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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
3 days
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combine-tags-by-or
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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
883F
Lost in Transliteration
implementation
1300
x2283
883E
Field of Wonders
implementation
,
strings
1500
x1913
883D
Packmen Strike Back
binary search
,
dp
,
math
2500
x442
883C
Downloading B++
binary search
,
implementation
2300
x629
883B
Berland Army
constructive algorithms
,
graphs
,
greedy
2600
x378
883A
Automatic Door
implementation
2200
x594
879B
Table Tennis
data structures
,
implementation
1200
x12483
879A
Borya's Diagnosis
implementation
900
x9093
878E
Numbers on the blackboard
combinatorics
,
dp
3300
x578
878D
Magic Breeding
bitmasks
2900
x699
878C
Tournament
data structures
,
graphs
2700
x927
878B
Teams Formation
data structures
,
implementation
2300
x1071
878A
Short Program
bitmasks
,
constructive algorithms
1600
x5538
877F
Ann and Books
data structures
,
flows
,
hashing
2300
x1830
877E
Danil and a Part-time Job
bitmasks
,
data structures
,
trees
2000
x4584
877D
Olya and Energy Drinks
data structures
,
dfs and similar
,
graphs
,
shortest paths
2100
x4409
877C
Slava and tanks
constructive algorithms
1600
x5729
877B
Nikita and string
brute force
,
dp
1500
x10539
877A
Alex and broken contest
implementation
,
strings
1100
x10896
876B
Divisiblity of Differences
implementation
,
math
,
number theory
1300
x9220
876A
Trip For Meal
math
900
x9401
875F
Royal Questions
dsu
,
graphs
,
greedy
2500
x1359
875E
Delivery Club
binary search
,
data structures
,
dp
2600
x924
875D
High Cry
binary search
,
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
2200
x2286
875C
National Property
2-sat
,
dfs and similar
,
graphs
,
implementation
2100
x2136
875B
Sorting the Coins
dsu
,
implementation
,
sortings
,
two pointers
1500
x5212
875A
Classroom Watch
brute force
,
math
1200
x9648
873F
Forbidden Indices
dsu
,
string suffix structures
,
strings
2400
x1412
873E
Awards For Contestants
brute force
,
data structures
,
dp
2300
x702
873D
Merge Sort
constructive algorithms
,
divide and conquer
1800
x3187
873C
Strange Game On Matrix
greedy
,
two pointers
1600
x3277
873B
Balanced Substring
dp
,
implementation
1500
x7850
873A
Chores
implementation
800
x8300
871E
Restore the Tree
graphs
,
greedy
,
trees
2900
x149
870F
Paths
data structures
,
number theory
2700
x621
870E
Points, Lines and Ready-made Titles
dfs and similar
,
dsu
,
graphs
,
trees
2300
x1236
870D
Something with XOR Queries
brute force
,
interactive
,
probabilities
2000
x1232
870C
Maximum splitting
dp
,
greedy
,
math
,
number theory
1300
x9230
870B
Maximum of Maximums of Minimums
greedy
1200
x9598
870A
Search for Pretty Integers
brute force
,
implementation
900
x10205
869E
The Untended Antiquity
data structures
,
hashing
2400
x1809
869D
The Overdosing Ubiquity
brute force
,
dfs and similar
,
graphs
2800
x250
869C
The Intriguing Obsession
combinatorics
,
dp
,
math
1800
x4729
869B
The Eternal Immortality
math
1100
x13753
869A
The Artful Expedient
brute force
,
implementation
1100
x9470
868G
El Toll Caves
math
3300
x133
868F
Yet Another Minimization Problem
divide and conquer
,
dp
2500
x3859
868E
Policeman and a Tree
dp
,
graphs
,
trees
2700
x523
868D
Huge Strings
bitmasks
,
brute force
,
dp
,
implementation
,
strings
2200
x926
868C
Qualification Rounds
bitmasks
,
brute force
,
constructive algorithms
,
dp
1500
x4635
868B
Race Against Time
implementation
1400
x3686
868A
Bark to Unlock
brute force
,
implementation
,
strings
900
x8722
867A
Between the Offices
implementation
800
x19369
865G
Flowers and Chocolate
combinatorics
,
math
,
matrices
3300
x136
865F
Egg Roulette
bitmasks
,
brute force
,
divide and conquer
,
math
,
meet-in-the-middle
3300
x68
865E
Hex Dyslexia
bitmasks
,
brute force
,
dp
,
graphs
3300
x139
865D
Buy Low Sell High
constructive algorithms
,
data structures
,
greedy
2400
x5745
865C
Gotta Go Fast
binary search
,
dp
2400
x851
865B
Ordering Pizza
binary search
,
sortings
,
ternary search
1900
x1867
865A
Save the problem!
constructive algorithms
1400
x4333
864F
Cities Excursions
dfs and similar
,
graphs
,
trees
2700
x626
864E
Fire
dp
,
sortings
2000
x4283
864D
Make a Permutation!
greedy
,
implementation
,
math
1500
x6012
864C
Bus
greedy
,
implementation
,
math
1500
x5866
864B
Polycarp and Letters
brute force
,
implementation
,
strings
1000
x9161
864A
Fair Game
implementation
,
sortings
1000
x11676
863G
Graphic Settings
3200
x56
863F
Almost Permutation
flows
2200
x1265
863E
Turn Off The TV
data structures
,
sortings
2000
x3180
863D
Yet Another Array Queries Problem
data structures
,
implementation
1800
x3294
863C
1-2-3
graphs
,
implementation
1800
x2518
863B
Kayaking
brute force
,
greedy
,
sortings
1500
x8425
863A
Quasi-palindrome
brute force
,
implementation
900
x10259
862F
Mahmoud and Ehab and the final stage
data structures
,
strings
2900
x210
862E
Mahmoud and Ehab and the function
binary search
,
data structures
,
sortings
2100
x1667
862D
Mahmoud and Ehab and the binary string
binary search
,
divide and conquer
,
interactive
2000
x1888
862C
Mahmoud and Ehab and the xor
constructive algorithms
1900
x4098
862B
Mahmoud and Ehab and the bipartiteness
dfs and similar
,
graphs
,
trees
1300
x18333
862A
Mahmoud and Ehab and the MEX
greedy
,
implementation
1000
x9560
860E
Arkady and a Nobody-men
data structures
,
dfs and similar
,
trees
2700
x444
859G
Circle of Numbers
math
3000
x159
859F
Ordering T-Shirts
greedy
2800
x185
859E
Desk Disorder
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
trees
2100
x1868
859D
Third Month Insanity
dp
,
probabilities
,
trees
2100
x1052
859C
Pie Rules
dp
,
games
1500
x5434
859B
Lazy Security Guard
brute force
,
geometry
,
math
1000
x7064
859A
Declined Finalists
greedy
,
implementation
800
x7787
858F
Wizard's Tour
constructive algorithms
,
dfs and similar
,
graphs
2300
x1635
858E
Tests Renumeration
greedy
,
implementation
2200
x510
858D
Polycarp's phone book
data structures
,
implementation
,
sortings
1600
x3854
858C
Did you mean...
dp
,
greedy
,
implementation
1500
x5636
858B
Which floor?
brute force
,
implementation
1500
x3748
858A
k-rounding
brute force
,
math
,
number theory
1100
x8074
856F
To Play or not to Play
greedy
3000
x104
856E
Satellites
3100
x71
856D
Masha and Cactus
dp
,
trees
2400
x411
856C
Eleventh Birthday
combinatorics
,
dp
,
math
2400
x627
856B
Similar Words
dp
,
hashing
,
strings
,
trees
2300
x515
856A
Set Theory
brute force
,
constructive algorithms
1600
x1444
855G
Harry Vs Voldemort
dfs and similar
,
dp
,
graphs
,
trees
3300
x222
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