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CodeTON Round 8 (Div. 1 + Div. 2, Rated, Prizes!)
29:10:07
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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
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
1621A
Stable Arrangement of Rooks
constructive algorithms
800
x23488
1620E
Replace the Numbers
constructive algorithms
,
data structures
,
dsu
,
implementation
1900
x7645
1620D
Exact Change
brute force
,
constructive algorithms
,
greedy
2000
x3952
1620A
Equal or Not Equal
constructive algorithms
,
dsu
,
implementation
800
x21095
1619F
Let's Play the Hat?
brute force
,
constructive algorithms
,
greedy
,
math
2000
x1974
1619E
MEX and Increments
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
sortings
1700
x8542
1618F
Reverse
bitmasks
,
constructive algorithms
,
dfs and similar
,
implementation
,
math
,
strings
2000
x3973
1618E
Singers' Tour
constructive algorithms
,
math
1700
x6879
1617D2
Too Many Impostors (hard version)
constructive algorithms
,
implementation
,
interactive
,
math
2400
x1687
1617D1
Too Many Impostors (easy version)
constructive algorithms
,
implementation
,
interactive
1800
x4492
1617B
GCD Problem
brute force
,
constructive algorithms
,
math
,
number theory
900
x22104
1617A
Forbidden Subsequence
constructive algorithms
,
greedy
,
sortings
,
strings
800
x16055
1615H
Reindeer Games
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
flows
,
graphs
,
shortest paths
3000
x304
1615G
Maximum Adjacent Pairs
constructive algorithms
,
graph matchings
3300
x145
1614C
Divan and bitwise operations
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
1500
x9841
1614B
Divan and a New Project
constructive algorithms
,
sortings
1000
x17572
1614A
Divan and a Store
brute force
,
constructive algorithms
,
greedy
800
x22978
1612G
Max Sum Array
combinatorics
,
constructive algorithms
,
greedy
,
sortings
2500
x808
1612B
Special Permutation
constructive algorithms
,
greedy
900
x16791
1612A
Distance
brute force
,
constructive algorithms
800
x17419
1611D
Weights Assignment For Tree Edges
constructive algorithms
,
trees
1500
x9406
1611C
Polycarp Recovers the Permutation
constructive algorithms
1000
x17797
1611B
Team Composition: Programmers and Mathematicians
binary search
,
constructive algorithms
,
math
800
x28181
1611A
Make Even
constructive algorithms
,
math
800
x30317
1610F
Mashtali: a Space Oddysey
constructive algorithms
,
dfs and similar
,
graphs
3000
x485
1608B
Build the Permutation
constructive algorithms
,
greedy
1200
x11356
1608A
Find Array
constructive algorithms
,
math
800
x18628
1606D
Red-Blue Matrix
brute force
,
constructive algorithms
,
implementation
,
sortings
2400
x1390
1605D
Treelabeling
bitmasks
,
constructive algorithms
,
dfs and similar
,
games
,
greedy
,
implementation
,
trees
2100
x2819
1603B
Moderate Modular Mode
constructive algorithms
,
math
,
number theory
1600
x12960
1603A
Di-visible Confusion
constructive algorithms
,
math
,
number theory
1300
x15994
1602B
Divine Array
constructive algorithms
,
implementation
1100
x13761
1599A
Weights
constructive algorithms
,
greedy
,
two pointers
2600
x628
1594F
Ideal Farm
constructive algorithms
,
math
2400
x1253
1594D
The Number of Imposters
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
graphs
1700
x7014
1593G
Changing Brackets
constructive algorithms
,
data structures
,
dp
,
greedy
2200
x1602
1592F2
Alice and Recoloring 2
constructive algorithms
,
flows
,
graph matchings
,
greedy
2800
x650
1592F1
Alice and Recoloring 1
constructive algorithms
,
greedy
2600
x753
1592C
Bakry and Partitioning
bitmasks
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x7476
1592B
Hemose Shopping
constructive algorithms
,
dsu
,
math
,
sortings
1200
x15491
1586I
Omkar and Mosaic
combinatorics
,
constructive algorithms
,
math
3500
x122
1583F
Defender of Childhood Dreams
bitmasks
,
constructive algorithms
,
divide and conquer
2500
x1207
1583E
Moment of Bloom
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
greedy
,
trees
2200
x2150
1583D
Omkar and the Meaning of Life
constructive algorithms
,
greedy
,
interactive
1800
x5197
1583B
Omkar and Heavenly Tree
constructive algorithms
,
trees
1200
x11871
1582D
Vupsen, Pupsen and 0
constructive algorithms
,
math
1600
x10017
1581B
Diameter of Graph
constructive algorithms
,
graphs
,
greedy
,
math
1200
x10959
1580E
Railway Construction
brute force
,
constructive algorithms
,
data structures
,
graphs
,
shortest paths
3400
x63
1579E1
Permutation Minimization by Deque
constructive algorithms
,
greedy
,
math
1000
x20682
1579D
Productive Meeting
constructive algorithms
,
graphs
,
greedy
1400
x15094
1578M
The Mind
constructive algorithms
,
interactive
,
probabilities
2700
x432
1578A
Anti-Tetris
constructive algorithms
,
graphs
,
shortest paths
2800
x323
1574E
Coloring
combinatorics
,
constructive algorithms
,
implementation
,
math
2500
x854
1574A
Regular Bracket Sequences
constructive algorithms
800
x21191
1572B
Xor of 3
brute force
,
constructive algorithms
,
greedy
,
two pointers
2500
x1727
1571F
Kotlinforces
*special problem
,
constructive algorithms
,
dp
2000
x175
1571D
Sweepstake
*special problem
,
brute force
,
constructive algorithms
,
implementation
,
math
1800
x313
1569B
Chess Tournament
constructive algorithms
1000
x18512
1567F
One-Four Overload
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
2700
x719
1567D
Expression Evaluation Error
constructive algorithms
,
greedy
,
implementation
,
math
2000
x4369
1566H
Xor-quiz
constructive algorithms
,
dp
,
interactive
,
math
,
number theory
3200
x104
1566G
Four Vertices
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
3100
x323
1566E
Buds Re-hanging
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x3985
1566C
MAX-MEX Cut
bitmasks
,
constructive algorithms
,
dp
,
greedy
1000
x16856
1566B
MIN-MEX Cut
bitmasks
,
constructive algorithms
,
dp
,
greedy
800
x18926
1562C
Rings
constructive algorithms
,
math
1500
x12829
1562B
Scenes From a Memory
brute force
,
constructive algorithms
,
implementation
,
math
,
number theory
1000
x19098
1560F2
Nearest Beautiful Number (hard version)
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
2100
x4166
1560F1
Nearest Beautiful Number (easy version)
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
1900
x5858
1559D2
Mocha and Diana (Hard Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
,
two pointers
2500
x2506
1559D1
Mocha and Diana (Easy Version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
1400
x13099
1559C
Mocha and Hiking
constructive algorithms
,
graphs
1200
x19514
1559A
Mocha and Math
bitmasks
,
constructive algorithms
,
math
900
x27815
1558C
Bottom-Tier Reversals
constructive algorithms
,
greedy
2000
x3119
1557E
Assiut Chess
brute force
,
constructive algorithms
,
interactive
2800
x684
1556D
Take a Guess
bitmasks
,
constructive algorithms
,
interactive
,
math
1800
x6386
1555D
Say No to Palindromes
brute force
,
constructive algorithms
,
dp
,
strings
1600
x11612
1555C
Coin Rows
brute force
,
constructive algorithms
,
dp
,
implementation
1300
x20654
1554D
Diane
constructive algorithms
,
greedy
,
strings
1800
x8994
1553G
Common Divisor Graph
brute force
,
constructive algorithms
,
dsu
,
graphs
,
hashing
,
math
,
number theory
2700
x966
1553E
Permutation Shift
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
math
2100
x3215
1552E
Colors and Intervals
constructive algorithms
,
data structures
,
greedy
,
sortings
2300
x1759
1552D
Array Differentiation
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
math
1800
x6635
1552C
Maximize the Intersections
combinatorics
,
constructive algorithms
,
geometry
,
greedy
,
sortings
1800
x5746
1551D2
Domino (hard version)
constructive algorithms
,
implementation
,
math
2100
x2632
1551D1
Domino (easy version)
constructive algorithms
,
math
1700
x6798
1551B2
Wonderful Coloring - 2
binary search
,
constructive algorithms
,
data structures
,
greedy
1400
x14919
1550D
Excellent Arrays
binary search
,
combinatorics
,
constructive algorithms
,
implementation
,
math
,
sortings
,
two pointers
2300
x1772
1547D
Co-growing Sequence
bitmasks
,
constructive algorithms
,
greedy
1300
x15854
1545D
AquaMoon and Wrong Coordinate
constructive algorithms
,
interactive
,
math
3000
x454
1545C
AquaMoon and Permutations
2-sat
,
brute force
,
combinatorics
,
constructive algorithms
,
graph matchings
,
graphs
2800
x575
1543E
The Final Pursuit
bitmasks
,
constructive algorithms
,
divide and conquer
,
graphs
,
greedy
,
math
2700
x391
1543D2
RPD and Rap Sheet (Hard Version)
brute force
,
constructive algorithms
,
interactive
,
math
2200
x1929
1543D1
RPD and Rap Sheet (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
1700
x7401
1542B
Plus and Multiply
constructive algorithms
,
math
,
number theory
1500
x21761
1541A
Pretty Permutations
constructive algorithms
,
greedy
,
implementation
800
x28850
1540A
Great Graphs
constructive algorithms
,
graphs
,
greedy
,
shortest paths
,
sortings
1400
x13606
1539E
Game with Cards
binary search
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
2500
x908
1538D
Another Problem About Dividing Numbers
constructive algorithms
,
math
,
number theory
1700
x12883
1537F
Figure Fixing
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
2200
x2344
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