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Codeforces Round (Div. 2)
5 days
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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
communication
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
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Status
Standings
Custom test
Problems
#
Name
505A
Mr. Kitayuta's Gift
brute force
,
implementation
,
strings
1100
x6996
501B
Misha and Changing Handles
data structures
,
dsu
,
strings
1100
x20287
499B
Lecture
implementation
,
strings
1000
x46177
494B
Obsessive String
dp
,
strings
2000
x3303
490C
Hacking Cypher
brute force
,
math
,
number theory
,
strings
1700
x9558
477D
Dreamoon and Binary
dp
,
strings
2700
x626
476E
Dreamoon and Strings
dp
,
strings
2200
x2179
471D
MUH and Cube Walls
string suffix structures
,
strings
1800
x11250
467D
Fedor and Essay
dfs and similar
,
dp
,
graphs
,
hashing
,
strings
2400
x2119
464A
No to Palindromes!
greedy
,
strings
1700
x6283
461E
Appleman and a Game
binary search
,
shortest paths
,
strings
3000
x758
455B
A Lot of Games
dfs and similar
,
dp
,
games
,
implementation
,
strings
,
trees
1900
x7332
452E
Three strings
data structures
,
dsu
,
string suffix structures
,
strings
2400
x1248
452A
Eevee
brute force
,
implementation
,
strings
1000
x8639
448B
Suffix Structures
implementation
,
strings
1400
x17781
444D
DZY Loves Strings
binary search
,
hashing
,
strings
,
two pointers
2500
x910
443B
Kolya and Tandem Repeat
brute force
,
implementation
,
strings
1500
x4319
432D
Prefixes and Suffixes
dp
,
string suffix structures
,
strings
,
two pointers
2000
x13157
427D
Match & Catch
dp
,
string suffix structures
,
strings
2200
x2809
412C
Pattern
implementation
,
strings
1200
x4296
386C
Diverse Substrings
dp
,
strings
,
two pointers
2000
x989
385B
Bear and Strings
brute force
,
greedy
,
implementation
,
math
,
strings
1200
x11022
358B
Dima and Text Messages
brute force
,
strings
1500
x3924
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x605
346B
Lucky Common Subsequence
dp
,
strings
2000
x4494
345G
Suffix Subgroup
*special problem
,
strings
2200
x105
339A
Helpful Maths
greedy
,
implementation
,
sortings
,
strings
800
x294107
319D
Have You Ever Heard About the Word?
greedy
,
hashing
,
string suffix structures
,
strings
2800
x808
318B
Strings of Power
implementation
,
strings
,
two pointers
1300
x8426
316G1
Good Substrings
hashing
,
strings
1700
x1107
314B
Sereja and Periods
binary search
,
dfs and similar
,
strings
2000
x1659
312A
Whose sentence is it?
implementation
,
strings
1100
x5465
291E
Tree-String Problem
*special problem
,
dfs and similar
,
hashing
,
strings
2000
x1669
291B
Command Line Arguments
*special problem
,
implementation
,
strings
1300
x3110
281A
Word Capitalization
implementation
,
strings
800
x288290
278B
New Problem
brute force
,
strings
1500
x3667
271D
Good Substrings
data structures
,
strings
1800
x15031
269E
String Theory
geometry
,
math
,
strings
3100
x122
260B
Ancient Prophesy
brute force
,
implementation
,
strings
1600
x4114
259A
Little Elephant and Chess
brute force
,
strings
1000
x10231
254C
Anagram
greedy
,
strings
1800
x1620
250B
Restoring IPv6
implementation
,
strings
1500
x2289
245H
Queries for Number of Palindromes
dp
,
hashing
,
strings
1800
x9890
245F
Log Stream Analysis
binary search
,
brute force
,
implementation
,
strings
2000
x1004
245B
Internet Address
implementation
,
strings
1100
x5575
236A
Boy or Girl
brute force
,
implementation
,
strings
800
x301110
235C
Cyclical Quest
data structures
,
string suffix structures
,
strings
2700
x2651
223B
Two Strings
data structures
,
dp
,
strings
1900
x2050
219A
k-String
implementation
,
strings
1000
x33438
213E
Two Permutations
data structures
,
hashing
,
strings
2700
x1043
208A
Dubstep
strings
900
x109259
202A
LLPS
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
strings
800
x20402
196D
The Next Good String
data structures
,
greedy
,
hashing
,
strings
2800
x672
196A
Lexicographically Maximum Subsequence
greedy
,
strings
1100
x5926
186A
Comparing Strings
implementation
,
strings
1100
x18829
182D
Common Divisors
brute force
,
hashing
,
implementation
,
math
,
strings
1400
x9552
180D
Name
greedy
,
strings
1900
x828
178F2
Representative Sampling
dp
,
sortings
,
strings
2200
x400
177G2
Fibonacci Strings
matrices
,
strings
2600
x290
177G1
Fibonacci Strings
strings
2400
x253
168B
Wizards and Minimal Spell
implementation
,
strings
1700
x1323
165C
Another Problem on Strings
binary search
,
brute force
,
dp
,
math
,
strings
,
two pointers
1600
x14219
163E
e-Government
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2800
x2413
159D
Palindrome pairs
*special problem
,
brute force
,
dp
,
strings
1500
x4771
159C
String Manipulation 1.0
*special problem
,
binary search
,
brute force
,
data structures
,
strings
1400
x3242
151B
Phone Numbers
implementation
,
strings
1200
x6994
150D
Mission Impassable
dp
,
strings
2600
x797
149E
Martian Strings
string suffix structures
,
strings
2300
x2647
147A
Punctuation
implementation
,
strings
1300
x4342
144C
Anagram Search
implementation
,
strings
1500
x4294
143B
Help Kingdom of Far Far Away 2
implementation
,
strings
1200
x5396
141A
Amusing Joke
implementation
,
sortings
,
strings
800
x106509
137E
Last Chance
data structures
,
implementation
,
strings
2000
x1430
137D
Palindromes
dp
,
strings
1900
x1813
131A
cAPS lOCK
implementation
,
strings
1000
x105551
130B
Gnikool Ssalg
*special problem
,
implementation
,
strings
1400
x571
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x3007
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x26867
123A
Prime Permutation
implementation
,
number theory
,
strings
1300
x4128
121B
Lucky Transformation
strings
1500
x2877
119D
String Transformation
hashing
,
strings
2500
x774
118C
Fancy Number
brute force
,
greedy
,
sortings
,
strings
1900
x3056
118A
String Task
implementation
,
strings
1000
x242836
113B
Petr#
brute force
,
data structures
,
hashing
,
strings
2000
x3390
113A
Grammar Lessons
implementation
,
strings
1600
x2636
112A
Petya and Strings
implementation
,
strings
800
x306188
110B
Lucky String
constructive algorithms
,
strings
1100
x11190
108A
Palindromic Times
implementation
,
strings
1000
x10546
100D
World of Mouth
*special problem
,
strings
1500
x375
99A
Help Far Away Kingdom
strings
800
x8025
96A
Football
implementation
,
strings
900
x204013
95A
Hockey
implementation
,
strings
1600
x1886
94A
Restoring Password
implementation
,
strings
900
x12724
91A
Newspaper Headline
greedy
,
strings
1500
x4050
90B
African Crossword
implementation
,
strings
1100
x5825
87B
Vasya and Types
implementation
,
strings
1800
x1280
81B
Sequence Formatting
implementation
,
strings
1700
x2174
79C
Beaver
data structures
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x2177
78A
Haiku
implementation
,
strings
800
x15843
75B
Facetook Priority Wall
expression parsing
,
implementation
,
strings
1500
x3682
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