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Before contest
Codeforces Round 941 (Div. 1)
2 days
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Before contest
Codeforces Round 941 (Div. 2)
2 days
Register now »
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hashing
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bitmasks
brute force
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combinatorics
constructive algorithms
data structures
dfs and similar
divide and conquer
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geometry
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graphs
greedy
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interactive
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Problems
#
Name
1081H
Palindromic Magic
data structures
,
hashing
,
strings
3500
x97
1621I
Two Sequences
data structures
,
hashing
,
string suffix structures
3500
x108
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x147
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x215
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x136
1610G
AmShZ Wins a Bet
data structures
,
greedy
,
hashing
3300
x368
1340F
Nastya and CBS
brute force
,
data structures
,
hashing
3300
x469
1598G
The Sum of Good Numbers
hashing
,
math
,
string suffix structures
,
strings
3200
x323
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x346
613E
Puzzle Lover
dp
,
hashing
,
strings
3200
x453
1476G
Minimum Difference
data structures
,
hashing
,
sortings
,
two pointers
3100
x525
1569F
Palindromic Hamiltonian Path
brute force
,
dfs and similar
,
dp
,
graphs
,
hashing
3000
x226
1743G
Antifibonacci Cut
bitmasks
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
hashing
,
math
3000
x244
1909G
Pumping Lemma
hashing
,
strings
3000
x318
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x400
1801E
Gasoline prices
data structures
,
divide and conquer
,
dsu
,
hashing
,
trees
3000
x432
1535F
String Distance
binary search
,
brute force
,
data structures
,
hashing
,
implementation
,
strings
3000
x437
504E
Misha and LCP on Tree
binary search
,
dfs and similar
,
hashing
,
string suffix structures
,
trees
3000
x859
718D
Andrew and Chemistry
dp
,
hashing
,
trees
2900
x382
763D
Timofey and a flat tree
data structures
,
graphs
,
hashing
,
shortest paths
,
trees
2900
x514
1622F
Quadratic Set
constructive algorithms
,
hashing
,
math
,
number theory
2900
x584
1913F
Palindromic Problem
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2800
x286
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x319
1393E1
Twilight and Ancient Scroll (easier version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x368
196D
The Next Good String
data structures
,
greedy
,
hashing
,
strings
2800
x503
1286C2
Madhouse (Hard version)
brute force
,
constructive algorithms
,
hashing
,
interactive
,
math
2800
x606
319D
Have You Ever Heard About the Word?
greedy
,
hashing
,
string suffix structures
,
strings
2800
x606
30E
Tricky and Clever Password
binary search
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
strings
2800
x672
1654F
Minimal String Xoration
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
hashing
,
sortings
,
strings
2800
x1049
1746F
Kazaee
data structures
,
hashing
,
probabilities
2800
x1495
690F2
Tree of Life (medium)
constructive algorithms
,
hashing
,
trees
2700
x78
1156G
Optimizer
graphs
,
greedy
,
hashing
,
implementation
2700
x120
1599F
Mars
hashing
2700
x302
1867F
Most Different Tree
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
,
hashing
2700
x399
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x510
524F
And Yet Another Bracket Sequence
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
2700
x521
407D
Largest Submatrix 3
dp
,
hashing
2700
x539
961F
k-substrings
binary search
,
hashing
,
string suffix structures
2700
x648
213E
Two Permutations
data structures
,
hashing
,
strings
2700
x763
1207G
Indie Album
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
2700
x946
1553G
Common Divisor Graph
brute force
,
constructive algorithms
,
dsu
,
graphs
,
hashing
,
math
,
number theory
2700
x970
1641D
Two Arrays
bitmasks
,
brute force
,
combinatorics
,
greedy
,
hashing
,
math
,
two pointers
2700
x1040
452F
Permutation
data structures
,
divide and conquer
,
hashing
2700
x1362
1634F
Fibonacci Additions
brute force
,
data structures
,
hashing
,
implementation
,
math
2700
x1524
1906B
Button Pressing
bitmasks
,
constructive algorithms
,
hashing
2600
x453
542D
Superhero's Job
dfs and similar
,
dp
,
hashing
,
math
,
number theory
2600
x494
1569E
Playoff Restoration
bitmasks
,
brute force
,
hashing
,
implementation
,
meet-in-the-middle
2600
x783
1466G
Song of the Sirens
combinatorics
,
divide and conquer
,
hashing
,
math
,
string suffix structures
,
strings
2600
x848
1051E
Vasya and Big Integers
binary search
,
data structures
,
dp
,
hashing
,
strings
2600
x866
1827C
Palindrome Partition
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
strings
2600
x1129
650D
Zip-line
binary search
,
data structures
,
dp
,
hashing
2600
x1185
1223F
Stack Exterminable Arrays
data structures
,
divide and conquer
,
dp
,
hashing
2600
x1940
119D
String Transformation
hashing
,
strings
2500
x473
444D
DZY Loves Strings
binary search
,
hashing
,
strings
,
two pointers
2500
x748
607C
Marbles
hashing
,
strings
2500
x777
778C
Peterson Polyglot
brute force
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2500
x849
1771F
Hossam and Range Minimum Query
binary search
,
bitmasks
,
data structures
,
hashing
,
probabilities
,
strings
,
trees
2500
x954
1658E
Gojou and Matrix Game
data structures
,
dp
,
games
,
hashing
,
implementation
,
math
,
number theory
,
sortings
2500
x1001
1320D
Reachable Strings
data structures
,
hashing
,
strings
2500
x1204
1418G
Three Occurrences
data structures
,
divide and conquer
,
hashing
,
two pointers
2500
x1453
1175F
The Number of Subpermutations
brute force
,
data structures
,
divide and conquer
,
hashing
,
math
2500
x1540
963D
Frequency of String
hashing
,
string suffix structures
,
strings
2500
x1797
580E
Kefa and Watch
data structures
,
hashing
,
strings
2500
x1934
350D
Looking for Owls
binary search
,
data structures
,
geometry
,
hashing
,
sortings
2400
x254
847L
Berland SU Computer Network
constructive algorithms
,
dfs and similar
,
graphs
,
hashing
,
trees
2400
x314
534E
Berland Local Positioning System
constructive algorithms
,
greedy
,
hashing
,
implementation
2400
x341
534F
Simplified Nonogram
bitmasks
,
dp
,
hashing
,
meet-in-the-middle
2400
x438
1045B
Space Isaac
hashing
,
number theory
2400
x487
28D
Don't fear, DravDe is kind
binary search
,
data structures
,
dp
,
hashing
2400
x582
1780G
Delicious Dessert
binary search
,
dsu
,
hashing
,
math
,
number theory
,
string suffix structures
2400
x665
1166F
Vicky's Delivery Service
data structures
,
dsu
,
graphs
,
hashing
2400
x685
822E
Liar
binary search
,
dp
,
hashing
,
string suffix structures
2400
x749
794D
Labelling Cities
dfs and similar
,
graphs
,
hashing
2400
x756
1182D
Complete Mirror
constructive algorithms
,
dfs and similar
,
dp
,
hashing
,
implementation
,
trees
2400
x800
1017E
The Supersonic Rocket
geometry
,
hashing
,
strings
2400
x807
533F
Encoding
hashing
,
string suffix structures
,
strings
2400
x861
1252F
Regular Forestation
hashing
,
trees
2400
x866
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x896
1794E
Labeling the Tree with Distances
data structures
,
dp
,
greedy
,
hashing
,
implementation
,
trees
2400
x1003
601D
Acyclic Organic Compounds
data structures
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2400
x1088
825F
String Compression
dp
,
hashing
,
string suffix structures
,
strings
2400
x1314
869E
The Untended Antiquity
data structures
,
hashing
2400
x1465
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
2400
x1512
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1559
1494E
A-Z Graph
constructive algorithms
,
data structures
,
graphs
,
hashing
2400
x1650
710F
String Set Queries
brute force
,
data structures
,
hashing
,
interactive
,
string suffix structures
,
strings
2400
x1665
467D
Fedor and Essay
dfs and similar
,
dp
,
graphs
,
hashing
,
strings
2400
x1761
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1849
1257F
Make Them Similar
bitmasks
,
brute force
,
hashing
,
meet-in-the-middle
2400
x1926
212B
Polycarpus is Looking for Good Substrings
bitmasks
,
hashing
,
implementation
2300
x321
856B
Similar Words
dp
,
hashing
,
strings
,
trees
2300
x475
727E
Games on a CD
data structures
,
hashing
,
string suffix structures
,
strings
2300
x1112
898F
Restoring the Expression
brute force
,
hashing
,
math
2300
x1121
1914G2
Light Bulbs (Hard Version)
combinatorics
,
data structures
,
dfs and similar
,
dp
,
graphs
,
hashing
2300
x1207
425D
Sereja and Squares
binary search
,
data structures
,
hashing
2300
x1386
877F
Ann and Books
data structures
,
flows
,
hashing
2300
x1603
985F
Isomorphic Strings
hashing
,
strings
2300
x1694
1394B
Boboniu Walks on Graph
brute force
,
dfs and similar
,
graphs
,
hashing
2300
x1783
1322C
Instant Noodles
graphs
,
hashing
,
math
,
number theory
2300
x2091
1476E
Pattern Matching
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
sortings
,
strings
2300
x2238
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