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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
15:44:23
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Difficulty:
—
greedy
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
1601D
Difficult Mountain
data structures
,
dp
,
greedy
,
sortings
2700
x1481
1601C
Optimal Insertion
data structures
,
divide and conquer
,
dp
,
greedy
,
sortings
2300
x2056
1601A
Array Elimination
bitmasks
,
greedy
,
math
,
number theory
1300
x14855
1600E
Array Game
games
,
greedy
,
two pointers
1900
x2126
1599J
Bob's Beautiful Array
bitmasks
,
brute force
,
greedy
2600
x303
1599A
Weights
constructive algorithms
,
greedy
,
two pointers
2600
x690
1594C
Make Them Equal
brute force
,
greedy
,
math
,
strings
1200
x19861
1593G
Changing Brackets
constructive algorithms
,
data structures
,
dp
,
greedy
2200
x1726
1593E
Gardener and Tree
brute force
,
data structures
,
dfs and similar
,
greedy
,
implementation
,
trees
1600
x12580
1593C
Save More Mice
binary search
,
greedy
,
greedy
1000
x25076
1593B
Make it Divisible by 25
dfs and similar
,
dp
,
greedy
,
math
,
math
900
x27709
1592F2
Alice and Recoloring 2
constructive algorithms
,
flows
,
graph matchings
,
greedy
2800
x777
1592F1
Alice and Recoloring 1
constructive algorithms
,
greedy
2600
x911
1592E
Bored Bakry
bitmasks
,
greedy
,
math
,
two pointers
2400
x1667
1592A
Gamer Hemose
binary search
,
greedy
,
math
,
sortings
800
x22394
1585C
Minimize Distance
greedy
1300
x12128
1585B
Array Eversion
greedy
900
x15216
1584F
Strange LCS
bitmasks
,
dp
,
graphs
,
greedy
,
strings
2600
x987
1584E
Game with Stones
binary search
,
data structures
,
games
,
greedy
2300
x1297
1584C
Two Arrays
greedy
,
math
,
sortings
900
x16507
1584B
Coloring Rectangles
greedy
,
math
1000
x13418
1583E
Moment of Bloom
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
greedy
,
trees
2200
x2239
1583D
Omkar and the Meaning of Life
constructive algorithms
,
greedy
,
interactive
1800
x5427
1582F2
Korney Korneevich and XOR (hard version)
binary search
,
brute force
,
dp
,
greedy
,
two pointers
2400
x1851
1582F1
Korney Korneevich and XOR (easy version)
bitmasks
,
dp
,
greedy
1800
x5694
1582E
Pchelyonok and Segments
binary search
,
data structures
,
dp
,
greedy
,
math
2000
x3792
1582C
Grandma Capa Knits a Scarf
brute force
,
data structures
,
greedy
,
strings
,
two pointers
1200
x15931
1581B
Diameter of Graph
constructive algorithms
,
graphs
,
greedy
,
math
1200
x11479
1580D
Subsequence
brute force
,
divide and conquer
,
dp
,
greedy
,
trees
2900
x919
1580A
Portal
brute force
,
data structures
,
dp
,
greedy
,
implementation
1700
x3698
1579E2
Array Optimization by Deque
data structures
,
greedy
1700
x6714
1579E1
Permutation Minimization by Deque
constructive algorithms
,
greedy
,
math
1000
x21825
1579D
Productive Meeting
constructive algorithms
,
graphs
,
greedy
1400
x16192
1579C
Ticks
greedy
,
implementation
1500
x10629
1578L
Labyrinth
binary search
,
dsu
,
greedy
2400
x1220
1574D
The Strongest Build
binary search
,
brute force
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
hashing
,
implementation
2000
x4525
1574C
Slay the Dragon
binary search
,
greedy
,
sortings
,
ternary search
1300
x17260
1574B
Combinatorics Homework
combinatorics
,
greedy
,
math
1100
x17369
1573B
Swaps
greedy
,
math
,
sortings
1400
x14656
1573A
Countdown
greedy
800
x21213
1572D
Bridge Club
flows
,
graph matchings
,
graphs
,
greedy
2800
x516
1572C
Paint
dp
,
greedy
2700
x1502
1572B
Xor of 3
brute force
,
constructive algorithms
,
greedy
,
two pointers
2500
x1857
1571E
Fix the String
*special problem
,
bitmasks
,
dp
,
greedy
1700
x340
1567D
Expression Evaluation Error
constructive algorithms
,
greedy
,
implementation
,
math
2000
x4538
1567B
MEXor Mixup
bitmasks
,
greedy
1000
x23451
1566G
Four Vertices
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
3100
x343
1566F
Points Movement
data structures
,
dp
,
greedy
,
implementation
,
sortings
2600
x961
1566E
Buds Re-hanging
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x4167
1566D2
Seating Arrangements (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1600
x7892
1566D1
Seating Arrangements (easy version)
data structures
,
greedy
,
sortings
1100
x14059
1566C
MAX-MEX Cut
bitmasks
,
constructive algorithms
,
dp
,
greedy
1000
x17686
1566B
MIN-MEX Cut
bitmasks
,
constructive algorithms
,
dp
,
greedy
800
x19756
1566A
Median Maximization
binary search
,
greedy
,
math
800
x23548
1562E
Rescue Niwen!
dp
,
greedy
,
string suffix structures
,
strings
2500
x1424
1562A
The Miracle and the Sleeper
greedy
,
math
800
x25690
1561C
Deep Down Below
binary search
,
greedy
,
sortings
1300
x14965
1560F2
Nearest Beautiful Number (hard version)
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
2100
x4426
1560F1
Nearest Beautiful Number (easy version)
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
1900
x6184
1560D
Make a Power of Two
greedy
,
math
,
strings
1300
x18284
1559D2
Mocha and Diana (Hard Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
,
two pointers
2500
x2679
1559D1
Mocha and Diana (Easy Version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
1400
x13982
1559B
Mocha and Red and Blue
dp
,
greedy
900
x22660
1558E
Down Below
binary search
,
dfs and similar
,
graphs
,
greedy
,
meet-in-the-middle
,
shortest paths
3000
x478
1558C
Bottom-Tier Reversals
constructive algorithms
,
greedy
2000
x3308
1557D
Ezzat and Grid
data structures
,
dp
,
greedy
2200
x2583
1557B
Moamen and k-subarrays
greedy
,
sortings
1100
x23543
1556H
DIY Tree
graphs
,
greedy
,
math
,
probabilities
3300
x376
1556E
Equilibrium
data structures
,
dp
,
greedy
2200
x2733
1554D
Diane
constructive algorithms
,
greedy
,
strings
1800
x9553
1554C
Mikasa
binary search
,
bitmasks
,
greedy
,
implementation
1800
x8974
1554B
Cobb
bitmasks
,
brute force
,
greedy
,
math
1700
x12873
1554A
Cherry
greedy
800
x29484
1553D
Backspace
dp
,
greedy
,
strings
,
two pointers
1500
x13845
1553C
Penalty
bitmasks
,
brute force
,
dp
,
greedy
1200
x18020
1552E
Colors and Intervals
constructive algorithms
,
data structures
,
greedy
,
sortings
2300
x1904
1552C
Maximize the Intersections
combinatorics
,
constructive algorithms
,
geometry
,
greedy
,
sortings
1800
x5950
1552B
Running for Gold
combinatorics
,
graphs
,
greedy
,
sortings
1500
x15547
1551C
Interesting Story
greedy
,
sortings
,
strings
1500
x13400
1551B2
Wonderful Coloring - 2
binary search
,
constructive algorithms
,
data structures
,
greedy
1400
x15601
1551B1
Wonderful Coloring - 1
greedy
,
strings
800
x29607
1551A
Polycarp and Coins
greedy
,
math
800
x51517
1550C
Manhattan Subarrays
brute force
,
geometry
,
greedy
,
implementation
1700
x10239
1550B
Maximum Cost Deletion
greedy
,
math
1000
x26602
1550A
Find The Array
greedy
,
math
800
x28228
1549B
Gregor and the Pawn Game
dfs and similar
,
dp
,
flows
,
graph matchings
,
graphs
,
greedy
,
implementation
800
x24571
1548E
Gregor and the Two Painters
data structures
,
divide and conquer
,
graphs
,
greedy
,
math
3400
x463
1548A
Web of Lies
brute force
,
graphs
,
greedy
1400
x16532
1547D
Co-growing Sequence
bitmasks
,
constructive algorithms
,
greedy
1300
x16817
1547C
Pair Programming
greedy
,
two pointers
1100
x22807
1547B
Alphabetical Strings
greedy
,
implementation
,
strings
800
x26500
1546A
AquaMoon and Two Arrays
brute force
,
greedy
800
x18243
1543E
The Final Pursuit
bitmasks
,
constructive algorithms
,
divide and conquer
,
graphs
,
greedy
,
math
2700
x414
1543B
Customising the Track
combinatorics
,
greedy
,
math
900
x23240
1543A
Exciting Bets
greedy
,
math
,
number theory
900
x28742
1541A
Pretty Permutations
constructive algorithms
,
greedy
,
implementation
800
x29515
1540A
Great Graphs
constructive algorithms
,
graphs
,
greedy
,
shortest paths
,
sortings
1400
x14013
1539F
Strange Array
data structures
,
greedy
,
sortings
2600
x883
1539E
Game with Cards
binary search
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
2500
x960
1539D
PriceFixed
binary search
,
greedy
,
implementation
,
sortings
,
two pointers
1600
x11725
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