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Codeforces Round 968 (Div. 2)
05:30:06
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Difficulty:
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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
#
Name
1520A
Do Not Be Distracted!
brute force
,
implementation
800
x51180
1519D
Maximum Sum of Products
brute force
,
dp
,
implementation
,
math
,
two pointers
1600
x15051
1517E
Group Photo
binary search
,
data structures
,
implementation
,
two pointers
2500
x964
1517C
Fillomino 2
constructive algorithms
,
dfs and similar
,
greedy
,
implementation
1400
x13302
1514D
Cut and Stick
binary search
,
data structures
,
greedy
,
implementation
,
sortings
2000
x4266
1513A
Array and Peaks
constructive algorithms
,
implementation
800
x19325
1512F
Education
brute force
,
dp
,
greedy
,
implementation
1900
x6155
1512C
A-B Palindrome
constructive algorithms
,
implementation
,
strings
1200
x19967
1512B
Almost Rectangle
implementation
800
x25283
1512A
Spy Detected!
brute force
,
implementation
800
x62785
1511C
Yet Another Card Deck
brute force
,
data structures
,
implementation
,
trees
1100
x23314
1510K
King's Task
brute force
,
graphs
,
implementation
1200
x5404
1508B
Almost Sorted
binary search
,
combinatorics
,
constructive algorithms
,
implementation
1800
x3952
1508A
Binary Literature
constructive algorithms
,
greedy
,
implementation
,
strings
,
two pointers
1900
x6176
1506E
Restoring the Permutation
constructive algorithms
,
implementation
1500
x12983
1506C
Double-ended Strings
brute force
,
implementation
,
strings
1000
x24603
1506B
Partial Replacement
greedy
,
implementation
1100
x20164
1505G
Encoded message
*special problem
,
implementation
2600
x300
1505E
Cakewalk
*special problem
,
greedy
,
implementation
,
shortest paths
1800
x1791
1505C
Fibonacci Words
*special problem
,
implementation
1400
x6397
1505B
DMCA
*special problem
,
implementation
,
number theory
1600
x6124
1505A
Is it rated - 2
*special problem
,
implementation
,
interactive
900
x14335
1504B
Flip the Bits
constructive algorithms
,
greedy
,
implementation
,
math
1200
x18207
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x178
1501B
Napoleon Cake
dp
,
implementation
,
sortings
900
x18933
1501A
Alexey and Train
implementation
800
x11556
1500A
Going Home
brute force
,
hashing
,
implementation
,
math
1800
x8767
1499B
Binary Removals
brute force
,
dp
,
greedy
,
implementation
1000
x20632
1498D
Bananas in a Microwave
dfs and similar
,
dp
,
graphs
,
implementation
2200
x2311
1495E
Qingshan and Daniel
brute force
,
data structures
,
greedy
,
implementation
3200
x414
1494F
Delete The Edges
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
2900
x337
1494C
1D Sokoban
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1900
x5383
1494B
Berland Crossword
bitmasks
,
brute force
,
greedy
,
implementation
1400
x14250
1494A
ABC String
bitmasks
,
brute force
,
implementation
900
x20750
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x4933
1493B
Planet Lapituletti
brute force
,
implementation
1300
x11810
1492E
Almost Fault-Tolerant Database
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
,
implementation
2500
x1175
1491C
Pekora and Trampoline
brute force
,
data structures
,
dp
,
greedy
,
implementation
1700
x7870
1491A
K-th Largest Value
brute force
,
greedy
,
implementation
800
x18193
1490D
Permutation Transformation
dfs and similar
,
divide and conquer
,
implementation
1200
x19256
1487E
Cheap Dinner
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
sortings
,
two pointers
2000
x4502
1487C
Minimum Ties
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
math
1500
x14051
1487A
Arena
implementation
,
sortings
800
x26433
1486A
Shifting Stacks
greedy
,
implementation
900
x25202
1485B
Replace and Keep Sorted
dp
,
implementation
,
math
1200
x16989
1482D
Playlist
data structures
,
dsu
,
implementation
,
shortest paths
1900
x3828
1482C
Basic Diplomacy
brute force
,
constructive algorithms
,
greedy
,
implementation
1600
x9336
1482B
Restore Modulo
implementation
,
math
1500
x9143
1481D
AB Graph
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2000
x4505
1481B
New Colony
brute force
,
greedy
,
implementation
1100
x19215
1480B
The Great Hero
greedy
,
implementation
,
sortings
900
x17094
1479B2
Painting the Array II
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
2100
x4013
1479B1
Painting the Array I
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
1900
x6921
1478C
Nezzar and Symmetric Array
implementation
,
math
,
sortings
1700
x9695
1476D
Journey
dfs and similar
,
dp
,
dsu
,
implementation
1700
x8554
1474C
Array Destruction
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
1700
x12557
1473D
Program
data structures
,
dp
,
implementation
,
strings
1700
x9560
1473A
Replacing Elements
greedy
,
implementation
,
math
,
sortings
800
x33461
1471B
Strange List
brute force
,
greedy
,
implementation
,
math
1100
x19273
1470E
Strange Permutation
binary search
,
combinatorics
,
data structures
,
dp
,
graphs
,
implementation
,
two pointers
3200
x297
1469C
Building a Fence
dp
,
greedy
,
implementation
,
two pointers
1600
x10684
1468N
Waste Sorting
greedy
,
implementation
900
x8104
1468M
Similar Sets
data structures
,
graphs
,
implementation
2300
x938
1468K
The Robot
brute force
,
implementation
1600
x5074
1468I
Plane Tiling
geometry
,
implementation
,
math
2500
x494
1468C
Berpizza
data structures
,
implementation
1400
x7717
1467B
Hills And Valleys
brute force
,
implementation
1700
x10895
1463E
Plan of Lectures
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2400
x1493
1463C
Busy Robot
implementation
1800
x5613
1462E2
Close Tuples (hard version)
binary search
,
combinatorics
,
implementation
,
math
,
sortings
,
two pointers
1700
x9598
1462B
Last Year's Substring
dp
,
implementation
,
strings
800
x27002
1462A
Favorite Sequence
implementation
,
two pointers
800
x41247
1461E
Water Level
brute force
,
graphs
,
greedy
,
implementation
,
math
2200
x2095
1461D
Divide and Summarize
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
,
sortings
1600
x9186
1461B
Find the Spruce
brute force
,
dp
,
implementation
1400
x12570
1455E
Four Points
brute force
,
constructive algorithms
,
flows
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
2400
x1507
1454C
Sequence Transformation
greedy
,
implementation
1200
x21340
1454B
Unique Bid Auction
implementation
800
x27996
1453C
Triangles
greedy
,
implementation
1700
x6022
1453B
Suffix Operations
constructive algorithms
,
implementation
1400
x13298
1453A
Cancel the Trains
implementation
800
x22485
1451C
String Equality
dp
,
greedy
,
hashing
,
implementation
,
strings
1400
x15430
1451B
Non-Substring Subsequence
dp
,
greedy
,
implementation
,
strings
900
x19197
1450H2
Multithreading (Hard Version)
combinatorics
,
implementation
,
math
3300
x215
1450D
Rating Compression
binary search
,
data structures
,
greedy
,
implementation
,
two pointers
1800
x5444
1442B
Identify the Operations
combinatorics
,
data structures
,
dsu
,
greedy
,
implementation
1800
x4456
1440A
Buy the String
implementation
,
math
800
x19681
1439C
Greedy Shopping
binary search
,
data structures
,
divide and conquer
,
greedy
,
implementation
2600
x1753
1439A2
Binary Table (Hard Version)
constructive algorithms
,
graphs
,
greedy
,
implementation
1900
x5088
1439A1
Binary Table (Easy Version)
constructive algorithms
,
implementation
1500
x9329
1438A
Specific Tastes of Andre
constructive algorithms
,
implementation
800
x19216
1437E
Make It Increasing
binary search
,
constructive algorithms
,
data structures
,
dp
,
implementation
2200
x3410
1433B
Yet Another Bookshelf
greedy
,
implementation
800
x28313
1433A
Boring Apartments
implementation
,
math
800
x51582
1431C
Black Friday
*special problem
,
implementation
1600
x702
1431B
Polycarp and the Language of Gods
*special problem
,
implementation
,
two pointers
1400
x1007
1430C
Numbers on Whiteboard
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
1000
x24204
1430B
Barrels
greedy
,
implementation
,
sortings
800
x19333
1428D
Bouncing Boomerangs
constructive algorithms
,
greedy
,
implementation
1900
x4457
1428B
Belted Rooms
graphs
,
implementation
1200
x14291
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