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Codeforces Round 950 (Div. 3)
20:20:04
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Difficulty:
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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
1166F
Vicky's Delivery Service
data structures
,
dsu
,
graphs
,
hashing
2400
x687
1156G
Optimizer
graphs
,
greedy
,
hashing
,
implementation
2700
x121
1137B
Camp Schedule
greedy
,
hashing
,
strings
1600
x5922
1133D
Zero Quantity Maximization
hashing
,
math
,
number theory
1500
x11042
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x899
1109B
Sasha and One More Name
constructive algorithms
,
hashing
,
strings
1800
x4275
1081H
Palindromic Magic
data structures
,
hashing
,
strings
3500
x100
1056E
Check Transcription
brute force
,
data structures
,
hashing
,
strings
2100
x1994
1051E
Vasya and Big Integers
binary search
,
data structures
,
dp
,
hashing
,
strings
2600
x900
1045I
Palindrome Pairs
hashing
,
strings
1600
x4168
1045B
Space Isaac
hashing
,
number theory
2400
x499
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x217
1017E
The Supersonic Rocket
geometry
,
hashing
,
strings
2400
x815
1003F
Abbreviation
dp
,
hashing
,
strings
2200
x1152
985F
Isomorphic Strings
hashing
,
strings
2300
x1712
963D
Frequency of String
hashing
,
string suffix structures
,
strings
2500
x1826
961F
k-substrings
binary search
,
hashing
,
string suffix structures
2700
x660
958A2
Death Stars (medium)
hashing
,
strings
2000
x879
903E
Swapping Characters
brute force
,
hashing
,
implementation
,
strings
2200
x1312
898F
Restoring the Expression
brute force
,
hashing
,
math
2300
x1128
877F
Ann and Books
data structures
,
flows
,
hashing
2300
x1652
869E
The Untended Antiquity
data structures
,
hashing
2400
x1478
856B
Similar Words
dp
,
hashing
,
strings
,
trees
2300
x481
847L
Berland SU Computer Network
constructive algorithms
,
dfs and similar
,
graphs
,
hashing
,
trees
2400
x316
835D
Palindromic characteristics
brute force
,
dp
,
hashing
,
strings
1900
x3957
825F
String Compression
dp
,
hashing
,
string suffix structures
,
strings
2400
x1350
822E
Liar
binary search
,
dp
,
hashing
,
string suffix structures
2400
x770
794D
Labelling Cities
dfs and similar
,
graphs
,
hashing
2400
x765
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x138
778C
Peterson Polyglot
brute force
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2500
x867
763D
Timofey and a flat tree
data structures
,
graphs
,
hashing
,
shortest paths
,
trees
2900
x516
762C
Two strings
binary search
,
hashing
,
strings
,
two pointers
2100
x2380
757C
Felicity is Coming!
data structures
,
hashing
,
sortings
,
strings
1900
x2312
733D
Kostya the Sculptor
data structures
,
hashing
1600
x4139
727E
Games on a CD
data structures
,
hashing
,
string suffix structures
,
strings
2300
x1129
724C
Ray Tracing
greedy
,
hashing
,
implementation
,
math
,
number theory
,
sortings
1800
x2117
718D
Andrew and Chemistry
dp
,
hashing
,
trees
2900
x386
710F
String Set Queries
brute force
,
data structures
,
hashing
,
interactive
,
string suffix structures
,
strings
2400
x1699
690F2
Tree of Life (medium)
constructive algorithms
,
hashing
,
trees
2700
x80
650D
Zip-line
binary search
,
data structures
,
dp
,
hashing
2600
x1201
639C
Bear and Polynomials
hashing
,
implementation
,
math
2200
x1189
633D
Fibonacci-ish
brute force
,
dp
,
hashing
,
implementation
,
math
2000
x2572
633C
Spy Syndrome 2
data structures
,
dp
,
hashing
,
implementation
,
sortings
,
string suffix structures
,
strings
1900
x2679
631D
Messenger
data structures
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2003
613E
Puzzle Lover
dp
,
hashing
,
strings
3200
x456
611D
New Year and Ancient Prophecy
dp
,
hashing
,
strings
2000
x2522
607C
Marbles
hashing
,
strings
2500
x780
601D
Acyclic Organic Compounds
data structures
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2400
x1094
580E
Kefa and Watch
data structures
,
hashing
,
strings
2500
x1962
574B
Bear and Three Musketeers
brute force
,
dfs and similar
,
graphs
,
hashing
1500
x7641
567E
President and Roads
dfs and similar
,
graphs
,
hashing
,
shortest paths
2200
x1664
559B
Equivalent Strings
divide and conquer
,
hashing
,
sortings
,
strings
1700
x10410
542D
Superhero's Job
dfs and similar
,
dp
,
hashing
,
math
,
number theory
2600
x499
535D
Tavas and Malekas
greedy
,
hashing
,
string suffix structures
,
strings
1900
x3798
534F
Simplified Nonogram
bitmasks
,
dp
,
hashing
,
meet-in-the-middle
2400
x445
534E
Berland Local Positioning System
constructive algorithms
,
greedy
,
hashing
,
implementation
2400
x344
533F
Encoding
hashing
,
string suffix structures
,
strings
2400
x868
533E
Correcting Mistakes
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x2226
526D
Om Nom and Necklace
hashing
,
string suffix structures
,
strings
2200
x2103
525A
Vitaliy and Pie
greedy
,
hashing
,
strings
1100
x13983
524F
And Yet Another Bracket Sequence
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
2700
x522
514C
Watto and Mechanism
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2000
x6549
504E
Misha and LCP on Tree
binary search
,
dfs and similar
,
hashing
,
string suffix structures
,
trees
3000
x876
486E
LIS of Sequence
data structures
,
dp
,
greedy
,
hashing
,
math
2200
x2131
486B
OR in Matrix
greedy
,
hashing
,
implementation
1300
x17020
467D
Fedor and Essay
dfs and similar
,
dp
,
graphs
,
hashing
,
strings
2400
x1772
463C
Gargari and Bishops
greedy
,
hashing
,
implementation
1900
x8444
452F
Permutation
data structures
,
divide and conquer
,
hashing
2700
x1386
444D
DZY Loves Strings
binary search
,
hashing
,
strings
,
two pointers
2500
x756
425D
Sereja and Squares
binary search
,
data structures
,
hashing
2300
x1405
407D
Largest Submatrix 3
dp
,
hashing
2700
x542
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x401
350D
Looking for Owls
binary search
,
data structures
,
geometry
,
hashing
,
sortings
2400
x257
319D
Have You Ever Heard About the Word?
greedy
,
hashing
,
string suffix structures
,
strings
2800
x616
316G1
Good Substrings
hashing
,
strings
1700
x931
291E
Tree-String Problem
*special problem
,
dfs and similar
,
hashing
,
strings
2000
x1280
245H
Queries for Number of Palindromes
dp
,
hashing
,
strings
1800
x6028
242C
King's Path
dfs and similar
,
graphs
,
hashing
,
shortest paths
1800
x8111
228C
Fractal Detector
dp
,
hashing
2000
x445
213E
Two Permutations
data structures
,
hashing
,
strings
2700
x773
212B
Polycarpus is Looking for Good Substrings
bitmasks
,
hashing
,
implementation
2300
x323
196D
The Next Good String
data structures
,
greedy
,
hashing
,
strings
2800
x522
190E
Counter Attack
data structures
,
dsu
,
graphs
,
hashing
,
sortings
2100
x1445
182D
Common Divisors
brute force
,
hashing
,
implementation
,
math
,
strings
1400
x7841
154C
Double Profiles
graphs
,
hashing
,
sortings
2300
x2698
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2473
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x18048
119D
String Transformation
hashing
,
strings
2500
x477
113B
Petr#
brute force
,
data structures
,
hashing
,
strings
2000
x2736
82B
Sets
constructive algorithms
,
hashing
,
implementation
1700
x2019
79C
Beaver
data structures
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x1733
65D
Harry Potter and the Sorting Hat
brute force
,
dfs and similar
,
hashing
2200
x421
54B
Cutting Jigsaw Puzzle
hashing
,
implementation
1800
x740
39J
Spelling Check
hashing
,
implementation
,
strings
1500
x2838
30E
Tricky and Clever Password
binary search
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
strings
2800
x679
28D
Don't fear, DravDe is kind
binary search
,
data structures
,
dp
,
hashing
2400
x591
25E
Test
hashing
,
strings
2200
x2222
19C
Deletion of Repeats
greedy
,
hashing
,
string suffix structures
2200
x1051
7D
Palindrome Degree
hashing
,
strings
2200
x3529
4C
Registration System
data structures
,
hashing
,
implementation
1300
x78017
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