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Codeforces Round 953 (Div. 2)
2 days
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*has extra registration
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Difficulty:
—
implementation
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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Problems
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Status
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Custom test
Problems
#
Name
1482C
Basic Diplomacy
brute force
,
constructive algorithms
,
greedy
,
implementation
1600
x9127
1482B
Restore Modulo
implementation
,
math
1500
x9075
1481D
AB Graph
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2000
x4416
1481B
New Colony
brute force
,
greedy
,
implementation
1100
x19072
1480B
The Great Hero
greedy
,
implementation
,
sortings
900
x16966
1479B2
Painting the Array II
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
2100
x3942
1479B1
Painting the Array I
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
1900
x6785
1478C
Nezzar and Symmetric Array
implementation
,
math
,
sortings
1700
x9540
1476D
Journey
dfs and similar
,
dp
,
dsu
,
implementation
1700
x8432
1474C
Array Destruction
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
1700
x12276
1473D
Program
data structures
,
dp
,
implementation
,
strings
1700
x9373
1473A
Replacing Elements
greedy
,
implementation
,
math
,
sortings
800
x32988
1471B
Strange List
brute force
,
greedy
,
implementation
,
math
1100
x19162
1470E
Strange Permutation
binary search
,
combinatorics
,
data structures
,
dp
,
graphs
,
implementation
,
two pointers
3200
x294
1469C
Building a Fence
dp
,
greedy
,
implementation
,
two pointers
1600
x10536
1468N
Waste Sorting
greedy
,
implementation
900
x7939
1468M
Similar Sets
data structures
,
graphs
,
implementation
2300
x913
1468K
The Robot
brute force
,
implementation
1600
x4983
1468I
Plane Tiling
geometry
,
implementation
,
math
2500
x475
1468C
Berpizza
data structures
,
implementation
1400
x7503
1467B
Hills And Valleys
brute force
,
implementation
1700
x10759
1463E
Plan of Lectures
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2400
x1464
1463C
Busy Robot
implementation
1800
x5520
1462E2
Close Tuples (hard version)
binary search
,
combinatorics
,
implementation
,
math
,
sortings
,
two pointers
1700
x9299
1462B
Last Year's Substring
dp
,
implementation
,
strings
800
x26709
1462A
Favorite Sequence
implementation
,
two pointers
800
x40320
1461E
Water Level
brute force
,
graphs
,
greedy
,
implementation
,
math
2200
x2064
1461D
Divide and Summarize
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
,
sortings
1600
x9027
1461B
Find the Spruce
brute force
,
dp
,
implementation
1400
x12405
1455E
Four Points
brute force
,
constructive algorithms
,
flows
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
2400
x1442
1454C
Sequence Transformation
greedy
,
implementation
1200
x21071
1454B
Unique Bid Auction
implementation
800
x27664
1453C
Triangles
greedy
,
implementation
1700
x5992
1453B
Suffix Operations
constructive algorithms
,
implementation
1400
x13191
1453A
Cancel the Trains
implementation
800
x22314
1451C
String Equality
dp
,
greedy
,
hashing
,
implementation
,
strings
1400
x15270
1451B
Non-Substring Subsequence
dp
,
greedy
,
implementation
,
strings
900
x19054
1450H2
Multithreading (Hard Version)
combinatorics
,
implementation
,
math
3300
x170
1450D
Rating Compression
binary search
,
data structures
,
greedy
,
implementation
,
two pointers
1800
x5337
1442B
Identify the Operations
combinatorics
,
data structures
,
dsu
,
greedy
,
implementation
1800
x4332
1440A
Buy the String
implementation
,
math
800
x19547
1439C
Greedy Shopping
binary search
,
data structures
,
divide and conquer
,
greedy
,
implementation
2600
x1687
1439A2
Binary Table (Hard Version)
constructive algorithms
,
graphs
,
greedy
,
implementation
1900
x4967
1439A1
Binary Table (Easy Version)
constructive algorithms
,
implementation
1500
x9203
1438A
Specific Tastes of Andre
constructive algorithms
,
implementation
800
x19139
1437E
Make It Increasing
binary search
,
constructive algorithms
,
data structures
,
dp
,
implementation
2200
x3344
1433B
Yet Another Bookshelf
greedy
,
implementation
800
x28064
1433A
Boring Apartments
implementation
,
math
800
x49978
1431C
Black Friday
*special problem
,
implementation
1600
x699
1431B
Polycarp and the Language of Gods
*special problem
,
implementation
,
two pointers
1400
x1002
1430C
Numbers on Whiteboard
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
1000
x23585
1430B
Barrels
greedy
,
implementation
,
sortings
800
x19189
1428D
Bouncing Boomerangs
constructive algorithms
,
greedy
,
implementation
1900
x4430
1428B
Belted Rooms
graphs
,
implementation
1200
x14217
1427D
Unshuffling a Deck
constructive algorithms
,
implementation
2000
x3392
1427B
Chess Cheater
greedy
,
implementation
,
sortings
1400
x10740
1426B
Symmetric Matrix
implementation
900
x20413
1426A
Floor Number
implementation
,
math
800
x46108
1425E
Excitation of Atoms
greedy
,
implementation
2200
x910
1422E
Minlexes
dp
,
greedy
,
implementation
,
strings
2700
x734
1422B
Nice Matrix
greedy
,
implementation
,
math
1300
x14203
1421E
Swedish Heroes
brute force
,
dp
,
implementation
2700
x681
1421D
Hexagons
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
,
shortest paths
1900
x4062
1421B
Putting Bricks in the Wall
constructive algorithms
,
implementation
1100
x12905
1420C2
Pokémon Army (hard version)
data structures
,
divide and conquer
,
dp
,
greedy
,
implementation
2100
x4538
1419F
Rain of Fire
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
2800
x477
1419E
Decryption
constructive algorithms
,
implementation
,
math
,
number theory
2100
x3155
1419C
Killjoy
greedy
,
implementation
,
math
1500
x15034
1419B
Stairs
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
1200
x15994
1419A
Digit Game
games
,
greedy
,
implementation
900
x19321
1418D
Trash Problem
data structures
,
implementation
2100
x4204
1416F
Showing Off
flows
,
graph matchings
,
greedy
,
implementation
3300
x388
1416D
Graph and Queries
data structures
,
dsu
,
graphs
,
implementation
,
trees
2600
x1897
1416A
k-Amazing Numbers
binary search
,
data structures
,
implementation
,
two pointers
1500
x11910
1415C
Bouncing Ball
brute force
,
dp
,
implementation
1400
x10696
1413D
Shurikens
data structures
,
greedy
,
implementation
1700
x6373
1413C
Perform Easily
binary search
,
brute force
,
dp
,
implementation
,
sortings
,
two pointers
1900
x5574
1413B
A New Technique
implementation
1100
x11639
1411D
Grime Zoo
brute force
,
greedy
,
implementation
,
strings
2100
x2439
1411A
In-game Chat
implementation
800
x20172
1408D
Searchlights
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
sortings
,
two pointers
2000
x4180
1408C
Discrete Acceleration
binary search
,
dp
,
implementation
,
math
,
two pointers
1500
x8681
1406B
Maximum Product
brute force
,
dp
,
greedy
,
implementation
,
sortings
1200
x22157
1406A
Subset Mex
greedy
,
implementation
,
math
900
x21013
1405B
Array Cancellation
constructive algorithms
,
implementation
1000
x21111
1404A
Balanced Bitstring
implementation
,
strings
1500
x14915
1403C
Chess Rush
*special problem
,
combinatorics
,
dp
,
implementation
,
math
3200
x44
1402A
Fancy Fence
*special problem
,
data structures
,
dsu
,
implementation
,
math
,
sortings
1800
x1151
1401E
Divide Square
data structures
,
geometry
,
implementation
,
sortings
2400
x2176
1401D
Maximum Distributed Tree
dfs and similar
,
dp
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
trees
1800
x8905
1399D
Binary String To Subsequences
constructive algorithms
,
data structures
,
greedy
,
implementation
1500
x17789
1398E
Two Types of Spells
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
2200
x2183
1396C
Monster Invaders
dp
,
greedy
,
implementation
2300
x2402
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x353
1393E1
Twilight and Ancient Scroll (easier version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x375
1393D
Rarity and New Dress
dfs and similar
,
dp
,
implementation
,
shortest paths
2100
x3783
1393B
Applejack and Storages
constructive algorithms
,
data structures
,
greedy
,
implementation
1400
x16326
1392C
Omkar and Waterslide
greedy
,
implementation
1200
x18364
1392B
Omkar and Infinity Clock
implementation
,
math
800
x18411
1391D
505
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
implementation
2000
x4962
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