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Codeforces Round 950 (Div. 3)
40:26:27
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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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Status
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Custom test
Problems
#
Name
1975H
378QAQ and Core
greedy
,
strings
3500
x37
1975G
Zimpha Fan Club
fft
,
greedy
,
math
,
strings
3000
x137
1974B
Symmetric Encoding
implementation
,
sortings
,
strings
800
x25687
1971D
Binary Cut
dp
,
greedy
,
implementation
,
sortings
,
strings
1100
x21011
1971B
Different String
implementation
,
strings
800
x29752
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
2600
x138
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x439
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1499
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x3387
1965C
Folding Strip
constructive algorithms
,
greedy
,
strings
2300
x1531
1952H
Palindrome
implementation
,
strings
x361
1952B
Is it stated?
strings
x10419
1952A
Are You a Robot, Again?
strings
x11500
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x3124
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3649
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x12449
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x8394
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3407
1941C
Rudolf and the Ugly String
dp
,
greedy
,
strings
900
x30310
1935A
Entertainment in MAC
constructive algorithms
,
strings
800
x25901
1931A
Recovering a Small String
brute force
,
strings
800
x33977
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2401
1930D1
Sum over all Substrings (Easy Version)
brute force
,
dp
,
greedy
,
strings
1800
x3747
1927B
Following the String
constructive algorithms
,
greedy
,
strings
900
x30798
1927A
Make it White
greedy
,
strings
800
x40198
1925A
We Got Everything Covered!
constructive algorithms
,
greedy
,
strings
800
x27428
1924A
Did We Get Everything Covered?
constructive algorithms
,
dp
,
greedy
,
shortest paths
,
strings
1500
x12573
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x338
1922A
Tricky Template
constructive algorithms
,
implementation
,
strings
800
x26050
1917B
Erase First or Second Letter
brute force
,
combinatorics
,
data structures
,
dp
,
strings
1100
x19770
1915D
Unnatural Language Processing
greedy
,
implementation
,
strings
900
x28077
1914A
Problemsolving Log
implementation
,
strings
800
x30029
1913F
Palindromic Problem
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2800
x292
1913B
Swap and Delete
strings
1000
x22543
1912L
LOL Lovers
strings
800
x6418
1909G
Pumping Lemma
hashing
,
strings
3000
x327
1907C
Removal of Unattractive Pairs
constructive algorithms
,
greedy
,
math
,
strings
1200
x18697
1907B
YetnotherrokenKeoard
data structures
,
implementation
,
strings
1000
x23641
1905C
Largest Subsequence
greedy
,
strings
1400
x11172
1902E
Collapsing Strings
data structures
,
strings
,
trees
1900
x3927
1900A
Cover in Water
constructive algorithms
,
greedy
,
implementation
,
strings
800
x22669
1898E
Sofia and Strings
data structures
,
greedy
,
sortings
,
strings
,
two pointers
2200
x2076
1898A
Milica and String
brute force
,
implementation
,
strings
800
x15203
1896B
AB Flipping
greedy
,
strings
,
two pointers
900
x13641
1894A
Secret Sport
implementation
,
strings
800
x18227
1886C
Decreasing String
implementation
,
strings
1600
x10414
1883B
Chemistry
strings
900
x27589
1881A
Don't Try to Count
brute force
,
strings
800
x28078
1867B
XOR Palindromes
bitmasks
,
constructive algorithms
,
strings
1100
x15996
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2481
1864B
Swap and Reverse
constructive algorithms
,
greedy
,
sortings
,
strings
1100
x14860
1862A
Gift Carpet
dp
,
greedy
,
implementation
,
strings
800
x31109
1861C
Queries for the Array
data structures
,
dfs and similar
,
implementation
,
strings
,
trees
1600
x9575
1860A
Not a Substring
constructive algorithms
,
strings
900
x20957
1851F
Lisa and the Martians
bitmasks
,
greedy
,
math
,
strings
,
trees
1800
x5385
1850C
Word on the Paper
implementation
,
strings
800
x41637
1849C
Binary String Copying
binary search
,
brute force
,
data structures
,
hashing
,
strings
1600
x9939
1847D
Professor Higashikata
data structures
,
dsu
,
greedy
,
implementation
,
strings
1900
x3622
1846B
Rudolph and Tic-Tac-Toe
brute force
,
implementation
,
strings
800
x26204
1845C
Strong Password
binary search
,
dp
,
greedy
,
strings
1400
x13458
1844D
Row Major
constructive algorithms
,
greedy
,
math
,
number theory
,
strings
1400
x11726
1841C
Ranom Numbers
brute force
,
dp
,
greedy
,
math
,
strings
1800
x7374
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x32852
1838D
Bracket Walk
data structures
,
greedy
,
strings
2100
x3099
1834C
Game with Reversing
games
,
greedy
,
math
,
strings
1200
x12731
1833A
Musical Puzzle
implementation
,
strings
800
x31739
1832A
New Palindrome
strings
800
x25004
1829A
Love Story
implementation
,
strings
800
x46698
1827C
Palindrome Partition
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
strings
2600
x1155
1825A
LuoTianyi and the Palindrome String
greedy
,
strings
800
x19344
1823D
Unique Palindromes
constructive algorithms
,
math
,
strings
1900
x3675
1822E
Making Anti-Palindromes
greedy
,
math
,
strings
1600
x9810
1821E
Rearrange Brackets
brute force
,
dp
,
greedy
,
sortings
,
strings
2100
x2270
1821C
Tear It Apart
brute force
,
implementation
,
math
,
strings
1300
x13713
1820B
JoJo's Incredible Adventures
math
,
strings
,
two pointers
1100
x13560
1820A
Yura's New Name
implementation
,
strings
800
x16405
1817F
Entangled Substrings
string suffix structures
,
strings
3500
x184
1815E
Bosco and Particle
dp
,
math
,
number theory
,
strings
3100
x330
1812J
Unmysterious Language
*special problem
,
constructive algorithms
,
strings
x5809
1812A
Are You a Robot?
*special problem
,
*special problem
,
*special problem
,
expression parsing
,
strings
x13094
1811A
Insert Digit
greedy
,
math
,
strings
800
x30201
1807C
Find and Replace
greedy
,
implementation
,
strings
800
x29356
1805B
The String Has a Target
greedy
,
strings
800
x18221
1801G
A task for substrings
data structures
,
string suffix structures
,
strings
3400
x353
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3725
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x12175
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x12237
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x21911
1800B
Count the Number of Pairs
greedy
,
strings
1000
x24090
1800A
Is It a Cat?
implementation
,
strings
800
x30179
1799C
Double Lexicographically Minimum
greedy
,
strings
1700
x5511
1796B
Asterisk-Minor Template
implementation
,
strings
1000
x16109
1796A
Typical Interview Problem
brute force
,
implementation
,
strings
800
x18603
1795A
Two Towers
brute force
,
implementation
,
strings
800
x23293
1794A
Prefix and Suffix Array
strings
800
x16663
1791D
Distinct Split
brute force
,
greedy
,
strings
1000
x27356
1791A
Codeforces Checking
implementation
,
strings
800
x55827
1790A
Polycarp and the Day of Pi
implementation
,
math
,
strings
800
x35826
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x523
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x15854
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