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Codeforces Round 940 (Div. 2) and CodeCraft-23
40:49:42
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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
Standings
Custom test
Problems
#
Name
1952H
Palindrome
implementation
,
strings
x313
1952B
Is it stated?
strings
x10029
1952A
Are You a Robot, Again?
strings
x11074
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x2740
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3106
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x10952
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x7854
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3087
1941C
Rudolf and the Ugly String
dp
,
greedy
,
strings
900
x28960
1935A
Entertainment in MAC
constructive algorithms
,
strings
800
x25036
1931A
Recovering a Small String
brute force
,
strings
800
x33163
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2321
1930D1
Sum over all Substrings (Easy Version)
brute force
,
dp
,
greedy
,
strings
1800
x3620
1927B
Following the String
constructive algorithms
,
greedy
,
strings
900
x29895
1927A
Make it White
greedy
,
strings
800
x39173
1925A
We Got Everything Covered!
constructive algorithms
,
greedy
,
strings
800
x26927
1924A
Did We Get Everything Covered?
constructive algorithms
,
dp
,
greedy
,
shortest paths
,
strings
1500
x12108
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x314
1922A
Tricky Template
constructive algorithms
,
implementation
,
strings
800
x25674
1917B
Erase First or Second Letter
brute force
,
combinatorics
,
data structures
,
dp
,
strings
1100
x19109
1915D
Unnatural Language Processing
greedy
,
implementation
,
strings
900
x27270
1914A
Problemsolving Log
implementation
,
strings
800
x29399
1913F
Palindromic Problem
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2800
x283
1913B
Swap and Delete
strings
1000
x21263
1912L
LOL Lovers
strings
800
x6167
1909G
Pumping Lemma
hashing
,
strings
3000
x316
1907C
Removal of Unattractive Pairs
constructive algorithms
,
greedy
,
math
,
strings
1200
x18147
1907B
YetnotherrokenKeoard
data structures
,
implementation
,
strings
1000
x22934
1905C
Largest Subsequence
greedy
,
strings
1400
x10877
1902E
Collapsing Strings
data structures
,
strings
,
trees
1900
x3692
1900A
Cover in Water
constructive algorithms
,
greedy
,
implementation
,
strings
800
x21330
1898E
Sofia and Strings
data structures
,
greedy
,
sortings
,
strings
,
two pointers
2200
x2018
1898A
Milica and String
brute force
,
implementation
,
strings
800
x14932
1896B
AB Flipping
greedy
,
strings
,
two pointers
900
x13217
1894A
Secret Sport
implementation
,
strings
800
x17939
1886C
Decreasing String
implementation
,
strings
1600
x10081
1883B
Chemistry
strings
900
x26232
1881A
Don't Try to Count
brute force
,
strings
800
x26923
1867B
XOR Palindromes
bitmasks
,
constructive algorithms
,
strings
1100
x15674
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2457
1864B
Swap and Reverse
constructive algorithms
,
greedy
,
sortings
,
strings
1100
x14696
1862A
Gift Carpet
dp
,
greedy
,
implementation
,
strings
800
x30491
1861C
Queries for the Array
data structures
,
dfs and similar
,
implementation
,
strings
,
trees
1600
x9378
1860A
Not a Substring
constructive algorithms
,
strings
900
x20702
1851F
Lisa and the Martians
bitmasks
,
greedy
,
math
,
strings
,
trees
1800
x5237
1850C
Word on the Paper
implementation
,
strings
800
x40477
1849C
Binary String Copying
binary search
,
brute force
,
data structures
,
hashing
,
strings
1600
x9742
1847D
Professor Higashikata
data structures
,
dsu
,
greedy
,
implementation
,
strings
1900
x3571
1846B
Rudolph and Tic-Tac-Toe
brute force
,
implementation
,
strings
800
x25918
1845C
Strong Password
binary search
,
dp
,
greedy
,
strings
1400
x13230
1844D
Row Major
constructive algorithms
,
greedy
,
math
,
number theory
,
strings
1400
x11562
1841C
Ranom Numbers
brute force
,
dp
,
greedy
,
math
,
strings
1800
x7233
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x32374
1838D
Bracket Walk
data structures
,
greedy
,
strings
2100
x3040
1834C
Game with Reversing
games
,
greedy
,
math
,
strings
1200
x12547
1833A
Musical Puzzle
implementation
,
strings
800
x31417
1832A
New Palindrome
strings
800
x24604
1829A
Love Story
implementation
,
strings
800
x45235
1827C
Palindrome Partition
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
strings
2600
x1118
1825A
LuoTianyi and the Palindrome String
greedy
,
strings
800
x19234
1823D
Unique Palindromes
constructive algorithms
,
math
,
strings
1900
x3625
1822E
Making Anti-Palindromes
greedy
,
math
,
strings
1600
x9603
1821E
Rearrange Brackets
brute force
,
dp
,
greedy
,
sortings
,
strings
2100
x2219
1821C
Tear It Apart
brute force
,
implementation
,
math
,
strings
1300
x13508
1820B
JoJo's Incredible Adventures
math
,
strings
,
two pointers
1100
x13219
1820A
Yura's New Name
implementation
,
strings
800
x16312
1817F
Entangled Substrings
string suffix structures
,
strings
3500
x177
1815E
Bosco and Particle
dp
,
math
,
number theory
,
strings
3100
x321
1812J
Unmysterious Language
*special problem
,
constructive algorithms
,
strings
x5777
1812A
Are You a Robot?
*special problem
,
*special problem
,
*special problem
,
expression parsing
,
strings
x13028
1811A
Insert Digit
greedy
,
math
,
strings
800
x29892
1807C
Find and Replace
greedy
,
implementation
,
strings
800
x29016
1805B
The String Has a Target
greedy
,
strings
800
x18141
1801G
A task for substrings
data structures
,
string suffix structures
,
strings
3400
x326
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3660
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x11950
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x12065
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x21553
1800B
Count the Number of Pairs
greedy
,
strings
1000
x23813
1800A
Is It a Cat?
implementation
,
strings
800
x29835
1799C
Double Lexicographically Minimum
greedy
,
strings
1700
x5420
1796B
Asterisk-Minor Template
implementation
,
strings
1000
x15959
1796A
Typical Interview Problem
brute force
,
implementation
,
strings
800
x18514
1795A
Two Towers
brute force
,
implementation
,
strings
800
x23193
1794A
Prefix and Suffix Array
strings
800
x16509
1791D
Distinct Split
brute force
,
greedy
,
strings
1000
x26566
1791A
Codeforces Checking
implementation
,
strings
800
x54243
1790A
Polycarp and the Day of Pi
implementation
,
math
,
strings
800
x35466
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x509
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x15723
1781C
Equal Frequencies
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
,
strings
1600
x6984
1779A
Hall of Fame
constructive algorithms
,
greedy
,
strings
800
x22860
1778C
Flexible String
bitmasks
,
brute force
,
strings
1600
x7607
1777F
Comfortably Numb
bitmasks
,
data structures
,
divide and conquer
,
strings
,
trees
2400
x806
1776G
Another Wine Tasting Event
combinatorics
,
constructive algorithms
,
math
,
strings
2100
x1938
1771F
Hossam and Range Minimum Query
binary search
,
bitmasks
,
data structures
,
hashing
,
probabilities
,
strings
,
trees
2500
x946
1771D
Hossam and (sub-)palindromic tree
brute force
,
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2100
x2579
1760B
Atilla's Favorite Problem
greedy
,
implementation
,
strings
800
x41341
1759A
Yes-Yes?
implementation
,
strings
800
x28624
1758A
SSeeeeiinngg DDoouubbllee
constructive algorithms
,
strings
800
x24278
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