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Please read
the new rule regarding the restriction on the use of AI tools
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→ Pay attention
Before contest
Codeforces Round 975 (Div. 1)
3 days
Before contest
Codeforces Round 975 (Div. 2)
3 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
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Status
Standings
Custom test
Problems
#
Name
2004D
Colored Portals
binary search
,
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
1600
x9878
1996E
Decode
combinatorics
,
data structures
,
implementation
,
math
1600
x8987
1994C
Hungry Games
binary search
,
dp
,
two pointers
1600
x10112
1985G
D-Function
combinatorics
,
math
,
number theory
1600
x8929
1980E
Permutation of Rows and Columns
constructive algorithms
,
data structures
,
greedy
,
hashing
,
implementation
,
math
,
matrices
,
sortings
1600
x10091
1978D
Elections
data structures
,
greedy
,
implementation
,
math
1600
x10823
1976C
Job Interview
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1600
x10004
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x9612
1968E
Cells Arrangement
constructive algorithms
1600
x10110
1958D
Staircase
*special problem
1600
x492
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
1600
x9395
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x12610
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x10632
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x9487
1938H
Pho Restaurant
1600
x2111
1932E
Final Countdown
implementation
,
math
,
number theory
1600
x7991
1928C
Physical Education Lesson
brute force
,
math
,
number theory
1600
x8388
1921E
Eat the Chip
brute force
,
games
,
greedy
,
math
1600
x9683
1920C
Partitioning the Array
brute force
,
math
,
number theory
1600
x13318
1917C
Watering an Array
brute force
,
greedy
,
implementation
,
math
1600
x10305
1910C
Poisonous Swamp
*special problem
,
*special problem
,
implementation
,
implementation
1600
x625
1910B
Security Guard
*special problem
,
greedy
1600
x668
1907E
Good Triples
brute force
,
combinatorics
,
number theory
1600
x10091
1904D1
Set To Max (Easy Version)
brute force
,
constructive algorithms
,
greedy
1600
x6615
1899F
Alex's whims
constructive algorithms
,
graphs
,
greedy
,
shortest paths
,
trees
1600
x7530
1886C
Decreasing String
implementation
,
strings
1600
x11401
1878D
Reverse Madness
data structures
,
greedy
1600
x8270
1875D
Jellyfish and Mex
dp
1600
x8584
1862E
Kolya and Movie Theatre
constructive algorithms
,
data structures
,
greedy
1600
x10648
1861C
Queries for the Array
data structures
,
dfs and similar
,
implementation
,
strings
,
trees
1600
x10064
1857F
Sum and Product
binary search
,
data structures
,
math
1600
x11448
1856C
To Become Max
binary search
,
brute force
,
data structures
,
dp
1600
x12253
1849C
Binary String Copying
binary search
,
brute force
,
data structures
,
hashing
,
strings
1600
x10470
1843E
Tracking Segments
binary search
,
brute force
,
data structures
,
two pointers
1600
x12247
1840E
Character Blocking
data structures
,
hashing
,
implementation
1600
x8005
1833E
Round Dance
dfs and similar
,
dsu
,
graphs
,
shortest paths
1600
x11659
1829G
Hits Different
data structures
,
dp
,
implementation
,
math
1600
x10360
1822E
Making Anti-Palindromes
greedy
,
math
,
strings
1600
x10394
1811D
Umka and a Long Flight
constructive algorithms
,
implementation
,
math
1600
x7465
1806C
Sequence Master
brute force
,
constructive algorithms
,
math
1600
x7580
1801A
The Very Beautiful Blanket
bitmasks
,
constructive algorithms
1600
x8536
1798D
Shocking Arrangement
constructive algorithms
,
greedy
,
math
1600
x9796
1797C
Li Hua and Chess
constructive algorithms
,
greedy
,
interactive
1600
x7607
1796C
Maximum Set
binary search
,
math
1600
x10372
1795D
Triangle Coloring
combinatorics
,
math
1600
x9088
1787C
Remove the Bracket
dp
,
greedy
,
math
1600
x7050
1781C
Equal Frequencies
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
,
strings
1600
x7564
1779C
Least Prefix Sum
data structures
,
greedy
1600
x12353
1778C
Flexible String
bitmasks
,
brute force
,
strings
1600
x8182
1775C
Interesting Sequence
bitmasks
,
math
1600
x10397
1774D
Same Count One
brute force
,
constructive algorithms
,
greedy
,
implementation
,
two pointers
1600
x7833
1771C
Hossam and Trainees
greedy
,
math
,
number theory
1600
x9639
1766D
Lucky Chains
math
,
number theory
1600
x8863
1753B
Factorial Divisibility
math
,
number theory
1600
x12713
1748C
Zero-Sum Prefixes
brute force
,
data structures
,
dp
,
greedy
,
implementation
1600
x11068
1741E
Sending a Sequence Over the Network
dp
1600
x12151
1730B
Meeting on the Line
binary search
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
1600
x12596
1722E
Counting Rectangles
brute force
,
data structures
,
dp
,
implementation
1600
x10760
1714D
Color with Occurrences
brute force
,
data structures
,
dp
,
greedy
,
strings
1600
x9047
1707A
Doremy's IQ
binary search
,
constructive algorithms
,
greedy
,
implementation
1600
x13518
1703G
Good Key, Bad Key
bitmasks
,
brute force
,
dp
,
greedy
,
math
1600
x10601
1702E
Split Into Two Sets
dfs and similar
,
dsu
,
graphs
1600
x13240
1698D
Fixed Point Guessing
binary search
,
constructive algorithms
,
interactive
1600
x9255
1689C
Infected Tree
dfs and similar
,
dp
,
trees
1600
x11173
1687A
The Enchanted Forest
brute force
,
greedy
1600
x10348
1680C
Binary String
binary search
,
greedy
,
strings
,
two pointers
1600
x9897
1677A
Tokitsukaze and Strange Inequality
brute force
,
data structures
,
dp
1600
x8407
1671D
Insert a Progression
brute force
,
constructive algorithms
,
greedy
1600
x7632
1665C
Tree Infection
binary search
,
greedy
,
sortings
,
trees
1600
x8347
1660E
Matrix and Shifts
brute force
,
constructive algorithms
,
greedy
,
implementation
1600
x7285
1660D
Maximum Product Strikes Back
brute force
,
implementation
,
math
,
two pointers
1600
x8636
1658D1
388535 (Easy Version)
bitmasks
,
math
1600
x9045
1633D
Make Them Equal
dp
,
greedy
1600
x13992
1632C
Strange Test
binary search
,
bitmasks
,
brute force
,
dp
,
math
1600
x12699
1623C
Balanced Stone Heaps
binary search
,
greedy
1600
x12087
1622C
Set or Decrease
binary search
,
brute force
,
greedy
,
sortings
1600
x13035
1615C
Menorah
brute force
,
graphs
,
greedy
,
math
1600
x8358
1612D
X-Magic Pair
math
,
number theory
1600
x9124
1610C
Keshi Is Throwing a Party
binary search
,
greedy
1600
x11513
1609D
Social Network
dsu
,
graphs
,
greedy
,
implementation
,
trees
1600
x7285
1607E
Robot on the Board 1
implementation
1600
x9302
1603B
Moderate Modular Mode
constructive algorithms
,
math
,
number theory
1600
x13511
1593E
Gardener and Tree
brute force
,
data structures
,
dfs and similar
,
greedy
,
implementation
,
trees
1600
x12349
1582D
Vupsen, Pupsen and 0
constructive algorithms
,
math
1600
x10482
1567C
Carrying Conundrum
bitmasks
,
combinatorics
,
dp
,
math
1600
x12156
1566D2
Seating Arrangements (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1600
x7840
1555D
Say No to Palindromes
brute force
,
constructive algorithms
,
dp
,
strings
1600
x12337
1542C
Strange Function
math
,
number theory
1600
x14148
1539D
PriceFixed
binary search
,
greedy
,
implementation
,
sortings
,
two pointers
1600
x11620
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x12895
1530D
Secret Santa
constructive algorithms
,
flows
,
graphs
,
greedy
,
math
1600
x9172
1528A
Parsa's Humongous Tree
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
trees
1600
x14644
1527C
Sequence Pair Weight
hashing
,
implementation
,
math
1600
x13502
1526C2
Potions (Hard Version)
data structures
,
greedy
1600
x22506
1523C
Compression and Expansion
brute force
,
data structures
,
greedy
,
implementation
,
trees
1600
x8743
1520F1
Guess the K-th Zero (Easy version)
binary search
,
interactive
1600
x11673
1519D
Maximum Sum of Products
brute force
,
dp
,
implementation
,
math
,
two pointers
1600
x15186
1514C
Product 1 Modulo N
greedy
,
number theory
1600
x15043
1513C
Add One
dp
,
matrices
1600
x13956
1512E
Permutation by Sum
brute force
,
greedy
,
math
1600
x10441
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