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Codeforces Round 1097 (Div. 1, Based on Zhili Cup 2026)
4 days
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Before contest
Codeforces Round 1097 (Div. 2, Based on Zhili Cup 2026)
4 days
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→ Filter Problems
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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
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sortings
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strings
ternary search
trees
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Custom test
Problems
#
Name
432D
Prefixes and Suffixes
dp
,
string suffix structures
,
strings
,
two pointers
2000
x11907
427D
Match & Catch
dp
,
string suffix structures
,
strings
2200
x2422
412C
Pattern
implementation
,
strings
1200
x4220
386C
Diverse Substrings
dp
,
strings
,
two pointers
2000
x949
385B
Bear and Strings
brute force
,
greedy
,
implementation
,
math
,
strings
1200
x10832
358B
Dima and Text Messages
brute force
,
strings
1500
x3908
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x490
346B
Lucky Common Subsequence
dp
,
strings
2000
x4256
345G
Suffix Subgroup
*special problem
,
strings
2200
x105
339A
Helpful Maths
greedy
,
implementation
,
sortings
,
strings
800
x274679
319D
Have You Ever Heard About the Word?
greedy
,
hashing
,
string suffix structures
,
strings
2800
x777
318B
Strings of Power
implementation
,
strings
,
two pointers
1300
x8296
316G1
Good Substrings
hashing
,
strings
1700
x1085
314B
Sereja and Periods
binary search
,
dfs and similar
,
strings
2000
x1618
312A
Whose sentence is it?
implementation
,
strings
1100
x5357
291E
Tree-String Problem
*special problem
,
dfs and similar
,
hashing
,
strings
2000
x1573
291B
Command Line Arguments
*special problem
,
implementation
,
strings
1300
x3086
281A
Word Capitalization
implementation
,
strings
800
x270481
278B
New Problem
brute force
,
strings
1500
x3639
271D
Good Substrings
data structures
,
strings
1800
x13974
269E
String Theory
geometry
,
math
,
strings
3100
x118
260B
Ancient Prophesy
brute force
,
implementation
,
strings
1600
x4078
259A
Little Elephant and Chess
brute force
,
strings
1000
x10031
254C
Anagram
greedy
,
strings
1800
x1603
250B
Restoring IPv6
implementation
,
strings
1500
x2237
245H
Queries for Number of Palindromes
dp
,
hashing
,
strings
1800
x9047
245F
Log Stream Analysis
binary search
,
brute force
,
implementation
,
strings
2000
x976
245B
Internet Address
implementation
,
strings
1100
x5520
236A
Boy or Girl
brute force
,
implementation
,
strings
800
x278446
235C
Cyclical Quest
data structures
,
string suffix structures
,
strings
2700
x2464
223B
Two Strings
data structures
,
dp
,
strings
1900
x2031
219A
k-String
implementation
,
strings
1000
x32293
213E
Two Permutations
data structures
,
hashing
,
strings
2700
x967
208A
Dubstep
strings
900
x104978
202A
LLPS
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
strings
800
x19745
196D
The Next Good String
data structures
,
greedy
,
hashing
,
strings
2800
x599
196A
Lexicographically Maximum Subsequence
greedy
,
strings
1100
x5843
186A
Comparing Strings
implementation
,
strings
1100
x18459
182D
Common Divisors
brute force
,
hashing
,
implementation
,
math
,
strings
1400
x9237
180D
Name
greedy
,
strings
1900
x812
178F2
Representative Sampling
dp
,
sortings
,
strings
2200
x384
177G2
Fibonacci Strings
matrices
,
strings
2600
x244
177G1
Fibonacci Strings
strings
2400
x226
168B
Wizards and Minimal Spell
implementation
,
strings
1700
x1305
165C
Another Problem on Strings
binary search
,
brute force
,
dp
,
math
,
strings
,
two pointers
1600
x13814
163E
e-Government
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2800
x2181
159D
Palindrome pairs
*special problem
,
brute force
,
dp
,
strings
1500
x4685
159C
String Manipulation 1.0
*special problem
,
binary search
,
brute force
,
data structures
,
strings
1400
x3204
151B
Phone Numbers
implementation
,
strings
1200
x6861
150D
Mission Impassable
dp
,
strings
2600
x738
149E
Martian Strings
string suffix structures
,
strings
2300
x2500
147A
Punctuation
implementation
,
strings
1300
x4233
144C
Anagram Search
implementation
,
strings
1500
x4264
143B
Help Kingdom of Far Far Away 2
implementation
,
strings
1200
x5333
141A
Amusing Joke
implementation
,
sortings
,
strings
800
x101340
137E
Last Chance
data structures
,
implementation
,
strings
2000
x1377
137D
Palindromes
dp
,
strings
1900
x1722
131A
cAPS lOCK
implementation
,
strings
1000
x100897
130B
Gnikool Ssalg
*special problem
,
implementation
,
strings
1400
x563
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2869
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x24731
123A
Prime Permutation
implementation
,
number theory
,
strings
1300
x3986
121B
Lucky Transformation
strings
1500
x2821
119D
String Transformation
hashing
,
strings
2500
x623
118C
Fancy Number
brute force
,
greedy
,
sortings
,
strings
1900
x2871
118A
String Task
implementation
,
strings
1000
x231231
113B
Petr#
brute force
,
data structures
,
hashing
,
strings
2000
x3240
113A
Grammar Lessons
implementation
,
strings
1600
x2603
112A
Petya and Strings
implementation
,
strings
800
x286843
110B
Lucky String
constructive algorithms
,
strings
1100
x11018
108A
Palindromic Times
implementation
,
strings
1000
x10345
100D
World of Mouth
*special problem
,
strings
1500
x365
99A
Help Far Away Kingdom
strings
800
x7718
96A
Football
implementation
,
strings
900
x193505
95A
Hockey
implementation
,
strings
1600
x1856
94A
Restoring Password
implementation
,
strings
900
x12256
91A
Newspaper Headline
greedy
,
strings
1500
x3951
90B
African Crossword
implementation
,
strings
1100
x5714
87B
Vasya and Types
implementation
,
strings
1800
x1265
81B
Sequence Formatting
implementation
,
strings
1700
x2141
79C
Beaver
data structures
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x2111
78A
Haiku
implementation
,
strings
800
x15429
75B
Facetook Priority Wall
expression parsing
,
implementation
,
strings
1500
x3621
72E
Ali goes shopping
*special problem
,
brute force
,
strings
1800
x181
71A
Way Too Long Words
strings
800
x502628
70B
Text Messaging
expression parsing
,
greedy
,
strings
1600
x2102
66A
Petya and Java
implementation
,
strings
1300
x7079
63A
Sinking Ship
implementation
,
sortings
,
strings
900
x13414
61B
Hard Work
strings
1300
x4240
59A
Word
implementation
,
strings
800
x227657
58D
Calendar
greedy
,
strings
2000
x835
58A
Chat room
greedy
,
strings
1000
x155849
54D
Writing a Song
brute force
,
dp
,
strings
2100
x709
50B
Choosing Symbol Pairs
strings
1500
x6447
43B
Letter
implementation
,
strings
1100
x20474
43A
Football
strings
1000
x69106
41A
Translation
implementation
,
strings
800
x188235
39J
Spelling Check
hashing
,
implementation
,
strings
1500
x3569
38F
Smart Boy
dp
,
games
,
strings
2100
x446
34C
Page Numbers
expression parsing
,
implementation
,
sortings
,
strings
1300
x4765
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