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Codeforces Round (Div. 2)
5 days
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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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Problems
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Status
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Custom test
Problems
#
Name
1989B
Substring and Subsequence
brute force
,
greedy
,
strings
1200
x13702
1985A
Creating Words
implementation
,
strings
800
x41825
1984D
''a'' String Problem
brute force
,
hashing
,
implementation
,
math
,
string suffix structures
,
strings
2000
x2653
1980G
Yasya and the Mysterious Tree
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
strings
,
trees
2300
x934
1979D
Fixing a Binary String
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
1800
x5437
1976A
Verify Password
implementation
,
sortings
,
strings
800
x25239
1975H
378QAQ and Core
greedy
,
strings
3500
x77
1975G
Zimpha Fan Club
fft
,
greedy
,
math
,
strings
3000
x193
1974B
Symmetric Encoding
implementation
,
sortings
,
strings
800
x27877
1971D
Binary Cut
dp
,
greedy
,
implementation
,
sortings
,
strings
1100
x22972
1971B
Different String
implementation
,
strings
800
x32593
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
2600
x162
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x487
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1669
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x3683
1965C
Folding Strip
constructive algorithms
,
greedy
,
strings
2300
x1620
1952H
Palindrome
implementation
,
strings
x384
1952B
Is it stated?
strings
x10562
1952A
Are You a Robot, Again?
strings
x11715
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x3273
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3863
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x13087
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x8652
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3520
1941C
Rudolf and the Ugly String
dp
,
greedy
,
strings
900
x31181
1935A
Entertainment in MAC
constructive algorithms
,
strings
800
x26520
1931A
Recovering a Small String
brute force
,
strings
800
x34527
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2458
1930D1
Sum over all Substrings (Easy Version)
brute force
,
dp
,
greedy
,
strings
1800
x3841
1927B
Following the String
constructive algorithms
,
greedy
,
strings
900
x31409
1927A
Make it White
greedy
,
strings
800
x41007
1925A
We Got Everything Covered!
constructive algorithms
,
greedy
,
strings
800
x27828
1924A
Did We Get Everything Covered?
constructive algorithms
,
dp
,
greedy
,
shortest paths
,
strings
1500
x12909
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x345
1922A
Tricky Template
constructive algorithms
,
implementation
,
strings
800
x26322
1917B
Erase First or Second Letter
brute force
,
combinatorics
,
data structures
,
dp
,
strings
1100
x20379
1915D
Unnatural Language Processing
greedy
,
implementation
,
strings
900
x28679
1914A
Problemsolving Log
implementation
,
strings
800
x30500
1913F
Palindromic Problem
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2800
x296
1913B
Swap and Delete
strings
1000
x23502
1912L
LOL Lovers
strings
800
x6568
1909G
Pumping Lemma
hashing
,
strings
3000
x355
1907C
Removal of Unattractive Pairs
constructive algorithms
,
greedy
,
math
,
strings
1200
x19053
1907B
YetnotherrokenKeoard
data structures
,
implementation
,
strings
1000
x24144
1905C
Largest Subsequence
greedy
,
strings
1400
x11441
1902E
Collapsing Strings
data structures
,
strings
,
trees
1900
x4010
1900A
Cover in Water
constructive algorithms
,
greedy
,
implementation
,
strings
800
x23719
1898E
Sofia and Strings
data structures
,
greedy
,
sortings
,
strings
,
two pointers
2200
x2124
1898A
Milica and String
brute force
,
implementation
,
strings
800
x15416
1896B
AB Flipping
greedy
,
strings
,
two pointers
900
x13949
1894A
Secret Sport
implementation
,
strings
800
x18427
1886C
Decreasing String
implementation
,
strings
1600
x10693
1883B
Chemistry
strings
900
x28793
1881A
Don't Try to Count
brute force
,
strings
800
x28936
1867B
XOR Palindromes
bitmasks
,
constructive algorithms
,
strings
1100
x16274
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2504
1864B
Swap and Reverse
constructive algorithms
,
greedy
,
sortings
,
strings
1100
x14986
1862A
Gift Carpet
dp
,
greedy
,
implementation
,
strings
800
x31494
1861C
Queries for the Array
data structures
,
dfs and similar
,
implementation
,
strings
,
trees
1600
x9707
1860A
Not a Substring
constructive algorithms
,
strings
900
x21187
1851F
Lisa and the Martians
bitmasks
,
greedy
,
math
,
strings
,
trees
1800
x5508
1850C
Word on the Paper
implementation
,
strings
800
x42345
1849C
Binary String Copying
binary search
,
brute force
,
data structures
,
hashing
,
strings
1600
x10094
1847D
Professor Higashikata
data structures
,
dsu
,
greedy
,
implementation
,
strings
1900
x3654
1846B
Rudolph and Tic-Tac-Toe
brute force
,
implementation
,
strings
800
x26416
1845C
Strong Password
binary search
,
dp
,
greedy
,
strings
1400
x13650
1844D
Row Major
constructive algorithms
,
greedy
,
math
,
number theory
,
strings
1400
x11915
1841C
Ranom Numbers
brute force
,
dp
,
greedy
,
math
,
strings
1800
x7466
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x33266
1838D
Bracket Walk
data structures
,
greedy
,
strings
2100
x3128
1834C
Game with Reversing
games
,
greedy
,
math
,
strings
1200
x12894
1833A
Musical Puzzle
implementation
,
strings
800
x32001
1832A
New Palindrome
strings
800
x25136
1829A
Love Story
implementation
,
strings
800
x47860
1827C
Palindrome Partition
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
strings
2600
x1163
1825A
LuoTianyi and the Palindrome String
greedy
,
strings
800
x19416
1823D
Unique Palindromes
constructive algorithms
,
math
,
strings
1900
x3724
1822E
Making Anti-Palindromes
greedy
,
math
,
strings
1600
x10000
1821E
Rearrange Brackets
brute force
,
dp
,
greedy
,
sortings
,
strings
2100
x2296
1821C
Tear It Apart
brute force
,
implementation
,
math
,
strings
1300
x13850
1820B
JoJo's Incredible Adventures
math
,
strings
,
two pointers
1100
x13862
1820A
Yura's New Name
implementation
,
strings
800
x16488
1817F
Entangled Substrings
string suffix structures
,
strings
3500
x186
1815E
Bosco and Particle
dp
,
math
,
number theory
,
strings
3100
x332
1812J
Unmysterious Language
*special problem
,
constructive algorithms
,
strings
x5834
1812A
Are You a Robot?
*special problem
,
*special problem
,
*special problem
,
expression parsing
,
strings
x13149
1811A
Insert Digit
greedy
,
math
,
strings
800
x30444
1807C
Find and Replace
greedy
,
implementation
,
strings
800
x29658
1805B
The String Has a Target
greedy
,
strings
800
x18338
1801G
A task for substrings
data structures
,
string suffix structures
,
strings
3400
x356
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3769
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x12327
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x12377
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x22250
1800B
Count the Number of Pairs
greedy
,
strings
1000
x24364
1800A
Is It a Cat?
implementation
,
strings
800
x30482
1799C
Double Lexicographically Minimum
greedy
,
strings
1700
x5627
1796B
Asterisk-Minor Template
implementation
,
strings
1000
x16206
1796A
Typical Interview Problem
brute force
,
implementation
,
strings
800
x18658
1795A
Two Towers
brute force
,
implementation
,
strings
800
x23403
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