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Before contest
Codeforces Round #792 (Div. 1 + Div. 2)
34:10:44
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Difficulty:
—
strings
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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Custom test
Problems
#
Name
1680C
Binary String
binary search
,
greedy
,
strings
,
two pointers
1600
x4697
1679E
Typical Party in Dorm
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
strings
2400
x473
1676C
Most Similar Words
brute force
,
greedy
,
implementation
,
implementation
,
math
,
strings
800
x17922
1675E
Replace With the Previous, Minimize
dsu
,
greedy
,
strings
1500
x5395
1674C
Infinite Replacement
combinatorics
,
implementation
,
strings
1000
x14399
1673B
A Perfectly Balanced String?
brute force
,
greedy
,
strings
1100
x9933
1673A
Subtle Substring Subtraction
games
,
greedy
,
strings
800
x14650
1670B
Dorms War
brute force
,
implementation
,
strings
1100
x8595
1669E
2-Letter Strings
data structures
,
math
,
strings
1200
x10031
1663G
Six Characters
constructive algorithms
,
strings
x114
1663F
In Every Generation...
strings
x221
1662D
Evolution of Weasels
greedy
,
implementation
,
strings
x669
1662B
Toys
greedy
,
strings
x87
1660F2
Promising String (hard version)
data structures
,
implementation
,
math
,
strings
2100
x1771
1660F1
Promising String (easy version)
brute force
,
implementation
,
math
,
strings
1700
x5001
1660C
Get an Even String
dp
,
greedy
,
strings
1300
x12723
1659B
Bit Flipping
bitmasks
,
constructive algorithms
,
greedy
,
strings
1300
x7150
1654F
Minimal String Xoration
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
hashing
,
sortings
,
strings
2800
x597
1654B
Prefix Removals
strings
800
x13669
1650A
Deletions of Two Adjacent Letters
implementation
,
strings
800
x26135
1635D
Infinite Set
bitmasks
,
dp
,
math
,
matrices
,
number theory
,
strings
1800
x4305
1634A
Reverse and Concatenate
greedy
,
strings
800
x20887
1628B
Peculiar Movie Preferences
greedy
,
strings
1700
x8618
1626B
Minor Reduction
greedy
,
strings
1100
x17683
1624E
Masha-forgetful
brute force
,
constructive algorithms
,
dp
,
hashing
,
implementation
,
strings
2000
x2922
1624D
Palindromes Coloring
binary search
,
greedy
,
sortings
,
strings
1400
x11554
1623E
Middle Duplication
data structures
,
dfs and similar
,
greedy
,
strings
,
trees
2500
x828
1619A
Square String?
implementation
,
strings
800
x29973
1618F
Reverse
bitmasks
,
constructive algorithms
,
dfs and similar
,
implementation
,
math
,
strings
2000
x3076
1617A
Forbidden Subsequence
constructive algorithms
,
greedy
,
sortings
,
strings
800
x14338
1616E
Lexicographically Small Enough
brute force
,
data structures
,
greedy
,
strings
2200
x1937
1616B
Mirror in the String
greedy
,
strings
1100
x15351
1609B
William the Vigilant
implementation
,
strings
1100
x9867
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x87
1607A
Linear Keyboard
implementation
,
strings
800
x27945
1606A
AB Balance
strings
900
x17142
1605C
Dominant Character
brute force
,
greedy
,
implementation
,
strings
1400
x11569
1598G
The Sum of Good Numbers
hashing
,
math
,
string suffix structures
,
strings
3200
x172
1594C
Make Them Equal
brute force
,
greedy
,
math
,
strings
1200
x12851
1584F
Strange LCS
bitmasks
,
dp
,
graphs
,
greedy
,
strings
2600
x604
1582C
Grandma Capa Knits a Scarf
brute force
,
data structures
,
greedy
,
strings
,
two pointers
1200
x10659
1579A
Casimir's String Solitaire
math
,
strings
800
x29742
1578H
Higher Order Functions
implementation
,
strings
1700
x1612
1575H
Holiday Wall Ornaments
dp
,
strings
2200
x399
1575A
Another Sorting Problem
data structures
,
sortings
,
strings
1100
x2833
1567A
Domino Disaster
implementation
,
strings
800
x24664
1562E
Rescue Niwen!
dp
,
greedy
,
string suffix structures
,
strings
2500
x985
1560E
Polycarp and String Transformation
binary search
,
implementation
,
sortings
,
strings
1800
x6191
1560D
Make a Power of Two
greedy
,
math
,
strings
1300
x14076
1555D
Say No to Palindromes
brute force
,
constructive algorithms
,
dp
,
strings
1600
x8860
1554D
Diane
constructive algorithms
,
greedy
,
strings
1800
x7032
1553D
Backspace
dp
,
greedy
,
strings
,
two pointers
1500
x10162
1553B
Reverse String
brute force
,
dp
,
hashing
,
implementation
,
strings
1300
x11246
1552A
Subsequence Permutation
sortings
,
strings
800
x20550
1551C
Interesting Story
greedy
,
sortings
,
strings
1500
x10087
1551B1
Wonderful Coloring - 1
greedy
,
strings
800
x24603
1550E
Stringforces
binary search
,
bitmasks
,
brute force
,
dp
,
strings
,
two pointers
2500
x1100
1547B
Alphabetical Strings
greedy
,
implementation
,
strings
800
x22512
1539B
Love Song
dp
,
implementation
,
strings
800
x19706
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2310
1537E2
Erase and Extend (Hard Version)
binary search
,
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
,
two pointers
2200
x3843
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x9365
1536B
Prinzessin der Verurteilung
brute force
,
constructive algorithms
,
strings
1200
x14788
1535F
String Distance
binary search
,
brute force
,
data structures
,
hashing
,
implementation
,
strings
3000
x292
1535C
Unstable String
binary search
,
dp
,
greedy
,
implementation
,
strings
,
two pointers
1400
x12590
1532F
Prefixes and Suffixes
*special problem
,
strings
x208
1530E
Minimax
constructive algorithms
,
greedy
,
strings
2100
x2465
1526D
Kill Anton
brute force
,
constructive algorithms
,
data structures
,
math
,
strings
2200
x2047
1512C
A-B Palindrome
constructive algorithms
,
implementation
,
strings
1200
x15553
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x260
1511D
Min Cost String
brute force
,
constructive algorithms
,
graphs
,
greedy
,
strings
1600
x8772
1508A
Binary Literature
constructive algorithms
,
greedy
,
implementation
,
strings
,
two pointers
1900
x5120
1506G
Maximize the Remaining String
brute force
,
data structures
,
dp
,
greedy
,
strings
2000
x3342
1506C
Double-ended Strings
brute force
,
implementation
,
strings
1000
x19214
1504A
Déjà Vu
constructive algorithms
,
strings
800
x18992
1499E
Chaotic Merge
combinatorics
,
dp
,
math
,
strings
2400
x1103
1496A
Split it!
brute force
,
constructive algorithms
,
greedy
,
strings
900
x17517
1493E
Enormous XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
,
strings
,
two pointers
2600
x681
1493C
K-beautiful Strings
binary search
,
brute force
,
constructive algorithms
,
greedy
,
strings
2000
x3858
1481A
Space Navigation
greedy
,
strings
800
x22248
1480A
Yet Another String Game
games
,
greedy
,
strings
800
x22424
1476E
Pattern Matching
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
sortings
,
strings
2300
x1825
1473D
Program
data structures
,
dp
,
implementation
,
strings
1700
x7481
1473B
String LCM
brute force
,
math
,
number theory
,
strings
1000
x22817
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1553
1466G
Song of the Sirens
combinatorics
,
divide and conquer
,
hashing
,
math
,
string suffix structures
,
strings
2600
x701
1466C
Canine poetry
dp
,
greedy
,
strings
1300
x14961
1462B
Last Year's Substring
dp
,
implementation
,
strings
800
x23064
1451C
String Equality
dp
,
greedy
,
hashing
,
implementation
,
strings
1400
x12620
1451B
Non-Substring Subsequence
dp
,
greedy
,
implementation
,
strings
900
x17029
1446B
Catching Cheaters
dp
,
strings
1800
x6210
1437G
Death DBMS
data structures
,
string suffix structures
,
strings
,
trees
2600
x652
1431I
Cyclic Shifts
*special problem
,
strings
2900
x30
1430E
String Reversal
data structures
,
greedy
,
strings
1900
x4935
1428C
ABBB
brute force
,
data structures
,
greedy
,
strings
1100
x15692
1426F
Number of Subsequences
combinatorics
,
dp
,
strings
2000
x3989
1422E
Minlexes
dp
,
greedy
,
implementation
,
strings
2700
x596
1421C
Palindromifier
constructive algorithms
,
strings
1400
x10718
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x3241
1411E
Poman Numbers
bitmasks
,
greedy
,
math
,
strings
2300
x1368
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