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Problems
#
Name
1971D
Binary Cut
dp
,
greedy
,
implementation
,
sortings
,
strings
1100
x19091
1971B
Different String
implementation
,
strings
800
x27281
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
2600
x127
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x404
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1382
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x3146
1965C
Folding Strip
constructive algorithms
,
greedy
,
strings
2300
x1439
1952H
Palindrome
implementation
,
strings
x357
1952B
Is it stated?
strings
x10340
1952A
Are You a Robot, Again?
strings
x11417
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x3051
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3548
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x12145
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x8266
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3333
1941C
Rudolf and the Ugly String
dp
,
greedy
,
strings
900
x29895
1935A
Entertainment in MAC
constructive algorithms
,
strings
800
x25596
1931A
Recovering a Small String
brute force
,
strings
800
x33714
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2379
1930D1
Sum over all Substrings (Easy Version)
brute force
,
dp
,
greedy
,
strings
1800
x3708
1927B
Following the String
constructive algorithms
,
greedy
,
strings
900
x30553
1927A
Make it White
greedy
,
strings
800
x39899
1925A
We Got Everything Covered!
constructive algorithms
,
greedy
,
strings
800
x27216
1924A
Did We Get Everything Covered?
constructive algorithms
,
dp
,
greedy
,
shortest paths
,
strings
1500
x12426
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x333
1922A
Tricky Template
constructive algorithms
,
implementation
,
strings
800
x25914
1917B
Erase First or Second Letter
brute force
,
combinatorics
,
data structures
,
dp
,
strings
1100
x19535
1915D
Unnatural Language Processing
greedy
,
implementation
,
strings
900
x27870
1914A
Problemsolving Log
implementation
,
strings
800
x29872
1913F
Palindromic Problem
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2800
x290
1913B
Swap and Delete
strings
1000
x22077
1912L
LOL Lovers
strings
800
x6362
1909G
Pumping Lemma
hashing
,
strings
3000
x319
1907C
Removal of Unattractive Pairs
constructive algorithms
,
greedy
,
math
,
strings
1200
x18515
1907B
YetnotherrokenKeoard
data structures
,
implementation
,
strings
1000
x23426
1905C
Largest Subsequence
greedy
,
strings
1400
x11089
1902E
Collapsing Strings
data structures
,
strings
,
trees
1900
x3784
1900A
Cover in Water
constructive algorithms
,
greedy
,
implementation
,
strings
800
x22204
1898E
Sofia and Strings
data structures
,
greedy
,
sortings
,
strings
,
two pointers
2200
x2062
1898A
Milica and String
brute force
,
implementation
,
strings
800
x15117
1896B
AB Flipping
greedy
,
strings
,
two pointers
900
x13451
1894A
Secret Sport
implementation
,
strings
800
x18150
1886C
Decreasing String
implementation
,
strings
1600
x10298
1883B
Chemistry
strings
900
x27129
1881A
Don't Try to Count
brute force
,
strings
800
x27671
1867B
XOR Palindromes
bitmasks
,
constructive algorithms
,
strings
1100
x15896
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2469
1864B
Swap and Reverse
constructive algorithms
,
greedy
,
sortings
,
strings
1100
x14793
1862A
Gift Carpet
dp
,
greedy
,
implementation
,
strings
800
x30915
1861C
Queries for the Array
data structures
,
dfs and similar
,
implementation
,
strings
,
trees
1600
x9504
1860A
Not a Substring
constructive algorithms
,
strings
900
x20863
1851F
Lisa and the Martians
bitmasks
,
greedy
,
math
,
strings
,
trees
1800
x5328
1850C
Word on the Paper
implementation
,
strings
800
x41343
1849C
Binary String Copying
binary search
,
brute force
,
data structures
,
hashing
,
strings
1600
x9883
1847D
Professor Higashikata
data structures
,
dsu
,
greedy
,
implementation
,
strings
1900
x3608
1846B
Rudolph and Tic-Tac-Toe
brute force
,
implementation
,
strings
800
x26138
1845C
Strong Password
binary search
,
dp
,
greedy
,
strings
1400
x13372
1844D
Row Major
constructive algorithms
,
greedy
,
math
,
number theory
,
strings
1400
x11657
1841C
Ranom Numbers
brute force
,
dp
,
greedy
,
math
,
strings
1800
x7332
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x32685
1838D
Bracket Walk
data structures
,
greedy
,
strings
2100
x3085
1834C
Game with Reversing
games
,
greedy
,
math
,
strings
1200
x12674
1833A
Musical Puzzle
implementation
,
strings
800
x31647
1832A
New Palindrome
strings
800
x24930
1829A
Love Story
implementation
,
strings
800
x46181
1827C
Palindrome Partition
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
strings
2600
x1148
1825A
LuoTianyi and the Palindrome String
greedy
,
strings
800
x19299
1823D
Unique Palindromes
constructive algorithms
,
math
,
strings
1900
x3663
1822E
Making Anti-Palindromes
greedy
,
math
,
strings
1600
x9744
1821E
Rearrange Brackets
brute force
,
dp
,
greedy
,
sortings
,
strings
2100
x2252
1821C
Tear It Apart
brute force
,
implementation
,
math
,
strings
1300
x13630
1820B
JoJo's Incredible Adventures
math
,
strings
,
two pointers
1100
x13458
1820A
Yura's New Name
implementation
,
strings
800
x16375
1817F
Entangled Substrings
string suffix structures
,
strings
3500
x180
1815E
Bosco and Particle
dp
,
math
,
number theory
,
strings
3100
x328
1812J
Unmysterious Language
*special problem
,
constructive algorithms
,
strings
x5798
1812A
Are You a Robot?
*special problem
,
*special problem
,
*special problem
,
expression parsing
,
strings
x13067
1811A
Insert Digit
greedy
,
math
,
strings
800
x30101
1807C
Find and Replace
greedy
,
implementation
,
strings
800
x29271
1805B
The String Has a Target
greedy
,
strings
800
x18191
1801G
A task for substrings
data structures
,
string suffix structures
,
strings
3400
x351
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3705
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x12104
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x12190
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x21786
1800B
Count the Number of Pairs
greedy
,
strings
1000
x24002
1800A
Is It a Cat?
implementation
,
strings
800
x30061
1799C
Double Lexicographically Minimum
greedy
,
strings
1700
x5476
1796B
Asterisk-Minor Template
implementation
,
strings
1000
x16061
1796A
Typical Interview Problem
brute force
,
implementation
,
strings
800
x18580
1795A
Two Towers
brute force
,
implementation
,
strings
800
x23265
1794A
Prefix and Suffix Array
strings
800
x16573
1791D
Distinct Split
brute force
,
greedy
,
strings
1000
x27100
1791A
Codeforces Checking
implementation
,
strings
800
x55390
1790A
Polycarp and the Day of Pi
implementation
,
math
,
strings
800
x35720
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x521
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x15815
1781C
Equal Frequencies
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
,
strings
1600
x7085
1779A
Hall of Fame
constructive algorithms
,
greedy
,
strings
800
x22904
1778C
Flexible String
bitmasks
,
brute force
,
strings
1600
x7700
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