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Educational Codeforces Round 166 (Rated for Div. 2)
27:43:36
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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
358B
Dima and Text Messages
brute force
,
strings
1500
x3685
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x401
346B
Lucky Common Subsequence
dp
,
strings
2000
x3352
345G
Suffix Subgroup
*special problem
,
strings
2200
x53
339A
Helpful Maths
greedy
,
implementation
,
sortings
,
strings
800
x200110
319D
Have You Ever Heard About the Word?
greedy
,
hashing
,
string suffix structures
,
strings
2800
x616
318B
Strings of Power
implementation
,
strings
,
two pointers
1300
x7395
316G1
Good Substrings
hashing
,
strings
1700
x931
314B
Sereja and Periods
binary search
,
dfs and similar
,
strings
2000
x1455
312A
Whose sentence is it?
implementation
,
strings
1100
x4872
291E
Tree-String Problem
*special problem
,
dfs and similar
,
hashing
,
strings
2000
x1279
291B
Command Line Arguments
*special problem
,
implementation
,
strings
1300
x3015
281A
Word Capitalization
implementation
,
strings
800
x197933
278B
New Problem
brute force
,
strings
1500
x3421
271D
Good Substrings
data structures
,
strings
1800
x10406
269E
String Theory
geometry
,
math
,
strings
3100
x107
260B
Ancient Prophesy
brute force
,
implementation
,
strings
1600
x3747
259A
Little Elephant and Chess
brute force
,
strings
1000
x8948
254C
Anagram
greedy
,
strings
1800
x1471
250B
Restoring IPv6
implementation
,
strings
1500
x1953
245H
Queries for Number of Palindromes
dp
,
hashing
,
strings
1800
x6022
245F
Log Stream Analysis
binary search
,
brute force
,
implementation
,
strings
2000
x861
245B
Internet Address
implementation
,
strings
1100
x5138
236A
Boy or Girl
brute force
,
implementation
,
strings
800
x195254
235C
Cyclical Quest
data structures
,
string suffix structures
,
strings
2700
x2025
223B
Two Strings
data structures
,
dp
,
strings
1900
x1723
219A
k-String
implementation
,
strings
1000
x26206
213E
Two Permutations
data structures
,
hashing
,
strings
2700
x772
208A
Dubstep
strings
900
x84219
202A
LLPS
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
strings
800
x15947
196D
The Next Good String
data structures
,
greedy
,
hashing
,
strings
2800
x522
196A
Lexicographically Maximum Subsequence
greedy
,
strings
1100
x5311
186A
Comparing Strings
implementation
,
strings
1100
x16295
182D
Common Divisors
brute force
,
hashing
,
implementation
,
math
,
strings
1400
x7839
180D
Name
greedy
,
strings
1900
x714
178F2
Representative Sampling
dp
,
sortings
,
strings
2200
x316
177G2
Fibonacci Strings
matrices
,
strings
2600
x171
177G1
Fibonacci Strings
strings
2400
x164
168B
Wizards and Minimal Spell
implementation
,
strings
1700
x1200
165C
Another Problem on Strings
binary search
,
brute force
,
dp
,
math
,
strings
,
two pointers
1600
x11916
163E
e-Government
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2800
x1533
159D
Palindrome pairs
*special problem
,
brute force
,
dp
,
strings
1500
x4257
159C
String Manipulation 1.0
*special problem
,
binary search
,
brute force
,
data structures
,
strings
1400
x2922
151B
Phone Numbers
implementation
,
strings
1200
x6239
150D
Mission Impassable
dp
,
strings
2600
x589
149E
Martian Strings
string suffix structures
,
strings
2300
x1973
147A
Punctuation
implementation
,
strings
1300
x3564
144C
Anagram Search
implementation
,
strings
1500
x3891
143B
Help Kingdom of Far Far Away 2
implementation
,
strings
1200
x4920
141A
Amusing Joke
implementation
,
sortings
,
strings
800
x78454
137E
Last Chance
data structures
,
implementation
,
strings
2000
x1195
137D
Palindromes
dp
,
strings
1900
x1478
131A
cAPS lOCK
implementation
,
strings
1000
x81743
130B
Gnikool Ssalg
*special problem
,
implementation
,
strings
1400
x517
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2472
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x18010
123A
Prime Permutation
implementation
,
number theory
,
strings
1300
x3523
121B
Lucky Transformation
strings
1500
x2530
119D
String Transformation
hashing
,
strings
2500
x476
118C
Fancy Number
brute force
,
greedy
,
sortings
,
strings
1900
x2526
118A
String Task
implementation
,
strings
1000
x182573
113B
Petr#
brute force
,
data structures
,
hashing
,
strings
2000
x2734
113A
Grammar Lessons
implementation
,
strings
1600
x2240
112A
Petya and Strings
implementation
,
strings
800
x211032
110B
Lucky String
constructive algorithms
,
strings
1100
x9977
108A
Palindromic Times
implementation
,
strings
1000
x9205
100D
World of Mouth
*special problem
,
strings
1500
x298
99A
Help Far Away Kingdom
strings
800
x6530
96A
Football
implementation
,
strings
900
x150274
95A
Hockey
implementation
,
strings
1600
x1644
94A
Restoring Password
implementation
,
strings
900
x10181
91A
Newspaper Headline
greedy
,
strings
1500
x3502
90B
African Crossword
implementation
,
strings
1100
x5175
87B
Vasya and Types
implementation
,
strings
1800
x1116
81B
Sequence Formatting
implementation
,
strings
1700
x1879
79C
Beaver
data structures
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x1725
78A
Haiku
implementation
,
strings
800
x12015
75B
Facetook Priority Wall
expression parsing
,
implementation
,
strings
1500
x3225
72E
Ali goes shopping
*special problem
,
brute force
,
strings
1800
x150
71A
Way Too Long Words
strings
800
x357197
70B
Text Messaging
expression parsing
,
greedy
,
strings
1600
x1721
66A
Petya and Java
implementation
,
strings
1300
x6233
63A
Sinking Ship
implementation
,
sortings
,
strings
900
x10927
61B
Hard Work
strings
1300
x3793
59A
Word
implementation
,
strings
800
x163726
58D
Calendar
greedy
,
strings
2000
x714
58A
Chat room
greedy
,
strings
1000
x123112
54D
Writing a Song
brute force
,
dp
,
strings
2100
x511
50B
Choosing Symbol Pairs
strings
1500
x5552
43B
Letter
implementation
,
strings
1100
x15812
43A
Football
strings
1000
x52630
41A
Translation
implementation
,
strings
800
x136227
39J
Spelling Check
hashing
,
implementation
,
strings
1500
x2832
38F
Smart Boy
dp
,
games
,
strings
2100
x379
34C
Page Numbers
expression parsing
,
implementation
,
sortings
,
strings
1300
x4082
31B
Sysadmin Bob
greedy
,
implementation
,
strings
1500
x4124
30E
Tricky and Clever Password
binary search
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
strings
2800
x679
25E
Test
hashing
,
strings
2200
x2214
21A
Jabber ID
implementation
,
strings
1900
x1788
17E
Palisection
strings
2900
x1516
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