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CodeTON Round 8 (Div. 1 + Div. 2, Rated, Prizes!)
36:01:27
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Difficulty:
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sortings
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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Status
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Custom test
Problems
#
Name
1697B
Promo
greedy
,
sortings
900
x25181
1692G
2^Sort
data structures
,
dp
,
sortings
,
two pointers
1400
x15452
1692B
All Distinct
greedy
,
sortings
800
x32341
1691E
Number of Groups
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2300
x1712
1690G
Count the Trains
binary search
,
data structures
,
greedy
,
sortings
2000
x3170
1689A
Lex String
brute force
,
greedy
,
implementation
,
sortings
,
two pointers
800
x16313
1688B
Patchouli's Magical Talisman
bitmasks
,
constructive algorithms
,
greedy
,
sortings
800
x17771
1687C
Sanae and Giant Robot
binary search
,
brute force
,
data structures
,
dsu
,
greedy
,
sortings
2500
x1325
1687B
Railway System
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
1700
x3446
1685B
Linguistics
greedy
,
implementation
,
sortings
,
strings
2000
x3125
1685A
Circular Local MiniMax
constructive algorithms
,
greedy
,
sortings
1100
x16365
1684D
Traps
constructive algorithms
,
greedy
,
sortings
1700
x9212
1684C
Column Swapping
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
1400
x11939
1682F
MCMF?
data structures
,
flows
,
graphs
,
greedy
,
sortings
,
two pointers
2700
x282
1682E
Unordered Swaps
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
,
trees
2700
x551
1682B
AND Sorting
bitmasks
,
constructive algorithms
,
sortings
1100
x16879
1681C
Double Sort
implementation
,
sortings
1200
x16836
1676H2
Maximum Crossings (Hard Version)
data structures
,
divide and conquer
,
sortings
1500
x9852
1676F
Longest Strike
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1300
x15561
1676E
Eating Queries
binary search
,
greedy
,
sortings
1100
x24170
1676B
Equal Candies
greedy
,
math
,
sortings
800
x44236
1674D
A-B-C Sort
constructive algorithms
,
implementation
,
sortings
1200
x15623
1671E
Preorder
combinatorics
,
divide and conquer
,
dp
,
dsu
,
hashing
,
sortings
,
trees
2100
x2618
1671B
Consecutive Points Segment
brute force
,
math
,
sortings
1000
x18032
1670A
Prof. Slim
greedy
,
implementation
,
sortings
800
x15178
1669B
Triple
implementation
,
sortings
800
x38978
1668B
Social Distance
greedy
,
math
,
sortings
900
x16226
1665C
Tree Infection
binary search
,
greedy
,
sortings
,
trees
1600
x7963
1665B
Array Cloning Technique
constructive algorithms
,
greedy
,
sortings
900
x18280
1662N
Drone Photo
combinatorics
,
math
,
sortings
x676
1662I
Ice Cream Shop
brute force
,
implementation
,
sortings
x1936
1658E
Gojou and Matrix Game
data structures
,
dp
,
games
,
hashing
,
implementation
,
math
,
number theory
,
sortings
2500
x992
1657D
For Gamers. By Gamers.
binary search
,
brute force
,
greedy
,
math
,
sortings
2000
x4666
1656F
Parametric MST
binary search
,
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
2600
x974
1656C
Make Equal With Mod
constructive algorithms
,
math
,
number theory
,
sortings
1200
x18291
1656A
Good Pairs
math
,
sortings
800
x19157
1654F
Minimal String Xoration
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
hashing
,
sortings
,
strings
2800
x1022
1654C
Alice and the Cake
data structures
,
greedy
,
implementation
,
sortings
1400
x13043
1654A
Maximum Cake Tastiness
brute force
,
greedy
,
implementation
,
sortings
800
x18354
1650E
Rescheduling the Exam
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
1900
x3969
1650C
Weight of the System of Nested Segments
greedy
,
hashing
,
implementation
,
sortings
1200
x16095
1648A
Weird Sum
combinatorics
,
data structures
,
geometry
,
math
,
matrices
,
sortings
1400
x11527
1646B
Quality vs Quantity
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
800
x20769
1641C
Anonymity Is Important
binary search
,
brute force
,
data structures
,
dsu
,
greedy
,
sortings
2200
x2293
1641B
Repetitions Decoding
constructive algorithms
,
implementation
,
sortings
2000
x3708
1641A
Great Sequence
brute force
,
greedy
,
sortings
1200
x17383
1638B
Odd Swap Sort
data structures
,
math
,
sortings
1100
x20267
1637H
Minimize Inversions Number
data structures
,
greedy
,
math
,
sortings
3500
x297
1637A
Sorting Parts
brute force
,
sortings
800
x21991
1635E
Cars
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2200
x2123
1633E
Spanning Tree Queries
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1452
1630C
Paint the Middle
dp
,
greedy
,
sortings
,
two pointers
2200
x2803
1629A
Download More RAM
brute force
,
greedy
,
sortings
800
x28404
1628F
Spaceship Crisis Management
binary search
,
data structures
,
geometry
,
sortings
3500
x81
1627B
Not Sitting
games
,
greedy
,
sortings
1300
x16180
1626A
Equidistant Letters
constructive algorithms
,
sortings
800
x28183
1625D
Binary Spiders
bitmasks
,
data structures
,
implementation
,
math
,
sortings
,
trees
2300
x1946
1625B
Elementary Particles
brute force
,
greedy
,
sortings
1100
x15797
1624D
Palindromes Coloring
binary search
,
greedy
,
sortings
,
strings
1400
x16039
1623B
Game on Ranges
brute force
,
dfs and similar
,
implementation
,
sortings
1100
x13852
1622C
Set or Decrease
binary search
,
brute force
,
greedy
,
sortings
1600
x12163
1622B
Berland Music
data structures
,
greedy
,
math
,
sortings
1000
x20415
1621E
New School
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
2300
x1697
1619G
Unusual Minesweeper
binary search
,
dfs and similar
,
dsu
,
greedy
,
sortings
2000
x2233
1619E
MEX and Increments
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
sortings
1700
x8541
1619D
New Year's Problem
binary search
,
greedy
,
sortings
1800
x7160
1618G
Trader Problem
data structures
,
dsu
,
greedy
,
sortings
2200
x1441
1618A
Polycarp and Sums of Subsequences
math
,
sortings
800
x31280
1617C
Paprika and Permutation
binary search
,
greedy
,
math
,
sortings
1300
x14347
1617A
Forbidden Subsequence
constructive algorithms
,
greedy
,
sortings
,
strings
800
x16054
1615E
Purple Crayon
data structures
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1375
1614B
Divan and a New Project
constructive algorithms
,
sortings
1000
x17571
1613B
Absent Remainder
greedy
,
implementation
,
sortings
1000
x21039
1612G
Max Sum Array
combinatorics
,
constructive algorithms
,
greedy
,
sortings
2500
x808
1612E
Messages
brute force
,
dp
,
greedy
,
probabilities
,
sortings
2000
x2363
1608E
The Cells on the Paper
binary search
,
implementation
,
sortings
2800
x419
1607H
Banquet Preparations 2
greedy
,
sortings
,
two pointers
2200
x1174
1607D
Blue-Red Permutation
greedy
,
math
,
sortings
1300
x16146
1607C
Minimum Extraction
brute force
,
sortings
1000
x24091
1606D
Red-Blue Matrix
brute force
,
constructive algorithms
,
implementation
,
sortings
2400
x1390
1605E
Array Equalizer
binary search
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2400
x983
1605B
Reverse Sort
greedy
,
sortings
1000
x17502
1601D
Difficult Mountain
data structures
,
dp
,
greedy
,
sortings
2700
x1353
1601C
Optimal Insertion
data structures
,
divide and conquer
,
dp
,
greedy
,
sortings
2300
x1898
1592B
Hemose Shopping
constructive algorithms
,
dsu
,
math
,
sortings
1200
x15491
1592A
Gamer Hemose
binary search
,
greedy
,
math
,
sortings
800
x21357
1584C
Two Arrays
greedy
,
math
,
sortings
900
x15764
1583H
Omkar and Tours
data structures
,
divide and conquer
,
sortings
,
trees
3300
x306
1579B
Shifting Sort
implementation
,
sortings
1100
x17711
1575L
Longest Array Deconstruction
data structures
,
divide and conquer
,
dp
,
sortings
2100
x1211
1575A
Another Sorting Problem
data structures
,
sortings
,
strings
1100
x4164
1574C
Slay the Dragon
binary search
,
greedy
,
sortings
,
ternary search
1300
x16353
1573B
Swaps
greedy
,
math
,
sortings
1400
x14103
1572A
Book
binary search
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
1800
x8447
1569D
Inconvenient Pairs
binary search
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x4215
1566F
Points Movement
data structures
,
dp
,
greedy
,
implementation
,
sortings
2600
x918
1566D2
Seating Arrangements (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1600
x7655
1566D1
Seating Arrangements (easy version)
data structures
,
greedy
,
sortings
1100
x13672
1561C
Deep Down Below
binary search
,
greedy
,
sortings
1300
x13203
1561A
Simply Strange Sort
brute force
,
implementation
,
sortings
800
x16417
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