x368
1418E
Expected Damage
binary search
,
combinatorics
,
probabilities
2400
x1849
1418D
Trash Problem
data structures
,
implementation
2100
x4352
1416F
Showing Off
flows
,
graph matchings
,
greedy
,
implementation
3300
x462
1416E
Split
binary search
,
data structures
,
dp
,
greedy
3200
x289
1416D
Graph and Queries
data structures
,
dsu
,
graphs
,
implementation
,
trees
2600
x2046
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x4401
1416B
Make Them Equal
constructive algorithms
,
greedy
,
math
2000
x6111
1415F
Cakes for Clones
dp
2900
x484
1415E
New Game Plus!
constructive algorithms
,
greedy
,
math
2200
x2708
1415D
XOR-gun
bitmasks
,
brute force
,
constructive algorithms
2000
x5384
1413F
Roads and Ramen
data structures
,
trees
2800
x775
1413E
Solo mid Oracle
greedy
,
math
,
ternary search
2100
x2013
1413D
Shurikens
data structures
,
greedy
,
implementation
1700
x6484
1413C
Perform Easily
binary search
,
brute force
,
dp
,
implementation
,
sortings
,
two pointers
1900
x5708
1411G
No Game No Life
bitmasks
,
games
,
math
,
matrices
2700
x660
1411F
The Thorny Path
greedy
,
math
3000
x371
1411E
Poman Numbers
bitmasks
,
greedy
,
math
,
strings
2300
x1633
1411D
Grime Zoo
brute force
,
greedy
,
implementation
,
strings
2100
x2514
1411C
Peaceful Rooks
dfs and similar
,
dsu
,
graphs
1700
x7966
1409F
Subsequences of Length Two
dp
,
strings
2100
x4444
1409E
Two Platforms
binary search
,
dp
,
sortings
,
two pointers
1800
x7811
1408I
Bitwise Magic
dp
,
math
3200
x174
1408H
Rainbow Triples
binary search
,
data structures
,
flows
,
greedy
3300
x399
1408G
Clusterization Counting
combinatorics
,
dp
,
dsu
,
fft
,
graphs
,
trees
2700
x1032
1408F
Two Different
constructive algorithms
,
divide and conquer
2300
x2364
1408E
Avoid Rainbow Cycles
data structures
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1974
1408D
Searchlights
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
sortings
,
two pointers
2000
x4304
1407E
Egor in the Republic of Dagestan
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
2500
x1689
1407D
Discrete Centrifugal Jumps
data structures
,
dp
,
graphs
2200
x4801
1407C
Chocolate Bunny
constructive algorithms
,
interactive
,
math
,
two pointers
1600
x11967
1406E
Deleting Numbers
interactive
,
math
,
number theory
2600
x1614
1406D
Three Sequences
constructive algorithms
,
data structures
,
greedy
,
math
2200
x3488
1406C
Link Cut Centroids
constructive algorithms
,
dfs and similar
,
graphs
,
trees
1700
x10243
1404E
Bricks
flows
,
graph matchings
,
graphs
2800
x1232
1404D
Game of Pairs
constructive algorithms
,
dfs and similar
,
interactive
,
math
,
number theory
2800
x1074
1404C
Fixed Point Removal
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2300
x2656
1404B
Tree Tag
dfs and similar
,
dp
,
games
,
trees
1900
x7380
1403C
Chess Rush
*special problem
,
combinatorics
,
dp
,
implementation
,
math
3200
x51
1403B
Spring cleaning
*special problem
,
data structures
,
dfs and similar
,
graphs
,
trees
2300
x366
1403A
The Potion of Great Power
*special problem
,
2-sat
,
binary search
,
data structures
,
graphs
,
interactive
,
sortings
,
two pointers
2400
x290
1402C
Star Trek
*special problem
,
combinatorics
,
dfs and similar
,
dp
,
games
,
graphs
,
matrices
,
trees
2600
x203
1402B
Roads
*special problem
,
geometry
,
sortings
2900
x110
1402A
Fancy Fence
*special problem
,
data structures
,
dsu
,
implementation
,
math
,
sortings
1800
x1186
1401F
Reverse and Swap
binary search
,
bitmasks
,
data structures
2400
x1738
1401E
Divide Square
data structures
,
geometry
,
implementation
,
sortings
2400
x2416
1401D
Maximum Distributed Tree
dfs and similar
,
dp
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
trees
1800
x9290
1400G
Mercenaries
bitmasks
,
brute force
,
combinatorics
,
dp
,
dsu
,
math
,
two pointers
2600
x956
1400F
x-prime Substrings
brute force
,
dfs and similar
,
dp
,
string suffix structures
,
strings
2800
x887
1400E
Clear the Multiset
data structures
,
divide and conquer
,
dp
,
greedy
2200
x5420
1400D
Zigzags
brute force
,
combinatorics
,
data structures
,
math
,
two pointers
1900
x10235
1400B
RPG Protagonist
brute force
,
greedy
,
math
1700
x11171
1399F
Yet Another Segments Subset
data structures
,
dp
,
graphs
,
sortings
2300
x1605
1399E2
Weights Division (hard version)
binary search
,
dfs and similar
,
greedy
,
sortings
,
trees
,
two pointers
2200
x2270
1399E1
Weights Division (easy version)
data structures
,
dfs and similar
,
greedy
,
trees
2000
x5814
1398G
Running Competition
bitmasks
,
fft
,
math
,
number theory
2600
x1085
1398F
Controversial Rounds
binary search
,
data structures
,
dp
,
greedy
,
two pointers
2500
x1276
1398E
Two Types of Spells
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
2200
x2416
1398D
Colored Rectangles
dp
,
greedy
,
sortings
1800
x11456
1398C
Good Subarrays
data structures
,
dp
,
math
1600
x26209
1396E
Distance Matching
constructive algorithms
,
dfs and similar
,
trees
3200
x350
1396D
Rainbow Rectangles
data structures
,
sortings
,
two pointers
3300
x308
1396C
Monster Invaders
dp
,
greedy
,
implementation
2300
x2587
1396B
Stoned Game
brute force
,
constructive algorithms
,
games
,
greedy
1800
x11358
1396A
Multiples of Length
constructive algorithms
,
greedy
,
number theory
1600
x15413
1395C
Boboniu and Bit Operations
bitmasks
,
brute force
,
dp
,
greedy
1600
x14075
1394E
Boboniu and Banknote Collection
strings
3500
x146
1394D
Boboniu and Jianghu
dp
,
greedy
,
sortings
,
trees
2800
x1019
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