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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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Codeforces Round 936 (Div. 2)
2 days
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Difficulty:
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constructive algorithms
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
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Status
Standings
Custom test
Problems
#
Name
1948E
Clique Partition
constructive algorithms
,
graphs
,
greedy
,
implementation
x1812
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
x11060
1948A
Special Characters
brute force
,
constructive algorithms
x21172
1945G
Cook and Porridge
binary search
,
constructive algorithms
,
data structures
x104
1945E
Binary Search
binary search
,
constructive algorithms
x2321
1944B
Equal XOR
bitmasks
,
constructive algorithms
x11117
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
x1119
1941G
Rudolf and Subway
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2000
x2251
1940D
Almost Certainly
*special problem
,
constructive algorithms
,
data structures
,
sortings
x95
1940B
Three Arrays
*special problem
,
constructive algorithms
,
implementation
,
sortings
x140
1940A
Parallel Universes
*special problem
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
x63
1939B
Evidence Board
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
x185
1939A
Draw Polygon Lines
*special problem
,
constructive algorithms
,
dp
,
geometry
,
interactive
x11
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x5870
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x277
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x6172
1935B
Informatics in MAC
constructive algorithms
1200
x14810
1935A
Entertainment in MAC
constructive algorithms
,
strings
800
x23450
1934E
Weird LCM Operations
brute force
,
constructive algorithms
,
number theory
3000
x137
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x2715
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x5456
1933G
Turtle Magic: Royal Turtle Shell Pattern
bitmasks
,
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
2300
x747
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x16183
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x89
1930C
Lexicographically Largest
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
1700
x5951
1930B
Permutation Printing
brute force
,
constructive algorithms
,
math
1000
x12464
1929C
Sasha and the Casino
binary search
,
brute force
,
constructive algorithms
,
games
,
greedy
,
math
1400
x12408
1929B
Sasha and the Drawing
constructive algorithms
,
greedy
,
math
800
x22864
1929A
Sasha and the Beautiful Array
constructive algorithms
,
greedy
,
math
,
sortings
800
x27616
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1388
1927E
Klever Permutation
constructive algorithms
,
math
,
two pointers
1400
x11643
1927B
Following the String
constructive algorithms
,
greedy
,
strings
900
x29042
1925A
We Got Everything Covered!
constructive algorithms
,
greedy
,
strings
800
x26410
1924F
Anti-Proxy Attendance
constructive algorithms
,
dp
,
interactive
,
ternary search
3500
x114
1924A
Did We Get Everything Covered?
constructive algorithms
,
dp
,
greedy
,
shortest paths
,
strings
1500
x11676
1923D
Slimes
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x5271
1923C
Find B
constructive algorithms
,
greedy
1400
x11848
1922E
Increasing Subsequences
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
math
1800
x6718
1922B
Forming Triangles
combinatorics
,
constructive algorithms
,
math
,
sortings
1200
x18339
1922A
Tricky Template
constructive algorithms
,
implementation
,
strings
800
x25291
1919G
Tree LGM
constructive algorithms
,
divide and conquer
,
games
,
trees
3500
x141
1919E
Counting Prefixes
combinatorics
,
constructive algorithms
,
dp
,
implementation
,
math
2600
x731
1919D
01 Tree
constructive algorithms
,
data structures
,
dsu
,
greedy
,
sortings
,
trees
2100
x3478
1918G
Permutation of Given
constructive algorithms
,
math
2700
x388
1918E
ace5 and Task Order
constructive algorithms
,
divide and conquer
,
implementation
,
interactive
,
probabilities
,
sortings
2200
x1398
1918B
Minimize Inversions
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
900
x21298
1918A
Brick Wall
constructive algorithms
,
greedy
,
implementation
,
math
800
x27946
1917F
Construct Tree
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x849
1917E
Construct Matrix
constructive algorithms
,
math
2500
x1199
1917A
Least Product
constructive algorithms
,
math
800
x23547
1916F
Group Division
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2900
x376
1916D
Mathematical Problem
brute force
,
constructive algorithms
,
geometry
,
math
1700
x7650
1916C
Training Before the Olympiad
constructive algorithms
,
games
,
greedy
,
implementation
,
math
1200
x16176
1916B
Two Divisors
constructive algorithms
,
math
,
number theory
1000
x22806
1916A
2023
constructive algorithms
,
implementation
,
math
,
number theory
800
x24007
1914B
Preparing for the Contest
constructive algorithms
,
math
800
x27791
1912E
Evaluate It and Back Again
constructive algorithms
,
implementation
,
math
2200
x696
1912C
Cactus Transformation
constructive algorithms
3300
x42
1909H
Parallel Swaps Sort
constructive algorithms
,
data structures
3500
x54
1909E
Multiple Lamps
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2400
x1191
1909C
Heavy Intervals
constructive algorithms
,
data structures
,
dsu
,
greedy
,
math
,
sortings
1400
x9496
1909B
Make Almost Equal With Mod
bitmasks
,
constructive algorithms
,
math
,
number theory
1200
x12860
1907G
Lights
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
2200
x1675
1907D
Jumping Through Segments
binary search
,
constructive algorithms
1400
x11236
1907C
Removal of Unattractive Pairs
constructive algorithms
,
greedy
,
math
,
strings
1200
x17714
1906L
Palindromic Parentheses
constructive algorithms
2500
x410
1906E
Merge Not Sort
constructive algorithms
,
dp
1900
x1210
1906B
Button Pressing
bitmasks
,
constructive algorithms
,
hashing
2600
x420
1905A
Constructive Problems
constructive algorithms
,
math
800
x21236
1904D2
Set To Max (Hard Version)
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
sortings
1800
x3558
1904D1
Set To Max (Easy Version)
brute force
,
constructive algorithms
,
greedy
1600
x5295
1903C
Theofanis' Nightmare
constructive algorithms
,
greedy
1400
x9888
1903B
StORage room
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1200
x10876
1902C
Insert and Equalize
brute force
,
constructive algorithms
,
greedy
,
math
,
number theory
1300
x11701
1902A
Binary Imbalance
constructive algorithms
800
x19281
1901C
Add, Divide and Floor
constructive algorithms
,
greedy
,
math
1400
x10242
1900A
Cover in Water
constructive algorithms
,
greedy
,
implementation
,
strings
800
x19509
1899F
Alex's whims
constructive algorithms
,
graphs
,
greedy
,
shortest paths
,
trees
1600
x6337
1898C
Colorful Grid
constructive algorithms
1700
x4677
1896G
Pepe Racing
constructive algorithms
,
implementation
,
interactive
,
sortings
3200
x214
1896F
Bracket Xoring
constructive algorithms
,
greedy
,
implementation
,
math
2600
x612
1896C
Matching Arrays
binary search
,
constructive algorithms
,
greedy
,
sortings
1400
x8169
1895D
XOR Construction
bitmasks
,
constructive algorithms
,
data structures
,
math
,
string suffix structures
,
trees
1900
x5351
1894B
Two Out of Three
constructive algorithms
1000
x14233
1893D
Colorful Constructive
constructive algorithms
,
data structures
,
greedy
2600
x789
1893B
Neutral Tonality
constructive algorithms
,
greedy
,
sortings
,
two pointers
1700
x7766
1891C
Smilo and Monsters
binary search
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x10645
1891A
Sorting with Twos
constructive algorithms
,
sortings
800
x18070
1890B
Qingshan Loves Strings
constructive algorithms
,
implementation
800
x16362
1890A
Doremy's Paint 3
constructive algorithms
800
x19497
1889B
Doremy's Connecting Plan
constructive algorithms
,
greedy
,
math
,
sortings
1700
x6497
1889A
Qingshan Loves Strings 2
constructive algorithms
,
greedy
,
implementation
1300
x11643
1887F
Minimum Segments
constructive algorithms
3400
x107
1887E
Good Colorings
binary search
,
constructive algorithms
,
graphs
,
interactive
3100
x320
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1513
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1285
1886A
Sum of Three
brute force
,
constructive algorithms
,
math
800
x24068
1882E2
Two Permutations (Hard Version)
constructive algorithms
3100
x260
1882E1
Two Permutations (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
number theory
2400
x929
1882B
Sets and Union
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1300
x13913
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