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Before contest
Codeforces Round 1101 (Div. 2)
01:48:33
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Difficulty:
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constructive algorithms
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
communication
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
1504A
Déjà Vu
constructive algorithms
,
strings
800
x22835
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x230
1503D
Flip the Cards
2-sat
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
2600
x1266
1503B
3-Coloring
constructive algorithms
,
games
,
interactive
1700
x7696
1503A
Balance the Bits
constructive algorithms
,
greedy
1600
x14749
1500C
Matrix Sorting
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
two pointers
2600
x917
1499A
Domino on Windowsill
combinatorics
,
constructive algorithms
,
math
800
x21978
1497C2
k-LCM (hard version)
constructive algorithms
,
math
1600
x19559
1497C1
k-LCM (easy version)
constructive algorithms
,
math
1200
x29331
1497B
M-arrays
constructive algorithms
,
greedy
,
math
1200
x27724
1496A
Split it!
brute force
,
constructive algorithms
,
greedy
,
strings
900
x22280
1495F
Squares
constructive algorithms
,
data structures
,
dp
,
graphs
,
trees
3300
x423
1495C
Garden of the Sun
constructive algorithms
,
graphs
2300
x2909
1494F
Delete The Edges
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
2900
x497
1494E
A-Z Graph
constructive algorithms
,
data structures
,
graphs
,
hashing
2400
x2065
1494D
Dogeforces
constructive algorithms
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
sortings
,
trees
2300
x2825
1493E
Enormous XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
,
strings
,
two pointers
2600
x1091
1493C
K-beautiful Strings
binary search
,
brute force
,
constructive algorithms
,
greedy
,
strings
2000
x4961
1493A
Anti-knapsack
constructive algorithms
,
greedy
800
x19779
1492E
Almost Fault-Tolerant Database
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
,
implementation
2500
x1292
1492D
Genius's Gambit
bitmasks
,
constructive algorithms
,
greedy
,
math
1900
x6522
1491G
Switch and Flip
constructive algorithms
,
graphs
,
math
2800
x1015
1491F
Magnets
binary search
,
constructive algorithms
,
interactive
2700
x1133
1491D
Zookeeper and The Infinite Zoo
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
1800
x8333
1490B
Balanced Remainders
brute force
,
constructive algorithms
,
math
1000
x27941
1487C
Minimum Ties
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
math
1500
x15435
1486E
Paired Payment
binary search
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graphs
,
shortest paths
2200
x3377
1485D
Multiples and Power Differences
constructive algorithms
,
graphs
,
math
,
number theory
2200
x5665
1482C
Basic Diplomacy
brute force
,
constructive algorithms
,
greedy
,
implementation
1600
x10044
1481D
AB Graph
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2000
x4885
1481C
Fence Painting
brute force
,
constructive algorithms
,
greedy
1600
x12430
1479C
Continuous City
bitmasks
,
constructive algorithms
2500
x1446
1479B2
Painting the Array II
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
2100
x4439
1479B1
Painting the Array I
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
1900
x7476
1477D
Nezzar and Hidden Permutations
constructive algorithms
,
dfs and similar
,
graphs
2800
x791
1477C
Nezzar and Nice Beatmap
constructive algorithms
,
geometry
,
greedy
,
math
,
sortings
2200
x2593
1477A
Nezzar and Board
constructive algorithms
,
math
,
number theory
1800
x6548
1476A
K-divisible Sum
binary search
,
constructive algorithms
,
greedy
,
math
1000
x45104
1475F
Unusual Matrix
2-sat
,
brute force
,
constructive algorithms
1900
x5920
1474E
What Is It?
constructive algorithms
,
greedy
2500
x1465
1474C
Array Destruction
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
1700
x14208
1474B
Different Divisors
binary search
,
constructive algorithms
,
greedy
,
math
,
number theory
1000
x40900
1473C
No More Inversions
constructive algorithms
,
math
1500
x13448
1470D
Strange Housing
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
greedy
2200
x4196
1470C
Strange Shuffle
binary search
,
brute force
,
constructive algorithms
,
interactive
2500
x1440
1469D
Ceil Divisions
brute force
,
constructive algorithms
,
math
,
number theory
1700
x10226
1469A
Regular Bracket Sequence
constructive algorithms
,
greedy
1000
x30086
1468H
K and Medians
constructive algorithms
,
greedy
,
math
2200
x2000
1467C
Three Bags
constructive algorithms
,
greedy
1900
x6797
1467A
Wizard of Orz
constructive algorithms
,
greedy
,
math
900
x25333
1463E
Plan of Lectures
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2400
x1736
1463D
Pairs
binary search
,
constructive algorithms
,
greedy
,
two pointers
1900
x4849
1463B
Find The Array
bitmasks
,
constructive algorithms
,
greedy
1400
x21203
1461F
Mathematical Expression
constructive algorithms
,
dp
,
greedy
2700
x609
1461A
String Generation
constructive algorithms
,
greedy
800
x19004
1455E
Four Points
brute force
,
constructive algorithms
,
flows
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
2400
x1652
1455C
Ping-pong
constructive algorithms
,
games
,
math
1100
x20470
1455B
Jumps
constructive algorithms
,
math
1200
x23306
1454D
Number into Sequence
constructive algorithms
,
math
,
number theory
1300
x22359
1454A
Special Permutation
constructive algorithms
,
probabilities
800
x44185
1453D
Checkpoints
brute force
,
constructive algorithms
,
greedy
,
math
,
probabilities
1900
x4451
1453B
Suffix Operations
constructive algorithms
,
implementation
1400
x14091
1452F
Divide Powers
constructive algorithms
,
greedy
2900
x369
1451F
Nullify The Matrix
constructive algorithms
,
games
2700
x1223
1451E2
Bitwise Queries (Hard Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2300
x3387
1451E1
Bitwise Queries (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2000
x4936
1450F
The Struggling Contestant
constructive algorithms
,
greedy
2400
x1469
1450E
Capitalism
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2700
x1452
1450C2
Errich-Tac-Toe (Hard Version)
constructive algorithms
,
math
2300
x4204
1450C1
Errich-Tac-Toe (Easy Version)
constructive algorithms
,
math
2100
x5942
1450A
Avoid Trygub
constructive algorithms
,
sortings
800
x18500
1447A
Add Candies
constructive algorithms
,
math
800
x14460
1446E
Long Recovery
constructive algorithms
,
dfs and similar
3500
x123
1446A
Knapsack
constructive algorithms
,
greedy
,
sortings
1300
x17791
1444D
Rectangular Polyline
constructive algorithms
,
dp
,
geometry
2900
x646
1443A
Kids Seating
constructive algorithms
,
math
800
x16687
1442E
Black, White and Grey Tree
binary search
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
3000
x801
1442A
Extreme Subtraction
constructive algorithms
,
dp
,
greedy
1800
x9747
1439B
Graph Subset Problem
constructive algorithms
,
data structures
,
graphs
2600
x1655
1439A2
Binary Table (Hard Version)
constructive algorithms
,
graphs
,
greedy
,
implementation
1900
x5405
1439A1
Binary Table (Easy Version)
constructive algorithms
,
implementation
1500
x9817
1438E
Yurii Can Do Everything
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
two pointers
2500
x1470
1438D
Powerful Ksenia
bitmasks
,
constructive algorithms
,
math
2200
x4555
1438C
Engineer Artem
2-sat
,
chinese remainder theorem
,
constructive algorithms
,
fft
,
flows
2000
x11670
1438B
Valerii Against Everyone
constructive algorithms
,
data structures
,
greedy
,
sortings
1000
x29553
1438A
Specific Tastes of Andre
constructive algorithms
,
implementation
800
x19763
1437E
Make It Increasing
binary search
,
constructive algorithms
,
data structures
,
dp
,
implementation
2200
x3957
1437B
Reverse Binary Strings
constructive algorithms
,
greedy
1200
x20937
1437A
Marketing Scheme
brute force
,
constructive algorithms
,
greedy
,
math
800
x18484
1436B
Prime Square
constructive algorithms
,
math
900
x21744
1433D
Districts Connection
constructive algorithms
,
dfs and similar
1200
x30957
1433C
Dominant Piranha
constructive algorithms
,
greedy
900
x28699
1430C
Numbers on Whiteboard
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
1000
x28400
1430A
Number of Apartments
brute force
,
constructive algorithms
,
math
900
x21850
1428D
Bouncing Boomerangs
constructive algorithms
,
greedy
,
implementation
1900
x4743
1427E
Xum
bitmasks
,
constructive algorithms
,
math
,
matrices
,
number theory
2500
x1659
1427D
Unshuffling a Deck
constructive algorithms
,
implementation
2000
x3708
1426E
Rock, Paper, Scissors
brute force
,
constructive algorithms
,
flows
,
greedy
,
math
1800
x8155
1426D
Non-zero Segments
constructive algorithms
,
data structures
,
greedy
,
sortings
1500
x17642
1426C
Increase and Copy
binary search
,
constructive algorithms
,
math
1100
x20600
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