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CodeTON Round 8 (Div. 1 + Div. 2, Rated, Prizes!)
28:51:41
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Difficulty:
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dp
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
1584F
Strange LCS
bitmasks
,
dp
,
graphs
,
greedy
,
strings
2600
x827
1583C
Omkar and Determination
data structures
,
dp
1700
x6762
1582F2
Korney Korneevich and XOR (hard version)
binary search
,
brute force
,
dp
,
greedy
,
two pointers
2400
x1691
1582F1
Korney Korneevich and XOR (easy version)
bitmasks
,
dp
,
greedy
1800
x5156
1582E
Pchelyonok and Segments
binary search
,
data structures
,
dp
,
greedy
,
math
2000
x3550
1580D
Subsequence
brute force
,
divide and conquer
,
dp
,
greedy
,
trees
2900
x745
1580B
Mathematics Curriculum
brute force
,
combinatorics
,
dp
,
trees
2600
x957
1580A
Portal
brute force
,
data structures
,
dp
,
greedy
,
implementation
1700
x3519
1579G
Minimal Coverage
dp
2200
x2230
1575L
Longest Array Deconstruction
data structures
,
divide and conquer
,
dp
,
sortings
2100
x1211
1575H
Holiday Wall Ornaments
dp
,
strings
2200
x564
1575D
Divisible by Twenty-Five
brute force
,
dfs and similar
,
dp
1800
x2367
1574F
Occurrences
combinatorics
,
dfs and similar
,
dp
,
dsu
,
fft
,
graphs
2700
x566
1572E
Polygon
binary search
,
dp
,
geometry
3000
x263
1572C
Paint
dp
,
greedy
2700
x1378
1572A
Book
binary search
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
1800
x8448
1571G
A Battle Against a Dragon
*special problem
,
data structures
,
dp
2500
x71
1571F
Kotlinforces
*special problem
,
constructive algorithms
,
dp
2000
x175
1571E
Fix the String
*special problem
,
bitmasks
,
dp
,
greedy
1700
x318
1569F
Palindromic Hamiltonian Path
brute force
,
dfs and similar
,
dp
,
graphs
,
hashing
3000
x224
1567C
Carrying Conundrum
bitmasks
,
combinatorics
,
dp
,
math
1600
x11751
1566H
Xor-quiz
constructive algorithms
,
dp
,
interactive
,
math
,
number theory
3200
x104
1566F
Points Movement
data structures
,
dp
,
greedy
,
implementation
,
sortings
2600
x918
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
1562E
Rescue Niwen!
dp
,
greedy
,
string suffix structures
,
strings
2500
x1317
1562D1
Two Hundred Twenty One (easy version)
data structures
,
dp
,
math
1700
x6149
1561D1
Up the Strip (simplified version)
brute force
,
data structures
,
dp
,
math
,
number theory
1700
x5338
1560F2
Nearest Beautiful Number (hard version)
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
2100
x4166
1559E
Mocha and Stars
combinatorics
,
dp
,
fft
,
math
,
number theory
2200
x2201
1559B
Mocha and Red and Blue
dp
,
greedy
900
x21842
1558B
Up the Strip
brute force
,
dp
,
math
,
number theory
,
two pointers
1900
x4567
1557D
Ezzat and Grid
data structures
,
dp
,
greedy
2200
x2440
1557C
Moamen and XOR
bitmasks
,
combinatorics
,
dp
,
math
,
matrices
1700
x8247
1556F
Sports Betting
bitmasks
,
combinatorics
,
dp
,
graphs
,
math
,
probabilities
2500
x1151
1556E
Equilibrium
data structures
,
dp
,
greedy
2200
x2499
1555D
Say No to Palindromes
brute force
,
constructive algorithms
,
dp
,
strings
1600
x11612
1555C
Coin Rows
brute force
,
constructive algorithms
,
dp
,
implementation
1300
x20654
1554E
You
dfs and similar
,
dp
,
math
,
number theory
2600
x1167
1553I
Stairs
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x185
1553D
Backspace
dp
,
greedy
,
strings
,
two pointers
1500
x13207
1553C
Penalty
bitmasks
,
brute force
,
dp
,
greedy
1200
x17165
1553B
Reverse String
brute force
,
dp
,
hashing
,
implementation
,
strings
1300
x13736
1552F
Telepanting
binary search
,
data structures
,
dp
,
sortings
2200
x2769
1552D
Array Differentiation
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
math
1800
x6635
1551F
Equidistant Vertices
brute force
,
combinatorics
,
dfs and similar
,
dp
,
trees
2200
x1719
1551E
Fixed Points
binary search
,
brute force
,
dp
2000
x3643
1550F
Jumping Around
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
graphs
,
shortest paths
2700
x620
1550E
Stringforces
binary search
,
bitmasks
,
brute force
,
dp
,
strings
,
two pointers
2500
x1431
1549B
Gregor and the Pawn Game
dfs and similar
,
dp
,
flows
,
graph matchings
,
graphs
,
greedy
,
implementation
800
x23626
1548C
The Three Little Pigs
combinatorics
,
dp
,
fft
,
math
2500
x1725
1547G
How Many Paths?
dfs and similar
,
dp
,
graphs
,
trees
2100
x2735
1547E
Air Conditioners
data structures
,
dp
,
implementation
,
shortest paths
,
sortings
,
two pointers
1500
x13655
1545F
AquaMoon and Potatoes
brute force
,
data structures
,
dp
3500
x99
1545E2
AquaMoon and Time Stop (hard version)
data structures
,
dp
3500
x78
1545E1
AquaMoon and Time Stop (easy version)
data structures
,
dp
3500
x73
1542E2
Abnormal Permutation Pairs (hard version)
combinatorics
,
dp
,
fft
,
math
2700
x794
1542E1
Abnormal Permutation Pairs (easy version)
combinatorics
,
dp
,
fft
,
math
2400
x1174
1542D
Priority Queue
combinatorics
,
dp
,
implementation
,
math
,
ternary search
2200
x2514
1540C2
Converging Array (Hard Version)
dp
,
math
2900
x427
1540C1
Converging Array (Easy Version)
dp
,
math
2700
x577
1540B
Tree Array
brute force
,
combinatorics
,
dp
,
graphs
,
math
,
probabilities
,
trees
2300
x2469
1539E
Game with Cards
binary search
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
2500
x908
1539B
Love Song
dp
,
implementation
,
strings
800
x23606
1538F
Interesting Function
binary search
,
dp
,
math
,
number theory
1500
x18091
1538A
Stone Game
brute force
,
dp
,
greedy
800
x35455
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x12074
1536C
Diluc and Kaeya
data structures
,
dp
,
hashing
,
number theory
1500
x13437
1535E
Gold Transfer
binary search
,
data structures
,
dp
,
greedy
,
interactive
,
trees
2200
x2616
1535D
Playoff Tournament
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1800
x7431
1535C
Unstable String
binary search
,
dp
,
greedy
,
implementation
,
strings
,
two pointers
1400
x15949
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x141
1534G
A New Beginning
data structures
,
dp
,
geometry
,
sortings
3300
x499
1534F2
Falling Sand (Hard Version)
dfs and similar
,
dp
,
graphs
,
greedy
3000
x497
1534C
Little Alawn's Puzzle
combinatorics
,
dp
,
dsu
,
graphs
,
math
1300
x12413
1533H
Submatrices
*special problem
,
bitmasks
,
data structures
,
dp
x79
1531C
Симметричный амфитеатр
*special problem
,
constructive algorithms
,
dp
x643
1530H
Turing's Award
data structures
,
dp
3400
x126
1530F
Bingo
bitmasks
,
combinatorics
,
dp
,
math
,
probabilities
2600
x724
1528E
Mashtali and Hagh Trees
combinatorics
,
dp
,
trees
2900
x493
1528B
Kavi on Pairing Duty
combinatorics
,
dp
,
math
1700
x8404
1528A
Parsa's Humongous Tree
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
trees
1600
x13648
1527E
Partition Game
binary search
,
data structures
,
divide and conquer
,
dp
2500
x2050
1526C1
Potions (Easy Version)
brute force
,
data structures
,
dp
,
greedy
1500
x20880
1526B
I Hate 1111
dp
,
math
,
number theory
1400
x28203
1525F
Goblins And Gnomes
brute force
,
dp
,
flows
,
graph matchings
2800
x314
1525E
Assimilation IV
combinatorics
,
dp
,
math
,
probabilities
,
two pointers
2100
x1916
1525D
Armchairs
dp
,
flows
,
graph matchings
,
greedy
1800
x9279
1523H
Hopping Around the Array
data structures
,
dp
3500
x232
1523F
Favorite Game
bitmasks
,
dp
3300
x392
1523E
Crypto Lights
combinatorics
,
dp
,
math
,
probabilities
2600
x1514
1523D
Love-Hate
bitmasks
,
brute force
,
dp
,
probabilities
2400
x2060
1521E
Nastia and a Beautiful Matrix
binary search
,
constructive algorithms
,
dp
,
greedy
2700
x639
1521D
Nastia Plays with a Tree
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
2500
x1782
1519F
Chests and Keys
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
3200
x373
1519D
Maximum Sum of Products
brute force
,
dp
,
implementation
,
math
,
two pointers
1600
x14412
1519B
The Cake Is a Lie
dp
,
math
800
x29491
1517H
Fly Around the World
dp
,
geometry
3500
x63
1517F
Reunion
combinatorics
,
dp
,
trees
3200
x418
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