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Codeforces Round 973 (Div. 2)
13:53:04
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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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Custom test
Problems
#
Name
2010C2
Message Transmission Error (hard version)
hashing
,
string suffix structures
,
strings
,
two pointers
1700
x2287
2010C1
Message Transmission Error (easy version)
brute force
,
strings
1400
x5455
2008E
Alternating String
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
strings
1500
x8260
2008B
Square or Not
brute force
,
math
,
strings
800
x25619
2005C
Lazy Narek
dp
,
implementation
,
strings
x5557
2003C
Turtle and Good Pairs
constructive algorithms
,
greedy
,
sortings
,
strings
1200
x16693
2003A
Turtle and Good Strings
greedy
,
strings
800
x27030
2000C
Numeric String Template
data structures
,
strings
1000
x23718
2000A
Primary Task
implementation
,
math
,
strings
800
x35013
1999D
Slavic's Exam
greedy
,
implementation
,
strings
1100
x25211
1997A
Strong Password
brute force
,
implementation
,
strings
800
x27425
1996C
Sort
dp
,
greedy
,
sortings
,
strings
1200
x21607
1995D
Cases
bitmasks
,
brute force
,
dp
,
strings
2300
x2192
1994H
Fortnite
combinatorics
,
constructive algorithms
,
games
,
greedy
,
hashing
,
interactive
,
math
,
number theory
,
strings
3500
x490
1992E
Novice's Mistake
brute force
,
constructive algorithms
,
implementation
,
math
,
strings
1700
x8738
1989B
Substring and Subsequence
brute force
,
greedy
,
strings
1200
x19395
1985A
Creating Words
implementation
,
strings
800
x50575
1984D
''a'' String Problem
brute force
,
hashing
,
implementation
,
math
,
string suffix structures
,
strings
2000
x3111
1980G
Yasya and the Mysterious Tree
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
strings
,
trees
2300
x1182
1979D
Fixing a Binary String
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
1800
x6360
1976A
Verify Password
implementation
,
sortings
,
strings
800
x27910
1975H
378QAQ and Core
greedy
,
strings
3500
x111
1975G
Zimpha Fan Club
fft
,
greedy
,
math
,
strings
3000
x216
1974B
Symmetric Encoding
implementation
,
sortings
,
strings
800
x29541
1971D
Binary Cut
dp
,
greedy
,
implementation
,
sortings
,
strings
1100
x25222
1971B
Different String
implementation
,
strings
800
x35766
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
2600
x198
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x569
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1872
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x4099
1965C
Folding Strip
constructive algorithms
,
greedy
,
strings
2300
x1853
1952H
Palindrome
implementation
,
strings
x689
1952B
Is it stated?
strings
x11064
1952A
Are You a Robot, Again?
strings
x12325
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x3547
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x4221
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x14074
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x9190
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3756
1941C
Rudolf and the Ugly String
dp
,
greedy
,
strings
900
x32801
1935A
Entertainment in MAC
constructive algorithms
,
strings
800
x27662
1931A
Recovering a Small String
brute force
,
strings
800
x35806
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2581
1930D1
Sum over all Substrings (Easy Version)
brute force
,
dp
,
greedy
,
strings
1800
x4044
1927B
Following the String
constructive algorithms
,
greedy
,
strings
900
x32702
1927A
Make it White
greedy
,
strings
800
x42495
1925A
We Got Everything Covered!
constructive algorithms
,
greedy
,
strings
800
x28470
1924A
Did We Get Everything Covered?
constructive algorithms
,
dp
,
greedy
,
shortest paths
,
strings
1500
x13709
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x371
1922A
Tricky Template
constructive algorithms
,
implementation
,
strings
800
x26803
1917B
Erase First or Second Letter
brute force
,
combinatorics
,
data structures
,
dp
,
strings
1100
x21839
1915D
Unnatural Language Processing
greedy
,
implementation
,
strings
900
x29889
1914A
Problemsolving Log
implementation
,
strings
800
x31564
1913F
Palindromic Problem
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2800
x319
1913B
Swap and Delete
strings
1000
x26092
1912L
LOL Lovers
strings
800
x6881
1909G
Pumping Lemma
hashing
,
strings
3000
x388
1907C
Removal of Unattractive Pairs
constructive algorithms
,
greedy
,
math
,
strings
1200
x19978
1907B
YetnotherrokenKeoard
data structures
,
implementation
,
strings
1000
x25222
1905C
Largest Subsequence
greedy
,
strings
1400
x12119
1902E
Collapsing Strings
data structures
,
strings
,
trees
1900
x4236
1900A
Cover in Water
constructive algorithms
,
greedy
,
implementation
,
strings
800
x27123
1898E
Sofia and Strings
data structures
,
greedy
,
sortings
,
strings
,
two pointers
2200
x2241
1898A
Milica and String
brute force
,
implementation
,
strings
800
x15932
1896B
AB Flipping
greedy
,
strings
,
two pointers
900
x14633
1894A
Secret Sport
implementation
,
strings
800
x18862
1886C
Decreasing String
implementation
,
strings
1600
x11364
1883B
Chemistry
strings
900
x31619
1881A
Don't Try to Count
brute force
,
strings
800
x31472
1867B
XOR Palindromes
bitmasks
,
constructive algorithms
,
strings
1100
x16645
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2578
1864B
Swap and Reverse
constructive algorithms
,
greedy
,
sortings
,
strings
1100
x15307
1862A
Gift Carpet
dp
,
greedy
,
implementation
,
strings
800
x32332
1861C
Queries for the Array
data structures
,
dfs and similar
,
implementation
,
strings
,
trees
1600
x10045
1860A
Not a Substring
constructive algorithms
,
strings
900
x21621
1851F
Lisa and the Martians
bitmasks
,
greedy
,
math
,
strings
,
trees
1800
x5789
1850C
Word on the Paper
implementation
,
strings
800
x43850
1849C
Binary String Copying
binary search
,
brute force
,
data structures
,
hashing
,
strings
1600
x10457
1847D
Professor Higashikata
data structures
,
dsu
,
greedy
,
implementation
,
strings
1900
x3741
1846B
Rudolph and Tic-Tac-Toe
brute force
,
implementation
,
strings
800
x26814
1845C
Strong Password
binary search
,
dp
,
greedy
,
strings
1400
x14156
1844D
Row Major
constructive algorithms
,
greedy
,
math
,
number theory
,
strings
1400
x12240
1841C
Ranom Numbers
brute force
,
dp
,
greedy
,
math
,
strings
1800
x7785
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x33878
1838D
Bracket Walk
data structures
,
greedy
,
strings
2100
x3240
1834C
Game with Reversing
games
,
greedy
,
math
,
strings
1200
x13228
1833A
Musical Puzzle
implementation
,
strings
800
x32525
1832A
New Palindrome
strings
800
x25596
1829A
Love Story
implementation
,
strings
800
x50223
1827C
Palindrome Partition
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
strings
2600
x1199
1825A
LuoTianyi and the Palindrome String
greedy
,
strings
800
x19616
1823D
Unique Palindromes
constructive algorithms
,
math
,
strings
1900
x3815
1822E
Making Anti-Palindromes
greedy
,
math
,
strings
1600
x10383
1821E
Rearrange Brackets
brute force
,
dp
,
greedy
,
sortings
,
strings
2100
x2357
1821C
Tear It Apart
brute force
,
implementation
,
math
,
strings
1300
x14222
1820B
JoJo's Incredible Adventures
math
,
strings
,
two pointers
1100
x14564
1820A
Yura's New Name
implementation
,
strings
800
x16650
1817F
Entangled Substrings
string suffix structures
,
strings
3500
x206
1815E
Bosco and Particle
dp
,
math
,
number theory
,
strings
3100
x347
1812J
Unmysterious Language
*special problem
,
constructive algorithms
,
strings
x5899
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