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When submitting a solution in C++, please select either C++14 (GCC 6-32) or C++17 (GCC 7-32) as your compiler.
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Before contest
Codeforces Round 935 (Div. 3)
04:32:55
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Difficulty:
—
implementation
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
1948E
Clique Partition
constructive algorithms
,
graphs
,
greedy
,
implementation
x1784
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
x16002
1943B
Non-Palindromic Substring
data structures
,
hashing
,
implementation
,
math
,
strings
x2095
1941D
Rudolf and the Ball Game
dfs and similar
,
dp
,
implementation
1200
x14550
1940B
Three Arrays
*special problem
,
constructive algorithms
,
implementation
,
sortings
x140
1937B
Binary Path
dp
,
greedy
,
implementation
1300
x11615
1937A
Shuffle Party
implementation
,
math
800
x19527
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x862
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2009
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x275
1935D
Exam in MAC
binary search
,
combinatorics
,
implementation
,
math
1800
x6392
1933E
Turtle vs. Rabbit Race: Optimal Trainings
binary search
,
implementation
,
math
,
ternary search
1500
x8591
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x18924
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x27918
1932E
Final Countdown
implementation
,
math
,
number theory
1600
x5852
1932D
Card Game
greedy
,
implementation
1400
x8730
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x12240
1932A
Thorns and Coins
dp
,
greedy
,
implementation
800
x24717
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2192
1928F
Digital Patterns
combinatorics
,
data structures
,
implementation
,
math
2900
x186
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x3467
1926G
Vlad and Trouble at MIT
dfs and similar
,
dp
,
flows
,
graphs
,
greedy
,
implementation
,
trees
1900
x2548
1926F
Vlad and Avoiding X
bitmasks
,
brute force
,
dfs and similar
,
dp
,
implementation
2200
x1273
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x8714
1926C
Vlad and a Sum of Sum of Digits
dp
,
implementation
1200
x20716
1926B
Vlad and Shapes
geometry
,
implementation
800
x27510
1926A
Vlad and the Best of Five
implementation
800
x37986
1924B
Space Harbour
data structures
,
implementation
,
math
,
sortings
2100
x2138
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x284
1923B
Monsters Attack!
dp
,
greedy
,
implementation
1100
x15048
1923A
Moving Chips
greedy
,
implementation
800
x22082
1922D
Berserk Monsters
brute force
,
data structures
,
dsu
,
implementation
,
math
1900
x4919
1922C
Closest Cities
greedy
,
implementation
,
math
1300
x16192
1922A
Tricky Template
constructive algorithms
,
implementation
,
strings
800
x25289
1921G
Mischievous Shooter
brute force
,
data structures
,
divide and conquer
,
dp
,
implementation
2200
x1039
1921F
Sum of Progression
brute force
,
data structures
,
dp
,
implementation
,
math
1900
x3251
1921B
Arranging Cats
greedy
,
implementation
800
x31149
1920D
Array Repetition
binary search
,
brute force
,
dsu
,
implementation
,
math
1900
x4844
1919E
Counting Prefixes
combinatorics
,
constructive algorithms
,
dp
,
implementation
,
math
2600
x731
1918F
Caterpillar on a Tree
dfs and similar
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
2500
x687
1918E
ace5 and Task Order
constructive algorithms
,
divide and conquer
,
implementation
,
interactive
,
probabilities
,
sortings
2200
x1398
1918D
Blocking Elements
binary search
,
data structures
,
dp
,
implementation
,
two pointers
1900
x3999
1918C
XOR-distance
bitmasks
,
greedy
,
implementation
,
math
1400
x11906
1918B
Minimize Inversions
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
900
x21290
1918A
Brick Wall
constructive algorithms
,
greedy
,
implementation
,
math
800
x27941
1917D
Yet Another Inversions Problem
combinatorics
,
data structures
,
dp
,
implementation
,
math
,
number theory
2300
x1571
1917C
Watering an Array
brute force
,
greedy
,
implementation
,
math
1600
x8974
1916C
Training Before the Olympiad
constructive algorithms
,
games
,
greedy
,
implementation
,
math
1200
x16172
1916A
2023
constructive algorithms
,
implementation
,
math
,
number theory
800
x24001
1915G
Bicycles
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
1800
x5076
1915D
Unnatural Language Processing
greedy
,
implementation
,
strings
900
x26327
1915C
Can I Square?
binary search
,
implementation
800
x35492
1915B
Not Quite Latin Square
bitmasks
,
brute force
,
implementation
800
x36707
1915A
Odd One Out
bitmasks
,
implementation
800
x46495
1914D
Three Activities
brute force
,
dp
,
greedy
,
implementation
,
sortings
1200
x16849
1914A
Problemsolving Log
implementation
,
strings
800
x28822
1913A
Rating Increase
implementation
800
x21627
1912E
Evaluate It and Back Again
constructive algorithms
,
implementation
,
math
2200
x696
1912A
Accumulator Apex
data structures
,
implementation
,
sortings
1900
x1667
1910C
Poisonous Swamp
*special problem
,
*special problem
,
implementation
,
implementation
1600
x544
1910A
Username
*special problem
,
implementation
1100
x1461
1909A
Distinct Buttons
implementation
,
math
800
x15341
1907G
Lights
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
2200
x1675
1907B
YetnotherrokenKeoard
data structures
,
implementation
,
strings
1000
x22276
1907A
Rook
implementation
800
x32802
1905D
Cyclic MEX
data structures
,
implementation
,
math
,
two pointers
2000
x3308
1904F
Beautiful Tree
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2800
x282
1904E
Tree Queries
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2500
x748
1904D2
Set To Max (Hard Version)
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
sortings
1800
x3557
1904A
Forked!
brute force
,
implementation
900
x14354
1902F
Trees and XOR Queries Again
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
implementation
,
math
,
trees
2400
x841
1902D
Robot Queries
binary search
,
data structures
,
dp
,
implementation
1900
x3483
1901D
Yet Another Monster Fight
binary search
,
dp
,
greedy
,
implementation
,
math
1700
x5818
1900F
Local Deletions
binary search
,
data structures
,
implementation
2800
x224
1900E
Transitive Graph
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
2100
x1691
1900A
Cover in Water
constructive algorithms
,
greedy
,
implementation
,
strings
800
x19479
1899E
Queue Sort
greedy
,
implementation
,
sortings
1300
x13343
1899B
250 Thousand Tons of TNT
brute force
,
implementation
,
number theory
1100
x17212
1898A
Milica and String
brute force
,
implementation
,
strings
800
x14655
1896G
Pepe Racing
constructive algorithms
,
implementation
,
interactive
,
sortings
3200
x214
1896F
Bracket Xoring
constructive algorithms
,
greedy
,
implementation
,
math
2600
x612
1895C
Torn Lucky Ticket
brute force
,
dp
,
hashing
,
implementation
,
math
1400
x9736
1894A
Secret Sport
implementation
,
strings
800
x17670
1893C
Freedom of Choice
brute force
,
greedy
,
implementation
2000
x2333
1893A
Anonymous Informant
brute force
,
dfs and similar
,
graphs
,
implementation
1400
x10819
1891E
Brukhovich and Exams
brute force
,
greedy
,
implementation
,
math
,
sortings
2500
x755
1890B
Qingshan Loves Strings
constructive algorithms
,
implementation
800
x16360
1889D
Game of Stacks
brute force
,
dfs and similar
,
graphs
,
implementation
,
trees
3000
x489
1889A
Qingshan Loves Strings 2
constructive algorithms
,
greedy
,
implementation
1300
x11640
1886C
Decreasing String
implementation
,
strings
1600
x9753
1884E
Hard Design
greedy
,
implementation
,
math
2800
x252
1881C
Perfect Square
brute force
,
implementation
1200
x15401
1879E
Interactive Game with Coloring
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
interactive
,
trees
2400
x1160
1878G
wxhtzdy ORO Tree
binary search
,
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
implementation
,
trees
2300
x1053
1874A
Jellyfish and Game
brute force
,
games
,
greedy
,
implementation
1200
x15295
1873D
1D Eraser
greedy
,
implementation
,
two pointers
800
x31585
1873C
Target Practice
implementation
,
math
800
x33117
1873A
Short Sort
brute force
,
implementation
800
x46423
1872F
Selling a Menagerie
dfs and similar
,
dsu
,
graphs
,
implementation
,
math
1800
x5568
1872B
The Corridor or There and Back Again
greedy
,
implementation
900
x26062
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