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Codeforces Round 987 (Div. 2)
10:44:40
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Difficulty:
—
greedy
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
1431G
Number Deletion Game
*special problem
,
dp
,
games
,
greedy
2100
x189
1431F
Neural Network Problem
*special problem
,
binary search
,
greedy
2100
x156
1431D
Used Markers
*special problem
,
greedy
1500
x457
1430F
Realistic Gameplay
dp
,
greedy
2600
x920
1430E
String Reversal
data structures
,
greedy
,
strings
1900
x6551
1430D
String Deletion
binary search
,
data structures
,
greedy
,
two pointers
1700
x8830
1430C
Numbers on Whiteboard
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
1000
x24833
1430B
Barrels
greedy
,
implementation
,
sortings
800
x19424
1428G2
Lucky Numbers (Hard Version)
dp
,
greedy
3000
x642
1428G1
Lucky Numbers (Easy Version)
dp
,
greedy
2900
x580
1428E
Carrots for Rabbits
binary search
,
data structures
,
greedy
,
math
,
sortings
2200
x3709
1428D
Bouncing Boomerangs
constructive algorithms
,
greedy
,
implementation
1900
x4514
1428C
ABBB
brute force
,
data structures
,
greedy
,
strings
1100
x20332
1427F
Boring Card Game
data structures
,
greedy
,
trees
3200
x317
1427B
Chess Cheater
greedy
,
implementation
,
sortings
1400
x10954
1426E
Rock, Paper, Scissors
brute force
,
constructive algorithms
,
flows
,
greedy
,
math
1800
x7477
1426D
Non-zero Segments
constructive algorithms
,
data structures
,
greedy
,
sortings
1500
x16097
1425E
Excitation of Atoms
greedy
,
implementation
2200
x968
1425A
Arena of Greed
games
,
greedy
1400
x6608
1422E
Minlexes
dp
,
greedy
,
implementation
,
strings
2700
x751
1422B
Nice Matrix
greedy
,
implementation
,
math
1300
x14442
1421D
Hexagons
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
,
shortest paths
1900
x4178
1421A
XORwice
bitmasks
,
greedy
,
math
800
x29365
1420E
Battle Lemmings
dp
,
greedy
2500
x936
1420C2
Pokémon Army (hard version)
data structures
,
divide and conquer
,
dp
,
greedy
,
implementation
2100
x4720
1420C1
Pokémon Army (easy version)
constructive algorithms
,
dp
,
greedy
1300
x17689
1419D2
Sage's Birthday (hard version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x15697
1419D1
Sage's Birthday (easy version)
binary search
,
constructive algorithms
,
greedy
,
sortings
1000
x24516
1419C
Killjoy
greedy
,
implementation
,
math
1500
x15464
1419B
Stairs
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
1200
x16313
1419A
Digit Game
games
,
greedy
,
implementation
900
x19606
1418C
Mortal Kombat Tower
dp
,
graphs
,
greedy
,
shortest paths
1500
x20339
1418B
Negative Prefixes
greedy
,
sortings
1300
x16707
1417B
Two Arrays
greedy
,
math
,
sortings
1100
x14477
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
x344
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
x6163
1415E
New Game Plus!
constructive algorithms
,
greedy
,
math
2200
x2741
1415B
Repainting Street
brute force
,
brute force
,
greedy
1100
x12205
1413E
Solo mid Oracle
greedy
,
math
,
ternary search
2100
x2038
1413D
Shurikens
data structures
,
greedy
,
implementation
1700
x6528
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
1409D
Decrease the Sum of Digits
greedy
,
math
1500
x19532
1409B
Minimum Product
brute force
,
greedy
,
math
1100
x29115
1409A
Yet Another Two Integers Problem
greedy
,
math
800
x67207
1408H
Rainbow Triples
binary search
,
data structures
,
flows
,
greedy
3300
x410
1408E
Avoid Rainbow Cycles
data structures
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x2007
1408B
Arrays Sum
constructive algorithms
,
greedy
,
math
1400
x9992
1407E
Egor in the Republic of Dagestan
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
2500
x1712
1407B
Big Vova
brute force
,
greedy
,
math
,
number theory
1300
x17081
1406D
Three Sequences
constructive algorithms
,
data structures
,
greedy
,
math
2200
x3527
1406B
Maximum Product
brute force
,
dp
,
greedy
,
implementation
,
sortings
1200
x22757
1406A
Subset Mex
greedy
,
implementation
,
math
900
x21555
1404C
Fixed Point Removal
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2300
x2693
1401D
Maximum Distributed Tree
dfs and similar
,
dp
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
trees
1800
x9378
1401B
Ternary Sequence
constructive algorithms
,
greedy
,
math
1100
x21146
1400E
Clear the Multiset
data structures
,
divide and conquer
,
dp
,
greedy
2200
x5519
1400C
Binary String Reconstruction
2-sat
,
brute force
,
constructive algorithms
,
greedy
1500
x17397
1400B
RPG Protagonist
brute force
,
greedy
,
math
1700
x11234
1399E2
Weights Division (hard version)
binary search
,
dfs and similar
,
greedy
,
sortings
,
trees
,
two pointers
2200
x2288
1399E1
Weights Division (easy version)
data structures
,
dfs and similar
,
greedy
,
trees
2000
x5861
1399D
Binary String To Subsequences
constructive algorithms
,
data structures
,
greedy
,
implementation
1500
x18373
1399C
Boats Competition
brute force
,
greedy
,
two pointers
1200
x29310
1399B
Gifts Fixing
greedy
800
x43746
1399A
Remove Smallest
greedy
,
sortings
800
x67399
1398F
Controversial Rounds
binary search
,
data structures
,
dp
,
greedy
,
two pointers
2500
x1292
1398E
Two Types of Spells
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
2200
x2434
1398D
Colored Rectangles
dp
,
greedy
,
sortings
1800
x11548
1398B
Substring Removal Game
games
,
greedy
,
sortings
800
x24725
1397A
Juggling Letters
greedy
,
strings
800
x28714
1396C
Monster Invaders
dp
,
greedy
,
implementation
2300
x2608
1396B
Stoned Game
brute force
,
constructive algorithms
,
games
,
greedy
1800
x11479
1396A
Multiples of Length
constructive algorithms
,
greedy
,
number theory
1600
x15530
1395C
Boboniu and Bit Operations
bitmasks
,
brute force
,
dp
,
greedy
1600
x14197
1394D
Boboniu and Jianghu
dp
,
greedy
,
sortings
,
trees
2800
x1031
1394A
Boboniu Chats with Du
dp
,
greedy
,
sortings
,
two pointers
1800
x6801
1393C
Pinkie Pie Eats Patty-cakes
constructive algorithms
,
greedy
,
math
,
sortings
1700
x10652
1393B
Applejack and Storages
constructive algorithms
,
data structures
,
greedy
,
implementation
1400
x16760
1393A
Rainbow Dash, Fluttershy and Chess Coloring
greedy
,
math
800
x20540
1392F
Omkar and Landslide
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
2400
x2183
1392D
Omkar and Bed Wars
dp
,
greedy
1700
x8981
1392C
Omkar and Waterslide
greedy
,
implementation
1200
x18859
1392A
Omkar and Password
greedy
,
math
800
x20788
1391E
Pairs of Pairs
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2600
x1717
1391D
505
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
implementation
2000
x5326
1391B
Fix You
brute force
,
greedy
,
implementation
800
x27447
1389D
Segment Intersections
brute force
,
greedy
,
implementation
,
math
2100
x4341
1389C
Good String
brute force
,
dp
,
greedy
,
two pointers
1500
x19110
1389B
Array Walk
brute force
,
dp
,
greedy
1600
x16904
1389A
LCM Problem
constructive algorithms
,
greedy
,
math
,
number theory
800
x41869
1388D
Captain Flint and Treasure
data structures
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2000
x6463
1388C
Uncle Bogdan and Country Happiness
dfs and similar
,
greedy
,
math
,
trees
1800
x9761
1388B
Captain Flint and a Long Voyage
greedy
,
math
1000
x22328
1388A
Captain Flint and Crew Recruitment
brute force
,
greedy
,
math
,
number theory
800
x24980
1387B1
Village (Minimum)
*special problem
,
dp
,
greedy
,
trees
2100
x1484
1385F
Removing Leaves
data structures
,
greedy
,
implementation
,
trees
2300
x2574
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