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Codeforces Round 945 (Div. 2)
3 days
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*has extra registration
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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
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Problems
#
Name
4C
Registration System
data structures
,
hashing
,
implementation
1300
x77389
1520D
Same Differences
data structures
,
hashing
,
math
1200
x42774
2A
Winner
hashing
,
implementation
1500
x25093
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x21728
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x17838
486B
OR in Matrix
greedy
,
hashing
,
implementation
1300
x16949
1650C
Weight of the System of Nested Segments
greedy
,
hashing
,
implementation
,
sortings
1200
x16383
1451C
String Equality
dp
,
greedy
,
hashing
,
implementation
,
strings
1400
x15216
525A
Vitaliy and Pie
greedy
,
hashing
,
strings
1100
x13881
1553B
Reverse String
brute force
,
dp
,
hashing
,
implementation
,
strings
1300
x13833
1536C
Diluc and Kaeya
data structures
,
dp
,
hashing
,
number theory
1500
x13574
1527C
Sequence Pair Weight
hashing
,
implementation
,
math
1600
x13122
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x12277
1899D
Yarik and Musical Notes
hashing
,
math
,
number theory
1300
x12235
1360F
Spy-string
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
hashing
,
strings
1700
x11868
1326D1
Prefix-Suffix Palindrome (Easy version)
hashing
,
string suffix structures
,
strings
1500
x11662
1133D
Zero Quantity Maximization
hashing
,
math
,
number theory
1500
x10956
559B
Equivalent Strings
divide and conquer
,
hashing
,
sortings
,
strings
1700
x10373
1895C
Torn Lucky Ticket
brute force
,
dp
,
hashing
,
implementation
,
math
1400
x10118
1849C
Binary String Copying
binary search
,
brute force
,
data structures
,
hashing
,
strings
1600
x9858
1326D2
Prefix-Suffix Palindrome (Hard version)
binary search
,
greedy
,
hashing
,
string suffix structures
,
strings
1800
x9611
1681D
Required Length
brute force
,
dfs and similar
,
dp
,
hashing
,
shortest paths
1700
x9275
1731C
Even Subarrays
bitmasks
,
brute force
,
hashing
,
math
,
number theory
1700
x8964
1500A
Going Home
brute force
,
hashing
,
implementation
,
math
1800
x8554
463C
Gargari and Bishops
greedy
,
hashing
,
implementation
1900
x8377
242C
King's Path
dfs and similar
,
graphs
,
hashing
,
shortest paths
1800
x8056
182D
Common Divisors
brute force
,
hashing
,
implementation
,
math
,
strings
1400
x7823
574B
Bear and Three Musketeers
brute force
,
dfs and similar
,
graphs
,
hashing
1500
x7610
1840E
Character Blocking
data structures
,
hashing
,
implementation
1600
x7553
1225D
Power Products
hashing
,
math
,
number theory
1800
x7402
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x6982
514C
Watto and Mechanism
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2000
x6495
1470B
Strange Definition
bitmasks
,
graphs
,
hashing
,
math
,
number theory
1900
x6153
245H
Queries for Number of Palindromes
dp
,
hashing
,
strings
1800
x5979
1792D
Fixed Prefix Permutations
binary search
,
bitmasks
,
data structures
,
hashing
,
math
,
sortings
1700
x5895
1137B
Camp Schedule
greedy
,
hashing
,
strings
1600
x5883
1735D
Meta-set
brute force
,
combinatorics
,
data structures
,
hashing
,
math
1700
x5284
1537E2
Erase and Extend (Hard Version)
binary search
,
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
,
two pointers
2200
x4988
1228D
Complete Tripartite
brute force
,
constructive algorithms
,
graphs
,
hashing
,
implementation
1900
x4974
1214D
Treasure Island
dfs and similar
,
dp
,
flows
,
hashing
1900
x4943
1704D
Magical Array
constructive algorithms
,
hashing
,
implementation
,
math
1900
x4861
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x4746
1574D
The Strongest Build
binary search
,
brute force
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
hashing
,
implementation
2000
x4355
1109B
Sasha and One More Name
constructive algorithms
,
hashing
,
strings
1800
x4267
733D
Kostya the Sculptor
data structures
,
hashing
1600
x4136
1045I
Palindrome Pairs
hashing
,
strings
1600
x4116
1729F
Kirei and the Linear Function
hashing
,
math
1900
x3998
1624E
Masha-forgetful
brute force
,
constructive algorithms
,
dp
,
hashing
,
implementation
,
strings
2000
x3953
835D
Palindromic characteristics
brute force
,
dp
,
hashing
,
strings
1900
x3908
535D
Tavas and Malekas
greedy
,
hashing
,
string suffix structures
,
strings
1900
x3778
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3697
1468F
Full Turn
geometry
,
hashing
,
number theory
1700
x3591
7D
Palindrome Degree
hashing
,
strings
2200
x3515
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3505
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3307
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x3022
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x3000
1277D
Let's Play the Words?
data structures
,
hashing
,
implementation
,
math
1900
x2963
1284D
New Year and Conference
binary search
,
data structures
,
hashing
,
sortings
2100
x2916
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2806
39J
Spelling Check
hashing
,
implementation
,
strings
1500
x2794
113B
Petr#
brute force
,
data structures
,
hashing
,
strings
2000
x2726
154C
Double Profiles
graphs
,
hashing
,
sortings
2300
x2680
633C
Spy Syndrome 2
data structures
,
dp
,
hashing
,
implementation
,
sortings
,
string suffix structures
,
strings
1900
x2650
1671E
Preorder
combinatorics
,
divide and conquer
,
dp
,
dsu
,
hashing
,
sortings
,
trees
2100
x2647
633D
Fibonacci-ish
brute force
,
dp
,
hashing
,
implementation
,
math
2000
x2564
611D
New Year and Ancient Prophecy
dp
,
hashing
,
strings
2000
x2514
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2463
762C
Two strings
binary search
,
hashing
,
strings
,
two pointers
2100
x2366
757C
Felicity is Coming!
data structures
,
hashing
,
sortings
,
strings
1900
x2308
1476E
Pattern Matching
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
sortings
,
strings
2300
x2246
25E
Test
hashing
,
strings
2200
x2193
533E
Correcting Mistakes
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x2174
1322C
Instant Noodles
graphs
,
hashing
,
math
,
number theory
2300
x2147
724C
Ray Tracing
greedy
,
hashing
,
implementation
,
math
,
number theory
,
sortings
1800
x2113
526D
Om Nom and Necklace
hashing
,
string suffix structures
,
strings
2200
x2098
1729G
Cut Substrings
combinatorics
,
dp
,
hashing
,
strings
,
two pointers
2100
x2062
486E
LIS of Sequence
data structures
,
dp
,
greedy
,
hashing
,
math
2200
x2056
82B
Sets
constructive algorithms
,
hashing
,
implementation
1700
x2017
631D
Messenger
data structures
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x1992
1056E
Check Transcription
brute force
,
data structures
,
hashing
,
strings
2100
x1986
1223F
Stack Exterminable Arrays
data structures
,
divide and conquer
,
dp
,
hashing
2600
x1950
580E
Kefa and Watch
data structures
,
hashing
,
strings
2500
x1947
1257F
Make Them Similar
bitmasks
,
brute force
,
hashing
,
meet-in-the-middle
2400
x1940
1800G
Symmetree
dfs and similar
,
hashing
,
implementation
,
trees
2200
x1935
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1855
1721E
Prefix Function Queries
dfs and similar
,
dp
,
hashing
,
string suffix structures
,
strings
,
trees
2200
x1816
963D
Frequency of String
hashing
,
string suffix structures
,
strings
2500
x1808
1394B
Boboniu Walks on Graph
brute force
,
dfs and similar
,
graphs
,
hashing
2300
x1791
467D
Fedor and Essay
dfs and similar
,
dp
,
graphs
,
hashing
,
strings
2400
x1768
79C
Beaver
data structures
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x1721
985F
Isomorphic Strings
hashing
,
strings
2300
x1707
710F
String Set Queries
brute force
,
data structures
,
hashing
,
interactive
,
string suffix structures
,
strings
2400
x1676
1494E
A-Z Graph
constructive algorithms
,
data structures
,
graphs
,
hashing
2400
x1662
567E
President and Roads
dfs and similar
,
graphs
,
hashing
,
shortest paths
2200
x1645
877F
Ann and Books
data structures
,
flows
,
hashing
2300
x1632
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1580
1175F
The Number of Subpermutations
brute force
,
data structures
,
divide and conquer
,
hashing
,
math
2500
x1559
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
2400
x1529
1634F
Fibonacci Additions
brute force
,
data structures
,
hashing
,
implementation
,
math
2700
x1528
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