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Codeforces Round (Div. 3)
7 days
→ Filter Problems
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
1985H2
Maximize the Largest Component (Hard Version)
data structures
,
dfs and similar
,
dp
,
dsu
,
implementation
x833
1985H1
Maximize the Largest Component (Easy Version)
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
x3385
1985D
Manhattan Circle
implementation
,
math
x26039
1985A
Creating Words
implementation
,
strings
x37271
1984G
Magic Trick II
constructive algorithms
,
implementation
,
sortings
3200
x118
1984D
''a'' String Problem
brute force
,
hashing
,
implementation
,
math
,
string suffix structures
,
strings
2000
x2330
1984B
Large Addition
implementation
,
math
1100
x13761
1981C
Turtle and an Incomplete Sequence
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
1800
x3820
1980E
Permutation of Rows and Columns
constructive algorithms
,
data structures
,
greedy
,
hashing
,
implementation
,
math
,
matrices
,
sortings
1600
x7908
1980D
GCD-sequence
greedy
,
implementation
,
math
,
number theory
1400
x11027
1979E
Manhattan Triangle
binary search
,
constructive algorithms
,
data structures
,
geometry
,
implementation
,
two pointers
2400
x959
1979A
Guess the Maximum
brute force
,
greedy
,
implementation
800
x24480
1978E
Computing Machine
brute force
,
dp
,
greedy
,
implementation
x944
1978D
Elections
data structures
,
greedy
,
implementation
x3790
1976D
Invertible Bracket Sequences
binary search
,
combinatorics
,
data structures
,
divide and conquer
,
implementation
,
two pointers
2000
x3166
1976C
Job Interview
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1600
x8161
1976B
Increase/Decrease/Copy
greedy
,
implementation
1100
x18544
1976A
Verify Password
implementation
,
sortings
,
strings
800
x24035
1975E
Chain Queries
binary search
,
data structures
,
dfs and similar
,
implementation
,
trees
2100
x1765
1975A
Bazoka and Mocha's Array
brute force
,
greedy
,
implementation
,
sortings
800
x16399
1974F
Cutting Game
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x2913
1974D
Ingenuity-2
constructive algorithms
,
greedy
,
implementation
1400
x12323
1974B
Symmetric Encoding
implementation
,
sortings
,
strings
800
x27106
1973F
Maximum GCD Sum Queries
bitmasks
,
brute force
,
dp
,
implementation
,
number theory
3100
x158
1973C
Cat, Fox and Double Maximum
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1700
x6978
1973A
Chess For Three
brute force
,
dp
,
implementation
,
math
900
x21014
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x8237
1971D
Binary Cut
dp
,
greedy
,
implementation
,
sortings
,
strings
1100
x22283
1971C
Clock and Strings
implementation
900
x27867
1971B
Different String
implementation
,
strings
800
x31614
1971A
My First Sorting Problem
implementation
,
sortings
800
x38177
1970F3
Playing Quidditch (Hard)
implementation
2300
x292
1970F2
Playing Quidditch (Medium)
implementation
2300
x283
1970F1
Playing Quidditch (Easy)
implementation
2300
x353
1970A1
Balanced Shuffle (Easy)
implementation
,
sortings
1000
x3229
1969F
Card Pairing
dp
,
greedy
,
hashing
,
implementation
3000
x166
1969C
Minimizing the Sum
dp
,
implementation
1700
x7026
1969A
Two Friends
constructive algorithms
,
implementation
,
math
800
x17872
1967F
Next and Prev
brute force
,
data structures
,
implementation
3200
x46
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x517
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x10549
1966B
Rectangle Filling
constructive algorithms
,
implementation
1100
x13094
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x16175
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x728
1956E1
Nene vs. Monsters (Easy Version)
brute force
,
implementation
,
math
2500
x1308
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3449
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x3823
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x7640
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x18987
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x25151
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x1929
1954B
Make It Ugly
implementation
,
math
1200
x16605
1952J
Help, what does it mean to be "Based"
brute force
,
constructive algorithms
,
expression parsing
,
implementation
,
sortings
x713
1952H
Palindrome
implementation
,
strings
x368
1952D
Are You a Procrastinator?
implementation
x4287
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x3213
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3768
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x8077
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x12830
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x21297
1950C
Clock Conversion
implementation
,
math
800
x36536
1950B
Upscaling
implementation
800
x34900
1950A
Stair, Peak, or Neither?
implementation
800
x46288
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
2600
x329
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x2716
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
1100
x21151
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x4229
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x9576
1946A
Median of an Array
greedy
,
implementation
,
sortings
800
x24483
1945G
Cook and Porridge
binary search
,
constructive algorithms
,
data structures
,
implementation
2500
x661
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3461
1942F
Farmer John's Favorite Function
brute force
,
data structures
,
implementation
,
math
2700
x603
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2537
1941D
Rudolf and the Ball Game
dfs and similar
,
dp
,
implementation
1200
x17147
1940B
Three Arrays
*special problem
,
constructive algorithms
,
implementation
,
sortings
x178
1937B
Binary Path
dp
,
greedy
,
implementation
1300
x13648
1937A
Shuffle Party
implementation
,
math
800
x22023
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x1150
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2545
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x405
1935D
Exam in MAC
binary search
,
combinatorics
,
implementation
,
math
1800
x7563
1933E
Turtle vs. Rabbit Race: Optimal Trainings
binary search
,
implementation
,
math
,
ternary search
1500
x10119
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x21145
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x30669
1932E
Final Countdown
implementation
,
math
,
number theory
1600
x7225
1932D
Card Game
greedy
,
implementation
1400
x10349
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x14291
1932A
Thorns and Coins
dp
,
greedy
,
implementation
800
x27564
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2440
1928F
Digital Patterns
combinatorics
,
data structures
,
implementation
,
math
2900
x219
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x3949
1926G
Vlad and Trouble at MIT
dfs and similar
,
dp
,
flows
,
graphs
,
greedy
,
implementation
,
trees
1900
x3108
1926F
Vlad and Avoiding X
bitmasks
,
brute force
,
dfs and similar
,
dp
,
implementation
2200
x1549
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x10650
1926C
Vlad and a Sum of Sum of Digits
dp
,
implementation
1200
x24183
1926B
Vlad and Shapes
geometry
,
implementation
800
x30626
1926A
Vlad and the Best of Five
implementation
800
x43786
1924B
Space Harbour
data structures
,
implementation
,
math
,
sortings
2100
x2332
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x343
1923B
Monsters Attack!
dp
,
greedy
,
implementation
1100
x16588
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