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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
x843
1985H1
Maximize the Largest Component (Easy Version)
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
x3409
1985G
D-Function
combinatorics
,
math
,
number theory
x5791
1985F
Final Boss
binary search
,
data structures
x9962
1985E
Secret Box
brute force
,
combinatorics
,
math
x14507
1985D
Manhattan Circle
implementation
,
math
x26110
1985C
Good Prefixes
greedy
x23024
1985B
Maximum Multiple Sum
brute force
,
math
,
number theory
x33907
1985A
Creating Words
implementation
,
strings
x37389
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
x620
1984E
Shuffle
dp
,
greedy
,
trees
2400
x970
1984D
''a'' String Problem
brute force
,
hashing
,
implementation
,
math
,
string suffix structures
,
strings
2000
x2339
1984C2
Magnitude (Hard Version)
combinatorics
,
dp
,
greedy
,
math
1700
x5391
1984C1
Magnitude (Easy Version)
dp
,
greedy
,
math
1300
x11832
1984B
Large Addition
implementation
,
math
1100
x13825
1984A
Strange Splitting
constructive algorithms
800
x16796
1981F
Turtle and Paths on a Tree
data structures
,
dp
,
trees
3000
x160
1981E
Turtle and Intersected Segments
data structures
,
dsu
,
graphs
,
greedy
2600
x535
1981D
Turtle and Multiplication
constructive algorithms
,
dfs and similar
,
graphs
,
number theory
2400
x1105
1981C
Turtle and an Incomplete Sequence
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
1800
x3829
1981B
Turtle and an Infinite Sequence
bitmasks
,
math
1300
x10665
1981A
Turtle and Piggy Are Playing a Game
brute force
,
greedy
,
math
800
x18366
1980G
Yasya and the Mysterious Tree
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
strings
,
trees
2300
x811
1980F2
Field Division (hard version)
math
,
sortings
2400
x663
1980F1
Field Division (easy version)
data structures
,
math
,
sortings
1900
x2769
1980E
Permutation of Rows and Columns
constructive algorithms
,
data structures
,
greedy
,
hashing
,
implementation
,
math
,
matrices
,
sortings
1600
x7933
1980D
GCD-sequence
greedy
,
implementation
,
math
,
number theory
1400
x11053
1980C
Sofia and the Lost Operations
constructive algorithms
,
greedy
1300
x15014
1980B
Choosing Cubes
sortings
,
sortings
800
x29327
1980A
Problem Generator
math
800
x33948
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
x962
1979D
Fixing a Binary String
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
1800
x4963
1979C
Earning on Bets
binary search
,
combinatorics
,
constructive algorithms
,
number theory
1200
x14953
1979B
XOR Sequences
bitmasks
,
greedy
1000
x18753
1979A
Guess the Maximum
brute force
,
greedy
,
implementation
800
x24516
1978F
Large Graph
brute force
,
dfs and similar
,
dsu
,
graphs
,
number theory
x314
1978E
Computing Machine
data structures
,
dp
,
greedy
,
implementation
x1221
1978D
Elections
greedy
,
implementation
,
math
x4636
1978C
Manhattan Permutations
constructive algorithms
,
greedy
,
implementation
,
math
x7325
1978B
New Bakery
greedy
,
math
,
ternary search
x13313
1978A
Alice and Books
constructive algorithms
,
sortings
x15014
1977E
Tensor
constructive algorithms
,
graphs
,
interactive
2600
x475
1977D
XORificator
bitmasks
,
brute force
,
greedy
,
hashing
2300
x1387
1977C
Nikita and LCM
brute force
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
sortings
1900
x5369
1977B
Binary Colouring
bitmasks
,
constructive algorithms
,
greedy
,
math
1100
x15143
1977A
Little Nikita
math
800
x26258
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
x722
1976D
Invertible Bracket Sequences
binary search
,
combinatorics
,
data structures
,
divide and conquer
,
implementation
,
two pointers
2000
x3171
1976C
Job Interview
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1600
x8169
1976B
Increase/Decrease/Copy
greedy
,
implementation
1100
x18560
1976A
Verify Password
implementation
,
sortings
,
strings
800
x24056
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
x1766
1975D
Paint the Tree
brute force
,
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1700
x4726
1975C
Chamo and Mocha's Array
binary search
,
brute force
,
greedy
1200
x11897
1975B
378QAQ and Mocha's Array
brute force
,
greedy
,
math
,
sortings
1000
x14701
1975A
Bazoka and Mocha's Array
brute force
,
greedy
,
implementation
,
sortings
800
x16410
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
x2914
1974E
Money Buys Happiness
dp
1800
x6308
1974D
Ingenuity-2
constructive algorithms
,
greedy
,
implementation
1400
x12337
1974C
Beautiful Triple Pairs
combinatorics
,
data structures
1400
x13248
1974B
Symmetric Encoding
implementation
,
sortings
,
strings
800
x27113
1974A
Phone Desktop
greedy
,
math
800
x29521
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
x6982
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
1300
x11990
1973A
Chess For Three
brute force
,
dp
,
implementation
,
math
900
x21033
1972B
Coin Games
games
900
x18516
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x20425
1971H
±1
2-sat
,
dfs and similar
,
graphs
2100
x1365
1971G
XOUR
data structures
,
dsu
,
sortings
1700
x7727
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x8240
1971E
Find the Car
binary search
,
math
,
sortings
1500
x11653
1971D
Binary Cut
dp
,
greedy
,
implementation
,
sortings
,
strings
1100
x22292
1971C
Clock and Strings
implementation
900
x27883
1971B
Different String
implementation
,
strings
800
x31628
1971A
My First Sorting Problem
implementation
,
sortings
800
x38197
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
2400
x244
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
x858
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
x1010
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