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Before contest
Codeforces Round (Div. 3)
7 days
→ Filter Problems
Difficulty:
—
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
x838
1985H1
Maximize the Largest Component (Easy Version)
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
x3396
1985G
D-Function
combinatorics
,
math
,
number theory
x5775
1985F
Final Boss
binary search
,
data structures
x9926
1985E
Secret Box
brute force
,
combinatorics
,
math
x14469
1985D
Manhattan Circle
implementation
,
math
x26072
1985C
Good Prefixes
greedy
x22972
1985B
Maximum Multiple Sum
brute force
,
math
,
number theory
x33852
1985A
Creating Words
implementation
,
strings
x37327
1984H
Tower Capturing
combinatorics
,
dp
,
geometry
3300
x96
1984G
Magic Trick II
constructive algorithms
,
implementation
,
sortings
3200
x118
1984F
Reconstruction
brute force
,
dp
,
math
2500
x619
1984E
Shuffle
dp
,
greedy
,
trees
2400
x967
1984D
''a'' String Problem
brute force
,
hashing
,
implementation
,
math
,
string suffix structures
,
strings
2000
x2333
1984C2
Magnitude (Hard Version)
combinatorics
,
dp
,
greedy
,
math
1700
x5382
1984C1
Magnitude (Easy Version)
dp
,
greedy
,
math
1300
x11803
1984B
Large Addition
implementation
,
math
1100
x13786
1984A
Strange Splitting
constructive algorithms
800
x16766
1981F
Turtle and Paths on a Tree
data structures
,
dp
,
trees
3000
x160
1981E
Turtle and Intersected Segments
data structures
,
dsu
,
graphs
,
greedy
2600
x534
1981D
Turtle and Multiplication
constructive algorithms
,
dfs and similar
,
graphs
,
number theory
2400
x1104
1981C
Turtle and an Incomplete Sequence
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
1800
x3825
1981B
Turtle and an Infinite Sequence
bitmasks
,
math
1300
x10660
1981A
Turtle and Piggy Are Playing a Game
brute force
,
greedy
,
math
800
x18356
1980G
Yasya and the Mysterious Tree
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
strings
,
trees
2300
x808
1980F2
Field Division (hard version)
math
,
sortings
2400
x663
1980F1
Field Division (easy version)
data structures
,
math
,
sortings
1900
x2766
1980E
Permutation of Rows and Columns
constructive algorithms
,
data structures
,
greedy
,
hashing
,
implementation
,
math
,
matrices
,
sortings
1600
x7925
1980D
GCD-sequence
greedy
,
implementation
,
math
,
number theory
1400
x11041
1980C
Sofia and the Lost Operations
constructive algorithms
,
greedy
1300
x15003
1980B
Choosing Cubes
sortings
,
sortings
800
x29298
1980A
Problem Generator
math
800
x33919
1979F
Kostyanych's Theorem
brute force
,
constructive algorithms
,
graphs
,
interactive
2900
x178
1979E
Manhattan Triangle
binary search
,
constructive algorithms
,
data structures
,
geometry
,
implementation
,
two pointers
2400
x961
1979D
Fixing a Binary String
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
1800
x4949
1979C
Earning on Bets
binary search
,
combinatorics
,
constructive algorithms
,
number theory
1200
x14938
1979B
XOR Sequences
bitmasks
,
greedy
1000
x18740
1979A
Guess the Maximum
brute force
,
greedy
,
implementation
800
x24496
1978F
Large Graph
brute force
,
dfs and similar
,
dsu
,
graphs
,
number theory
x282
1978E
Computing Machine
brute force
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
strings
x1100
1978D
Elections
data structures
,
greedy
,
implementation
x4211
1978C
Manhattan Permutations
constructive algorithms
,
greedy
,
math
x6789
1978B
New Bakery
math
x12658
1978A
Alice and Books
sortings
x14287
1977E
Tensor
constructive algorithms
,
graphs
,
interactive
2600
x474
1977D
XORificator
bitmasks
,
brute force
,
greedy
,
hashing
2300
x1386
1977C
Nikita and LCM
brute force
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
sortings
1900
x5368
1977B
Binary Colouring
bitmasks
,
constructive algorithms
,
greedy
,
math
1100
x15138
1977A
Little Nikita
math
800
x26243
1976F
Remove Bridges
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
2800
x375
1976E
Splittable Permutations
combinatorics
,
data structures
,
dfs and similar
,
greedy
,
math
,
trees
2500
x721
1976D
Invertible Bracket Sequences
binary search
,
combinatorics
,
data structures
,
divide and conquer
,
implementation
,
two pointers
2000
x3170
1976C
Job Interview
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1600
x8165
1976B
Increase/Decrease/Copy
greedy
,
implementation
1100
x18548
1976A
Verify Password
implementation
,
sortings
,
strings
800
x24044
1975I
Mind Bloom
dp
3500
x42
1975H
378QAQ and Core
greedy
,
strings
3500
x61
1975G
Zimpha Fan Club
fft
,
greedy
,
math
,
strings
3000
x175
1975F
Set
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
math
2600
x617
1975E
Chain Queries
binary search
,
data structures
,
dfs and similar
,
implementation
,
trees
2100
x1765
1975D
Paint the Tree
brute force
,
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1700
x4724
1975C
Chamo and Mocha's Array
binary search
,
brute force
,
greedy
1200
x11892
1975B
378QAQ and Mocha's Array
brute force
,
greedy
,
math
,
sortings
1000
x14698
1975A
Bazoka and Mocha's Array
brute force
,
greedy
,
implementation
,
sortings
800
x16403
1974G
Money Buys Less Happiness Now
data structures
,
greedy
,
sortings
2000
x3446
1974F
Cutting Game
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x2913
1974E
Money Buys Happiness
dp
1800
x6306
1974D
Ingenuity-2
constructive algorithms
,
greedy
,
implementation
1400
x12327
1974C
Beautiful Triple Pairs
combinatorics
,
data structures
1400
x13245
1974B
Symmetric Encoding
implementation
,
sortings
,
strings
800
x27107
1974A
Phone Desktop
greedy
,
math
800
x29514
1973F
Maximum GCD Sum Queries
bitmasks
,
brute force
,
dp
,
implementation
,
number theory
3100
x158
1973E
Cat, Fox and Swaps
graphs
,
math
,
sortings
2500
x646
1973D
Cat, Fox and Maximum Array Split
brute force
,
interactive
,
math
2400
x1619
1973C
Cat, Fox and Double Maximum
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1700
x6979
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
1300
x11989
1973A
Chess For Three
brute force
,
dp
,
implementation
,
math
900
x21022
1972B
Coin Games
games
900
x18510
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x20422
1971H
±1
2-sat
,
dfs and similar
,
graphs
2100
x1364
1971G
XOUR
data structures
,
dsu
,
sortings
1700
x7726
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x8239
1971E
Find the Car
binary search
,
math
,
sortings
1500
x11647
1971D
Binary Cut
dp
,
greedy
,
implementation
,
sortings
,
strings
1100
x22285
1971C
Clock and Strings
implementation
900
x27875
1971B
Different String
implementation
,
strings
800
x31621
1971A
My First Sorting Problem
implementation
,
sortings
800
x38182
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
2400
x243
1970G2
Min-Fund Prison (Medium)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
2200
x417
1970G1
Min-Fund Prison (Easy)
dfs and similar
,
trees
1900
x959
1970F3
Playing Quidditch (Hard)
implementation
2300
x292
1970F2
Playing Quidditch (Medium)
implementation
2300
x283
1970F1
Playing Quidditch (Easy)
implementation
2300
x353
1970E3
Trails (Hard)
dp
,
matrices
2200
x472
1970E2
Trails (Medium)
dp
,
matrices
2000
x857
1970E1
Trails (Easy)
dp
1800
x1367
1970D3
Arithmancy (Hard)
interactive
3100
x83
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
2600
x152
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x469
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
1900
x1009
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