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Codeforces Round (Div. 2)
3 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
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
443B
Kolya and Tandem Repeat
brute force
,
implementation
,
strings
1500
x4005
432D
Prefixes and Suffixes
dp
,
string suffix structures
,
strings
,
two pointers
2000
x8542
427D
Match & Catch
dp
,
string suffix structures
,
strings
2200
x2123
412C
Pattern
implementation
,
strings
1200
x3874
386C
Diverse Substrings
dp
,
strings
,
two pointers
2000
x756
385B
Bear and Strings
brute force
,
greedy
,
implementation
,
math
,
strings
1200
x9639
358B
Dima and Text Messages
brute force
,
strings
1500
x3697
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x405
346B
Lucky Common Subsequence
dp
,
strings
2000
x3383
345G
Suffix Subgroup
*special problem
,
strings
2200
x53
339A
Helpful Maths
greedy
,
implementation
,
sortings
,
strings
800
x203589
319D
Have You Ever Heard About the Word?
greedy
,
hashing
,
string suffix structures
,
strings
2800
x621
318B
Strings of Power
implementation
,
strings
,
two pointers
1300
x7427
316G1
Good Substrings
hashing
,
strings
1700
x935
314B
Sereja and Periods
binary search
,
dfs and similar
,
strings
2000
x1457
312A
Whose sentence is it?
implementation
,
strings
1100
x4922
291E
Tree-String Problem
*special problem
,
dfs and similar
,
hashing
,
strings
2000
x1285
291B
Command Line Arguments
*special problem
,
implementation
,
strings
1300
x3019
281A
Word Capitalization
implementation
,
strings
800
x201053
278B
New Problem
brute force
,
strings
1500
x3427
271D
Good Substrings
data structures
,
strings
1800
x10668
269E
String Theory
geometry
,
math
,
strings
3100
x108
260B
Ancient Prophesy
brute force
,
implementation
,
strings
1600
x3759
259A
Little Elephant and Chess
brute force
,
strings
1000
x8986
254C
Anagram
greedy
,
strings
1800
x1476
250B
Restoring IPv6
implementation
,
strings
1500
x1957
245H
Queries for Number of Palindromes
dp
,
hashing
,
strings
1800
x6213
245F
Log Stream Analysis
binary search
,
brute force
,
implementation
,
strings
2000
x871
245B
Internet Address
implementation
,
strings
1100
x5154
236A
Boy or Girl
brute force
,
implementation
,
strings
800
x198830
235C
Cyclical Quest
data structures
,
string suffix structures
,
strings
2700
x2045
223B
Two Strings
data structures
,
dp
,
strings
1900
x1740
219A
k-String
implementation
,
strings
1000
x26698
213E
Two Permutations
data structures
,
hashing
,
strings
2700
x777
208A
Dubstep
strings
900
x85446
202A
LLPS
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
strings
800
x16220
196D
The Next Good String
data structures
,
greedy
,
hashing
,
strings
2800
x523
196A
Lexicographically Maximum Subsequence
greedy
,
strings
1100
x5326
186A
Comparing Strings
implementation
,
strings
1100
x16440
182D
Common Divisors
brute force
,
hashing
,
implementation
,
math
,
strings
1400
x7881
180D
Name
greedy
,
strings
1900
x717
178F2
Representative Sampling
dp
,
sortings
,
strings
2200
x322
177G2
Fibonacci Strings
matrices
,
strings
2600
x176
177G1
Fibonacci Strings
strings
2400
x168
168B
Wizards and Minimal Spell
implementation
,
strings
1700
x1206
165C
Another Problem on Strings
binary search
,
brute force
,
dp
,
math
,
strings
,
two pointers
1600
x12006
163E
e-Government
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2800
x1549
159D
Palindrome pairs
*special problem
,
brute force
,
dp
,
strings
1500
x4279
159C
String Manipulation 1.0
*special problem
,
binary search
,
brute force
,
data structures
,
strings
1400
x2940
151B
Phone Numbers
implementation
,
strings
1200
x6272
150D
Mission Impassable
dp
,
strings
2600
x593
149E
Martian Strings
string suffix structures
,
strings
2300
x2051
147A
Punctuation
implementation
,
strings
1300
x3575
144C
Anagram Search
implementation
,
strings
1500
x3922
143B
Help Kingdom of Far Far Away 2
implementation
,
strings
1200
x4940
141A
Amusing Joke
implementation
,
sortings
,
strings
800
x79724
137E
Last Chance
data structures
,
implementation
,
strings
2000
x1199
137D
Palindromes
dp
,
strings
1900
x1483
131A
cAPS lOCK
implementation
,
strings
1000
x82939
130B
Gnikool Ssalg
*special problem
,
implementation
,
strings
1400
x521
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2481
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x18401
123A
Prime Permutation
implementation
,
number theory
,
strings
1300
x3538
121B
Lucky Transformation
strings
1500
x2544
119D
String Transformation
hashing
,
strings
2500
x479
118C
Fancy Number
brute force
,
greedy
,
sortings
,
strings
1900
x2554
118A
String Task
implementation
,
strings
1000
x185169
113B
Petr#
brute force
,
data structures
,
hashing
,
strings
2000
x2757
113A
Grammar Lessons
implementation
,
strings
1600
x2248
112A
Petya and Strings
implementation
,
strings
800
x214476
110B
Lucky String
constructive algorithms
,
strings
1100
x10052
108A
Palindromic Times
implementation
,
strings
1000
x9258
100D
World of Mouth
*special problem
,
strings
1500
x300
99A
Help Far Away Kingdom
strings
800
x6579
96A
Football
implementation
,
strings
900
x152273
95A
Hockey
implementation
,
strings
1600
x1650
94A
Restoring Password
implementation
,
strings
900
x10284
91A
Newspaper Headline
greedy
,
strings
1500
x3522
90B
African Crossword
implementation
,
strings
1100
x5214
87B
Vasya and Types
implementation
,
strings
1800
x1122
81B
Sequence Formatting
implementation
,
strings
1700
x1920
79C
Beaver
data structures
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x1740
78A
Haiku
implementation
,
strings
800
x12138
75B
Facetook Priority Wall
expression parsing
,
implementation
,
strings
1500
x3244
72E
Ali goes shopping
*special problem
,
brute force
,
strings
1800
x151
71A
Way Too Long Words
strings
800
x363318
70B
Text Messaging
expression parsing
,
greedy
,
strings
1600
x1728
66A
Petya and Java
implementation
,
strings
1300
x6263
63A
Sinking Ship
implementation
,
sortings
,
strings
900
x11037
61B
Hard Work
strings
1300
x3814
59A
Word
implementation
,
strings
800
x166546
58D
Calendar
greedy
,
strings
2000
x715
58A
Chat room
greedy
,
strings
1000
x124860
54D
Writing a Song
brute force
,
dp
,
strings
2100
x520
50B
Choosing Symbol Pairs
strings
1500
x5587
43B
Letter
implementation
,
strings
1100
x16071
43A
Football
strings
1000
x53709
41A
Translation
implementation
,
strings
800
x138503
39J
Spelling Check
hashing
,
implementation
,
strings
1500
x2869
38F
Smart Boy
dp
,
games
,
strings
2100
x380
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