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Before contest
Kotlin Heroes: Episode 11
8 days
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Difficulty:
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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
1817A
Almost Increasing Subsequence
binary search
,
data structures
,
greedy
1500
x10971
1816B
Grid Reconstruction
constructive algorithms
,
greedy
1000
x15217
1816A
Ian Visits Mary
constructive algorithms
,
geometry
,
number theory
800
x17549
1815F
OH NO1 (-2-3-4)
constructive algorithms
,
graphs
,
math
3500
x222
1815E
Bosco and Particle
dp
,
math
,
number theory
,
strings
3100
x347
1815D
XOR Counting
bitmasks
,
combinatorics
,
dp
,
math
2600
x1138
1815C
Between
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2200
x1957
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x3023
1815A
Ian and Array Sorting
greedy
,
math
1300
x14071
1814F
Communication Towers
brute force
,
divide and conquer
,
dsu
2700
x613
1814E
Chain Chips
data structures
,
dp
,
matrices
2300
x1332
1814D
Balancing Weapons
binary search
,
brute force
,
data structures
,
math
,
two pointers
2500
x860
1814C
Search in Parallel
constructive algorithms
,
greedy
,
sortings
1500
x10763
1814B
Long Legs
brute force
,
math
1700
x9959
1814A
Coins
implementation
,
math
800
x28565
1812J
Unmysterious Language
*special problem
,
constructive algorithms
,
strings
x5899
1812I
Mountain Climber
*special problem
x261
1812H
Expected Twist
*special problem
,
interactive
x141
1812G
Colour Vision
*special problem
,
implementation
x548
1812F
Factorization
*special problem
,
number theory
x1247
1812E
Not a Geometry Problem
*special problem
,
*special problem
,
constructive algorithms
,
geometry
,
math
x4002
1812D
Trivial Conjecture
*special problem
,
constructive algorithms
,
math
,
number theory
x4652
1812C
Digits
*special problem
x1262
1812B
Was it Rated?
*special problem
,
*special problem
,
*special problem
,
brute force
,
implementation
x5684
1812A
Are You a Robot?
*special problem
,
*special problem
,
*special problem
,
expression parsing
,
strings
x13274
1811G2
Vlad and the Nice Paths (hard version)
binary search
,
combinatorics
,
data structures
,
dp
,
math
,
two pointers
2200
x1748
1811G1
Vlad and the Nice Paths (easy version)
combinatorics
,
dp
,
math
2100
x2061
1811F
Is It Flower?
dfs and similar
,
graphs
,
implementation
2100
x1825
1811E
Living Sequence
binary search
,
dp
,
math
,
number theory
1500
x12252
1811D
Umka and a Long Flight
constructive algorithms
,
implementation
,
math
1600
x7457
1811C
Restore the Array
constructive algorithms
,
greedy
1100
x19749
1811B
Conveyor Belts
implementation
,
math
1000
x20309
1811A
Insert Digit
greedy
,
math
,
strings
800
x30996
1810H
Last Number
combinatorics
,
math
2900
x139
1810G
The Maximum Prefix
dp
3200
x706
1810F
M-tree
data structures
,
math
,
sortings
,
trees
2800
x569
1810E
Monsters
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x3165
1810D
Climbing the Tree
binary search
,
math
1700
x7409
1810C
Make It Permutation
brute force
,
greedy
,
sortings
1300
x14459
1810B
Candies
constructive algorithms
,
math
,
number theory
800
x17466
1810A
Beautiful Sequence
brute force
,
greedy
800
x20678
1809G
Prediction
combinatorics
,
dp
,
math
2800
x440
1809F
Traveling in Berland
binary search
,
data structures
,
graphs
,
greedy
,
implementation
2500
x760
1809E
Two Tanks
binary search
,
dp
,
implementation
,
math
2400
x831
1809D
Binary String Sorting
constructive algorithms
,
greedy
1800
x6258
1809C
Sum on Subarrays
constructive algorithms
,
greedy
,
math
1500
x12697
1809B
Points on Plane
binary search
,
greedy
,
math
1000
x19685
1809A
Garland
implementation
800
x23818
1808E3
Minibuses on Venus (hard version)
brute force
,
combinatorics
,
dp
,
math
2800
x434
1808E2
Minibuses on Venus (medium version)
combinatorics
,
divide and conquer
,
dp
,
matrices
2500
x681
1808E1
Minibuses on Venus (easy version)
combinatorics
,
divide and conquer
,
dp
2200
x1322
1808D
Petya, Petya, Petr, and Palindromes
binary search
,
brute force
,
data structures
,
two pointers
2100
x2303
1808C
Unlucky Numbers
brute force
,
dp
,
greedy
,
implementation
1900
x3763
1808B
Playing in a Casino
math
,
sortings
1200
x16655
1808A
Lucky Numbers
brute force
,
implementation
900
x18126
1807G2
Subsequence Addition (Hard Version)
bitmasks
,
dp
,
greedy
,
implementation
,
sortings
1100
x19205
1807G1
Subsequence Addition (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
1100
x18815
1807F
Bouncy Ball
brute force
,
dfs and similar
,
implementation
1700
x6234
1807E
Interview
binary search
,
implementation
,
interactive
1300
x12874
1807D
Odd Queries
data structures
,
implementation
900
x32215
1807C
Find and Replace
greedy
,
implementation
,
strings
800
x30314
1807B
Grab the Candies
greedy
800
x41651
1807A
Plus or Minus
implementation
800
x60982
1806F2
GCD Master (hard version)
greedy
,
math
,
sortings
2900
x293
1806F1
GCD Master (easy version)
greedy
,
math
,
number theory
,
sortings
2900
x349
1806E
Tree Master
brute force
,
data structures
,
dfs and similar
,
trees
2200
x2820
1806D
DSU Master
combinatorics
,
dp
,
dsu
,
math
2500
x898
1806C
Sequence Master
brute force
,
constructive algorithms
,
math
1600
x7575
1806B
Mex Master
constructive algorithms
,
greedy
900
x17650
1806A
Walking Master
geometry
,
greedy
,
math
800
x24502
1805F2
Survival of the Weakest (hard version)
greedy
,
math
,
sortings
,
two pointers
3100
x347
1805F1
Survival of the Weakest (easy version)
binary search
,
brute force
,
implementation
,
math
,
sortings
2600
x895
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1604
1805D
A Wide, Wide Graph
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1800
x6516
1805C
Place for a Selfie
binary search
,
data structures
,
geometry
,
math
1400
x12514
1805B
The String Has a Target
greedy
,
strings
800
x18526
1805A
We Need the Zero
bitmasks
,
brute force
800
x23259
1804H
Code Lock
bitmasks
,
dp
3300
x185
1804G
Flow Control
data structures
,
dsu
,
implementation
3500
x202
1804F
Approximate Diameter
binary search
,
divide and conquer
,
graphs
,
shortest paths
2700
x906
1804E
Routing
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x1441
1804D
Accommodation
brute force
,
dp
,
greedy
,
implementation
2000
x4616
1804C
Pull Your Luck
brute force
,
greedy
,
math
,
number theory
1500
x12070
1804B
Vaccination
greedy
,
implementation
1000
x14218
1804A
Lame King
greedy
,
math
800
x17914
1802B
Settlement of Guinea Pigs
greedy
,
implementation
,
math
1000
x13270
1802A
Likes
greedy
,
implementation
800
x15746
1801G
A task for substrings
data structures
,
string suffix structures
,
strings
3400
x370
1801F
Another n-dimensional chocolate bar
dp
,
math
,
meet-in-the-middle
,
number theory
2700
x580
1801E
Gasoline prices
data structures
,
divide and conquer
,
dsu
,
hashing
,
trees
3000
x449
1801D
The way home
binary search
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x2197
1801C
Music Festival
binary search
,
data structures
,
dp
,
greedy
,
sortings
1900
x3414
1801B
Buying gifts
data structures
,
greedy
,
sortings
1800
x6199
1801A
The Very Beautiful Blanket
bitmasks
,
constructive algorithms
1600
x8531
1800G
Symmetree
dfs and similar
,
hashing
,
implementation
,
trees
2200
x2050
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3875
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x12742
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x12772
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x23393
1800C2
Powering the Hero (hard version)
data structures
,
greedy
1100
x22375
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