Enter
|
Register
Home
Top
Catalog
Contests
Gym
Problemset
Groups
Rating
Edu
API
Calendar
Help
→ Pay attention
Before contest
Codeforces Round 941 (Div. 1)
24:16:00
Register now »
*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
24:16:00
Register now »
*has extra registration
→ Filter Problems
Difficulty:
—
hashing
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
Add tag
Main
acmsguru
|
Problems
Submit
Status
Standings
Custom test
Problems
#
Name
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
x196
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
x251
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x2850
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3259
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3135
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x319
1914G2
Light Bulbs (Hard Version)
combinatorics
,
data structures
,
dfs and similar
,
dp
,
graphs
,
hashing
2300
x1207
1913F
Palindromic Problem
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2800
x286
1909G
Pumping Lemma
hashing
,
strings
3000
x318
1906B
Button Pressing
bitmasks
,
constructive algorithms
,
hashing
2600
x453
1899D
Yarik and Musical Notes
hashing
,
math
,
number theory
1300
x12098
1895C
Torn Lucky Ticket
brute force
,
dp
,
hashing
,
implementation
,
math
1400
x10033
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1559
1867F
Most Different Tree
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
,
hashing
2700
x399
1849C
Binary String Copying
binary search
,
brute force
,
data structures
,
hashing
,
strings
1600
x9774
1840E
Character Blocking
data structures
,
hashing
,
implementation
1600
x7484
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
2400
x1512
1827C
Palindrome Partition
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
strings
2600
x1132
1801E
Gasoline prices
data structures
,
divide and conquer
,
dsu
,
hashing
,
trees
3000
x432
1800G
Symmetree
dfs and similar
,
hashing
,
implementation
,
trees
2200
x1918
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3671
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x21591
1794E
Labeling the Tree with Distances
data structures
,
dp
,
greedy
,
hashing
,
implementation
,
trees
2400
x1003
1792D
Fixed Prefix Permutations
binary search
,
bitmasks
,
data structures
,
hashing
,
math
,
sortings
1700
x5858
1780G
Delicious Dessert
binary search
,
dsu
,
hashing
,
math
,
number theory
,
string suffix structures
2400
x665
1773B
BinCoin
binary search
,
divide and conquer
,
hashing
,
implementation
,
probabilities
,
trees
2200
x729
1771F
Hossam and Range Minimum Query
binary search
,
bitmasks
,
data structures
,
hashing
,
probabilities
,
strings
,
trees
2500
x957
1746F
Kazaee
data structures
,
hashing
,
probabilities
2800
x1498
1743G
Antifibonacci Cut
bitmasks
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
hashing
,
math
3000
x244
1735D
Meta-set
brute force
,
combinatorics
,
data structures
,
hashing
,
math
1700
x5262
1731C
Even Subarrays
bitmasks
,
brute force
,
hashing
,
math
,
number theory
1700
x8891
1729G
Cut Substrings
combinatorics
,
dp
,
hashing
,
strings
,
two pointers
2100
x2050
1729F
Kirei and the Linear Function
hashing
,
math
1900
x3976
1721E
Prefix Function Queries
dfs and similar
,
dp
,
hashing
,
string suffix structures
,
strings
,
trees
2200
x1805
1704D
Magical Array
constructive algorithms
,
hashing
,
implementation
,
math
1900
x4834
1681D
Required Length
brute force
,
dfs and similar
,
dp
,
hashing
,
shortest paths
1700
x9249
1671E
Preorder
combinatorics
,
divide and conquer
,
dp
,
dsu
,
hashing
,
sortings
,
trees
2100
x2639
1658E
Gojou and Matrix Game
data structures
,
dp
,
games
,
hashing
,
implementation
,
math
,
number theory
,
sortings
2500
x1001
1654F
Minimal String Xoration
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
hashing
,
sortings
,
strings
2800
x1049
1650C
Weight of the System of Nested Segments
greedy
,
hashing
,
implementation
,
sortings
1200
x16339
1641D
Two Arrays
bitmasks
,
brute force
,
combinatorics
,
greedy
,
hashing
,
math
,
two pointers
2700
x1040
1634F
Fibonacci Additions
brute force
,
data structures
,
hashing
,
implementation
,
math
2700
x1524
1624E
Masha-forgetful
brute force
,
constructive algorithms
,
dp
,
hashing
,
implementation
,
strings
2000
x3925
1622F
Quadratic Set
constructive algorithms
,
hashing
,
math
,
number theory
2900
x585
1621I
Two Sequences
data structures
,
hashing
,
string suffix structures
3500
x108
1610G
AmShZ Wins a Bet
data structures
,
greedy
,
hashing
3300
x368
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x147
1599F
Mars
hashing
2700
x302
1598G
The Sum of Good Numbers
hashing
,
math
,
string suffix structures
,
strings
3200
x323
1574D
The Strongest Build
binary search
,
brute force
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
hashing
,
implementation
2000
x4343
1569F
Palindromic Hamiltonian Path
brute force
,
dfs and similar
,
dp
,
graphs
,
hashing
3000
x226
1569E
Playoff Restoration
bitmasks
,
brute force
,
hashing
,
implementation
,
meet-in-the-middle
2600
x783
1553G
Common Divisor Graph
brute force
,
constructive algorithms
,
dsu
,
graphs
,
hashing
,
math
,
number theory
2700
x970
1553B
Reverse String
brute force
,
dp
,
hashing
,
implementation
,
strings
1300
x13790
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2798
1537E2
Erase and Extend (Hard Version)
binary search
,
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
,
two pointers
2200
x4965
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x12217
1536C
Diluc and Kaeya
data structures
,
dp
,
hashing
,
number theory
1500
x13516
1535F
String Distance
binary search
,
brute force
,
data structures
,
hashing
,
implementation
,
strings
3000
x437
1533D
String Searching
*special problem
,
hashing
x434
1527C
Sequence Pair Weight
hashing
,
implementation
,
math
1600
x13085
1520D
Same Differences
data structures
,
hashing
,
math
1200
x42387
1500A
Going Home
brute force
,
hashing
,
implementation
,
math
1800
x8527
1494E
A-Z Graph
constructive algorithms
,
data structures
,
graphs
,
hashing
2400
x1652
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x4732
1476G
Minimum Difference
data structures
,
hashing
,
sortings
,
two pointers
3100
x526
1476E
Pattern Matching
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
sortings
,
strings
2300
x2239
1470B
Strange Definition
bitmasks
,
graphs
,
hashing
,
math
,
number theory
1900
x6139
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1849
1468F
Full Turn
geometry
,
hashing
,
number theory
1700
x3585
1466G
Song of the Sirens
combinatorics
,
divide and conquer
,
hashing
,
math
,
string suffix structures
,
strings
2600
x848
1451C
String Equality
dp
,
greedy
,
hashing
,
implementation
,
strings
1400
x15190
1418G
Three Occurrences
data structures
,
divide and conquer
,
hashing
,
two pointers
2500
x1454
1394B
Boboniu Walks on Graph
brute force
,
dfs and similar
,
graphs
,
hashing
2300
x1786
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x346
1393E1
Twilight and Ancient Scroll (easier version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x368
1360F
Spy-string
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
hashing
,
strings
1700
x11822
1340F
Nastya and CBS
brute force
,
data structures
,
hashing
3300
x469
1326D2
Prefix-Suffix Palindrome (Hard version)
binary search
,
greedy
,
hashing
,
string suffix structures
,
strings
1800
x9503
1326D1
Prefix-Suffix Palindrome (Easy version)
hashing
,
string suffix structures
,
strings
1500
x11583
1322C
Instant Noodles
graphs
,
hashing
,
math
,
number theory
2300
x2102
1320D
Reachable Strings
data structures
,
hashing
,
strings
2500
x1204
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x512
1286C2
Madhouse (Hard version)
brute force
,
constructive algorithms
,
hashing
,
interactive
,
math
2800
x607
1284D
New Year and Conference
binary search
,
data structures
,
hashing
,
sortings
2100
x2911
1277D
Let's Play the Words?
data structures
,
hashing
,
implementation
,
math
1900
x2961
1257F
Make Them Similar
bitmasks
,
brute force
,
hashing
,
meet-in-the-middle
2400
x1927
1252F
Regular Forestation
hashing
,
trees
2400
x868
1228D
Complete Tripartite
brute force
,
constructive algorithms
,
graphs
,
hashing
,
implementation
1900
x4963
1225D
Power Products
hashing
,
math
,
number theory
1800
x7365
1223F
Stack Exterminable Arrays
data structures
,
divide and conquer
,
dp
,
hashing
2600
x1942
1214D
Treasure Island
dfs and similar
,
dp
,
flows
,
hashing
1900
x4928
1207G
Indie Album
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
2700
x946
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x6845
1182D
Complete Mirror
constructive algorithms
,
dfs and similar
,
dp
,
hashing
,
implementation
,
trees
2400
x800
1175F
The Number of Subpermutations
brute force
,
data structures
,
divide and conquer
,
hashing
,
math
2500
x1544
1166F
Vicky's Delivery Service
data structures
,
dsu
,
graphs
,
hashing
2400
x685
1156G
Optimizer
graphs
,
greedy
,
hashing
,
implementation
2700
x120
1137B
Camp Schedule
greedy
,
hashing
,
strings
1600
x5811
1133D
Zero Quantity Maximization
hashing
,
math
,
number theory
1500
x10875
←
1
2
→
User lists
Name