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When submitting a solution in C++, please select either C++14 (GCC 6-32) or C++17 (GCC 7-32) as your compiler.
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Codeforces Round 936 (Div. 2)
2 days
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Difficulty:
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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
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
x5892
1943B
Non-Palindromic Substring
data structures
,
hashing
,
implementation
,
math
,
strings
x2152
1941C
Rudolf and the Ugly String
dp
,
greedy
,
strings
900
x26312
1935A
Entertainment in MAC
constructive algorithms
,
strings
800
x23450
1931A
Recovering a Small String
brute force
,
strings
800
x32257
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2199
1930D1
Sum over all Substrings (Easy Version)
brute force
,
dp
,
greedy
,
strings
1800
x3394
1927B
Following the String
constructive algorithms
,
greedy
,
strings
900
x29042
1927A
Make it White
greedy
,
strings
800
x38125
1925A
We Got Everything Covered!
constructive algorithms
,
greedy
,
strings
800
x26410
1924A
Did We Get Everything Covered?
constructive algorithms
,
dp
,
greedy
,
shortest paths
,
strings
1500
x11676
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x284
1922A
Tricky Template
constructive algorithms
,
implementation
,
strings
800
x25291
1917B
Erase First or Second Letter
brute force
,
combinatorics
,
data structures
,
dp
,
strings
1100
x18290
1915D
Unnatural Language Processing
greedy
,
implementation
,
strings
900
x26335
1914A
Problemsolving Log
implementation
,
strings
800
x28829
1913F
Palindromic Problem
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2800
x264
1913B
Swap and Delete
strings
1000
x19864
1912L
LOL Lovers
strings
800
x5931
1909G
Pumping Lemma
hashing
,
strings
3000
x296
1907C
Removal of Unattractive Pairs
constructive algorithms
,
greedy
,
math
,
strings
1200
x17714
1907B
YetnotherrokenKeoard
data structures
,
implementation
,
strings
1000
x22289
1905C
Largest Subsequence
greedy
,
strings
1400
x10502
1902E
Collapsing Strings
data structures
,
strings
,
trees
1900
x3551
1900A
Cover in Water
constructive algorithms
,
greedy
,
implementation
,
strings
800
x19509
1898E
Sofia and Strings
data structures
,
greedy
,
sortings
,
strings
,
two pointers
2200
x1970
1898A
Milica and String
brute force
,
implementation
,
strings
800
x14656
1896B
AB Flipping
greedy
,
strings
,
two pointers
900
x12645
1894A
Secret Sport
implementation
,
strings
800
x17673
1886C
Decreasing String
implementation
,
strings
1600
x9756
1883B
Chemistry
strings
900
x24606
1881A
Don't Try to Count
brute force
,
strings
800
x25610
1867B
XOR Palindromes
bitmasks
,
constructive algorithms
,
strings
1100
x15391
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2427
1864B
Swap and Reverse
constructive algorithms
,
greedy
,
sortings
,
strings
1100
x14567
1862A
Gift Carpet
dp
,
greedy
,
implementation
,
strings
800
x30037
1861C
Queries for the Array
data structures
,
dfs and similar
,
implementation
,
strings
,
trees
1600
x9189
1860A
Not a Substring
constructive algorithms
,
strings
900
x20417
1851F
Lisa and the Martians
bitmasks
,
greedy
,
math
,
strings
,
trees
1800
x5091
1850C
Word on the Paper
implementation
,
strings
800
x39323
1849C
Binary String Copying
binary search
,
brute force
,
data structures
,
hashing
,
strings
1600
x9534
1847D
Professor Higashikata
data structures
,
dsu
,
greedy
,
implementation
,
strings
1900
x3509
1846B
Rudolph and Tic-Tac-Toe
brute force
,
implementation
,
strings
800
x25619
1845C
Strong Password
binary search
,
dp
,
greedy
,
strings
1400
x12985
1844D
Row Major
constructive algorithms
,
greedy
,
math
,
number theory
,
strings
1400
x11393
1841C
Ranom Numbers
brute force
,
dp
,
greedy
,
math
,
strings
1800
x7105
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x32020
1838D
Bracket Walk
data structures
,
greedy
,
strings
2100
x3003
1834C
Game with Reversing
games
,
greedy
,
math
,
strings
1200
x12357
1833A
Musical Puzzle
implementation
,
strings
800
x31135
1832A
New Palindrome
strings
800
x24403
1829A
Love Story
implementation
,
strings
800
x43923
1827C
Palindrome Partition
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
strings
2600
x1104
1825A
LuoTianyi and the Palindrome String
greedy
,
strings
800
x18832
1823D
Unique Palindromes
constructive algorithms
,
math
,
strings
1900
x3551
1822E
Making Anti-Palindromes
greedy
,
math
,
strings
1600
x9369
1821E
Rearrange Brackets
brute force
,
dp
,
greedy
,
sortings
,
strings
2100
x2170
1821C
Tear It Apart
brute force
,
implementation
,
math
,
strings
1300
x13293
1820B
JoJo's Incredible Adventures
math
,
strings
,
two pointers
1100
x12877
1820A
Yura's New Name
implementation
,
strings
800
x16223
1817F
Entangled Substrings
string suffix structures
,
strings
3500
x169
1815E
Bosco and Particle
dp
,
math
,
number theory
,
strings
3100
x312
1812J
Unmysterious Language
*special problem
,
constructive algorithms
,
strings
x5137
1812A
Are You a Robot?
*special problem
,
*special problem
,
*special problem
,
expression parsing
,
strings
x11632
1811A
Insert Digit
greedy
,
math
,
strings
800
x29557
1807C
Find and Replace
greedy
,
implementation
,
strings
800
x28628
1805B
The String Has a Target
greedy
,
strings
800
x18039
1801G
A task for substrings
data structures
,
string suffix structures
,
strings
3400
x273
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3574
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x11727
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x11860
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x21165
1800B
Count the Number of Pairs
greedy
,
strings
1000
x23523
1800A
Is It a Cat?
implementation
,
strings
800
x29279
1799C
Double Lexicographically Minimum
greedy
,
strings
1700
x5335
1796B
Asterisk-Minor Template
implementation
,
strings
1000
x15844
1796A
Typical Interview Problem
brute force
,
implementation
,
strings
800
x18426
1795A
Two Towers
brute force
,
implementation
,
strings
800
x23099
1794A
Prefix and Suffix Array
strings
800
x16442
1791D
Distinct Split
brute force
,
greedy
,
strings
1000
x25701
1791A
Codeforces Checking
implementation
,
strings
800
x52245
1790A
Polycarp and the Day of Pi
implementation
,
math
,
strings
800
x35173
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x502
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x15635
1781C
Equal Frequencies
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
,
strings
1600
x6863
1779A
Hall of Fame
constructive algorithms
,
greedy
,
strings
800
x22826
1778C
Flexible String
bitmasks
,
brute force
,
strings
1600
x7475
1777F
Comfortably Numb
bitmasks
,
data structures
,
divide and conquer
,
strings
,
trees
2400
x792
1776G
Another Wine Tasting Event
combinatorics
,
constructive algorithms
,
math
,
strings
2100
x1918
1771F
Hossam and Range Minimum Query
binary search
,
bitmasks
,
data structures
,
hashing
,
probabilities
,
strings
,
trees
2500
x931
1771D
Hossam and (sub-)palindromic tree
brute force
,
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2100
x2548
1760B
Atilla's Favorite Problem
greedy
,
implementation
,
strings
800
x40635
1759A
Yes-Yes?
implementation
,
strings
800
x28351
1758A
SSeeeeiinngg DDoouubbllee
constructive algorithms
,
strings
800
x24150
1750F
Majority
combinatorics
,
dp
,
math
,
strings
2700
x818
1750E
Bracket Cost
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
,
strings
2400
x1322
1748B
Diverse Substrings
brute force
,
implementation
,
strings
1400
x13985
1742F
Smaller
constructive algorithms
,
greedy
,
strings
1500
x10497
1741A
Compare T-Shirt Sizes
implementation
,
implementation
,
strings
800
x29303
1739F
Keyboard Design
bitmasks
,
data structures
,
dp
,
string suffix structures
,
strings
2600
x497
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