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Codeforces Round (Div. 2)
3 days
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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
#
Name
1984G
Magic Trick II
constructive algorithms
,
implementation
,
sortings
3200
x189
1984A
Strange Splitting
constructive algorithms
800
x18611
1981D
Turtle and Multiplication
constructive algorithms
,
dfs and similar
,
graphs
,
number theory
2400
x1259
1981C
Turtle and an Incomplete Sequence
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
1800
x4275
1980E
Permutation of Rows and Columns
constructive algorithms
,
data structures
,
greedy
,
hashing
,
implementation
,
math
,
matrices
,
sortings
1600
x8720
1980C
Sofia and the Lost Operations
constructive algorithms
,
greedy
1300
x16176
1979F
Kostyanych's Theorem
brute force
,
constructive algorithms
,
graphs
,
interactive
2900
x231
1979E
Manhattan Triangle
binary search
,
constructive algorithms
,
data structures
,
geometry
,
implementation
,
two pointers
2400
x1129
1979D
Fixing a Binary String
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
1800
x5487
1979C
Earning on Bets
binary search
,
combinatorics
,
constructive algorithms
,
number theory
1200
x16259
1978C
Manhattan Permutations
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
1300
x12084
1978A
Alice and Books
constructive algorithms
,
greedy
,
sortings
800
x21771
1977E
Tensor
constructive algorithms
,
graphs
,
interactive
2600
x536
1977B
Binary Colouring
bitmasks
,
constructive algorithms
,
greedy
,
math
1100
x15872
1974D
Ingenuity-2
constructive algorithms
,
greedy
,
implementation
1400
x12965
1973C
Cat, Fox and Double Maximum
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1700
x7295
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
2600
x163
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x488
1970B3
Exact Neighbours (Hard)
constructive algorithms
2300
x378
1970B2
Exact Neighbours (Medium)
constructive algorithms
2100
x611
1970B1
Exact Neighbours (Easy)
constructive algorithms
1900
x870
1970A3
Balanced Unshuffle (Hard)
constructive algorithms
,
trees
2400
x382
1970A2
Balanced Unshuffle (Medium)
brute force
,
constructive algorithms
,
trees
2400
x381
1969B
Shifts and Sorting
constructive algorithms
,
greedy
1000
x16949
1969A
Two Friends
constructive algorithms
,
implementation
,
math
800
x18437
1968E
Cells Arrangement
constructive algorithms
1600
x9223
1968C
Assembly via Remainders
constructive algorithms
,
number theory
1000
x22436
1966B
Rectangle Filling
constructive algorithms
,
implementation
1100
x13541
1966A
Card Exchange
constructive algorithms
,
games
,
greedy
800
x16461
1965E
Connected Cubes
constructive algorithms
,
games
3100
x207
1965D
Missing Subarray Sum
constructive algorithms
2900
x316
1965C
Folding Strip
constructive algorithms
,
greedy
,
strings
2300
x1630
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x5859
1958E
Yet Another Permutation Constructive
*special problem
,
constructive algorithms
1900
x220
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x16587
1957A
Stickogon
constructive algorithms
,
greedy
800
x21770
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x305
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3532
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x11776
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x1133
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x25702
1954A
Painting the Ribbon
constructive algorithms
,
greedy
,
math
900
x22222
1952J
Help, what does it mean to be "Based"
brute force
,
constructive algorithms
,
expression parsing
,
implementation
,
sortings
x723
1951I
Growing Trees
binary search
,
constructive algorithms
,
flows
,
graphs
,
greedy
3200
x70
1951F
Inversion Composition
constructive algorithms
,
data structures
,
greedy
2500
x698
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x3281
1951D
Buying Jewels
constructive algorithms
,
greedy
,
math
2000
x5055
1951A
Dual Trigger
constructive algorithms
,
greedy
,
math
900
x18187
1949K
Make Triangle
constructive algorithms
,
math
2800
x263
1949D
Funny or Scary?
constructive algorithms
2600
x327
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x2756
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
1300
x15433
1948A
Special Characters
brute force
,
constructive algorithms
800
x27325
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x4302
1945G
Cook and Porridge
binary search
,
constructive algorithms
,
data structures
,
implementation
2500
x679
1945E
Binary Search
binary search
,
constructive algorithms
,
greedy
1700
x7465
1944B
Equal XOR
bitmasks
,
constructive algorithms
1100
x15220
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2300
x1910
1942B
Bessie and MEX
constructive algorithms
,
math
1100
x13053
1942A
Farmer John's Challenge
constructive algorithms
,
math
800
x16459
1941G
Rudolf and Subway
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2000
x3207
1940D
Almost Certainly
*special problem
,
constructive algorithms
,
data structures
,
sortings
x126
1940B
Three Arrays
*special problem
,
constructive algorithms
,
implementation
,
sortings
x181
1940A
Parallel Universes
*special problem
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
x81
1939B
Evidence Board
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
x214
1939A
Draw Polygon Lines
*special problem
,
constructive algorithms
,
dp
,
geometry
,
interactive
x20
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x6893
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x412
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x7534
1935B
Informatics in MAC
constructive algorithms
1200
x17358
1935A
Entertainment in MAC
constructive algorithms
,
strings
800
x26563
1934E
Weird LCM Operations
brute force
,
constructive algorithms
,
number theory
3000
x200
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x3225
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x6301
1933G
Turtle Magic: Royal Turtle Shell Pattern
bitmasks
,
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
2300
x911
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x18798
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x143
1930C
Lexicographically Largest
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
1700
x6656
1930B
Permutation Printing
brute force
,
constructive algorithms
,
math
1000
x14312
1929C
Sasha and the Casino
binary search
,
brute force
,
constructive algorithms
,
games
,
greedy
,
math
1400
x13860
1929B
Sasha and the Drawing
constructive algorithms
,
greedy
,
math
800
x24385
1929A
Sasha and the Beautiful Array
constructive algorithms
,
greedy
,
math
,
sortings
800
x30073
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1603
1927E
Klever Permutation
constructive algorithms
,
math
,
two pointers
1400
x13051
1927B
Following the String
constructive algorithms
,
greedy
,
strings
900
x31452
1925A
We Got Everything Covered!
constructive algorithms
,
greedy
,
strings
800
x27847
1924F
Anti-Proxy Attendance
constructive algorithms
,
dp
,
interactive
,
ternary search
3500
x139
1924A
Did We Get Everything Covered?
constructive algorithms
,
dp
,
greedy
,
shortest paths
,
strings
1500
x12939
1923D
Slimes
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x6230
1923C
Find B
constructive algorithms
,
greedy
1400
x13931
1922E
Increasing Subsequences
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
math
1800
x7290
1922B
Forming Triangles
combinatorics
,
constructive algorithms
,
math
,
sortings
1200
x19642
1922A
Tricky Template
constructive algorithms
,
implementation
,
strings
800
x26334
1919G
Tree LGM
constructive algorithms
,
divide and conquer
,
games
,
trees
3500
x175
1919E
Counting Prefixes
combinatorics
,
constructive algorithms
,
dp
,
implementation
,
math
2600
x802
1919D
01 Tree
constructive algorithms
,
data structures
,
dsu
,
greedy
,
sortings
,
trees
2100
x3677
1918G
Permutation of Given
constructive algorithms
,
math
2700
x435
1918E
ace5 and Task Order
constructive algorithms
,
divide and conquer
,
implementation
,
interactive
,
probabilities
,
sortings
2200
x1623
1918B
Minimize Inversions
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
900
x22772
1918A
Brick Wall
constructive algorithms
,
greedy
,
implementation
,
math
800
x29329
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