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Codeforces Round 945 (Div. 2)
2 days
Register now »
*has extra registration
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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
#
Name
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x12277
1536B
Prinzessin der Verurteilung
brute force
,
constructive algorithms
,
strings
1200
x17748
1535F
String Distance
binary search
,
brute force
,
data structures
,
hashing
,
implementation
,
strings
3000
x438
1535C
Unstable String
binary search
,
dp
,
greedy
,
implementation
,
strings
,
two pointers
1400
x16105
1532F
Prefixes and Suffixes
*special problem
,
strings
x216
1530E
Minimax
constructive algorithms
,
greedy
,
strings
2100
x2897
1526D
Kill Anton
brute force
,
constructive algorithms
,
data structures
,
math
,
strings
2200
x2357
1512C
A-B Palindrome
constructive algorithms
,
implementation
,
strings
1200
x19471
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x418
1511D
Min Cost String
brute force
,
constructive algorithms
,
graphs
,
greedy
,
strings
1600
x11060
1508A
Binary Literature
constructive algorithms
,
greedy
,
implementation
,
strings
,
two pointers
1900
x6013
1506G
Maximize the Remaining String
brute force
,
data structures
,
dp
,
greedy
,
strings
2000
x4097
1506C
Double-ended Strings
brute force
,
implementation
,
strings
1000
x23433
1504A
Déjà Vu
constructive algorithms
,
strings
800
x21410
1499E
Chaotic Merge
combinatorics
,
dp
,
math
,
strings
2400
x1407
1496A
Split it!
brute force
,
constructive algorithms
,
greedy
,
strings
900
x20279
1493E
Enormous XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
,
strings
,
two pointers
2600
x864
1493C
K-beautiful Strings
binary search
,
brute force
,
constructive algorithms
,
greedy
,
strings
2000
x4459
1481A
Space Navigation
greedy
,
strings
800
x24662
1480A
Yet Another String Game
games
,
greedy
,
strings
800
x25439
1476E
Pattern Matching
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
sortings
,
strings
2300
x2246
1473D
Program
data structures
,
dp
,
implementation
,
strings
1700
x9327
1473B
String LCM
brute force
,
math
,
number theory
,
strings
1000
x29729
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1855
1466G
Song of the Sirens
combinatorics
,
divide and conquer
,
hashing
,
math
,
string suffix structures
,
strings
2600
x849
1466C
Canine poetry
dp
,
greedy
,
strings
1300
x17319
1462B
Last Year's Substring
dp
,
implementation
,
strings
800
x26582
1451C
String Equality
dp
,
greedy
,
hashing
,
implementation
,
strings
1400
x15216
1451B
Non-Substring Subsequence
dp
,
greedy
,
implementation
,
strings
900
x19008
1446B
Catching Cheaters
dp
,
strings
1800
x7549
1437G
Death DBMS
data structures
,
string suffix structures
,
strings
,
trees
2600
x952
1431I
Cyclic Shifts
*special problem
,
strings
2900
x42
1430E
String Reversal
data structures
,
greedy
,
strings
1900
x6171
1428C
ABBB
brute force
,
data structures
,
greedy
,
strings
1100
x19683
1426F
Number of Subsequences
combinatorics
,
dp
,
strings
2000
x5118
1422E
Minlexes
dp
,
greedy
,
implementation
,
strings
2700
x730
1421C
Palindromifier
constructive algorithms
,
strings
1400
x12491
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x4184
1411E
Poman Numbers
bitmasks
,
greedy
,
math
,
strings
2300
x1556
1411D
Grime Zoo
brute force
,
greedy
,
implementation
,
strings
2100
x2427
1409F
Subsequences of Length Two
dp
,
strings
2100
x4273
1404A
Balanced Bitstring
implementation
,
strings
1500
x14787
1400F
x-prime Substrings
brute force
,
dfs and similar
,
dp
,
string suffix structures
,
strings
2800
x785
1400A
String Similarity
constructive algorithms
,
strings
800
x26557
1397A
Juggling Letters
greedy
,
strings
800
x28126
1394E
Boboniu and Banknote Collection
strings
3500
x129
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x350
1393E1
Twilight and Ancient Scroll (easier version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x371
1384A
Common Prefixes
constructive algorithms
,
greedy
,
strings
1200
x18385
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x10238
1381A2
Prefix Flip (Hard Version)
constructive algorithms
,
data structures
,
implementation
,
strings
,
two pointers
1700
x12758
1381A1
Prefix Flip (Easy Version)
constructive algorithms
,
data structures
,
strings
1300
x19848
1379A
Acacius and String
brute force
,
implementation
,
strings
1500
x11605
1374C
Move Brackets
greedy
,
strings
1000
x43502
1369B
AccurateLee
greedy
,
implementation
,
strings
1200
x23769
1368B
Codeforces Subsequences
brute force
,
constructive algorithms
,
greedy
,
math
,
strings
1500
x19051
1367A
Short Substrings
implementation
,
strings
800
x54936
1366G
Construct the String
data structures
,
dp
,
strings
2700
x532
1363F
Rotating Substrings
dp
,
strings
2600
x1282
1363B
Subsequence Hate
implementation
,
strings
1400
x22905
1360F
Spy-string
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
hashing
,
strings
1700
x11869
1348C
Phoenix and Distribution
constructive algorithms
,
greedy
,
sortings
,
strings
1600
x14192
1342B
Binary Period
constructive algorithms
,
strings
1100
x23152
1336C
Kaavi and Magic Spell
dp
,
strings
2200
x3335
1332C
K-Complete Word
dfs and similar
,
dsu
,
greedy
,
implementation
,
strings
1500
x15687
1331F
Elementary!
*special problem
,
brute force
,
dp
,
strings
x554
1326D2
Prefix-Suffix Palindrome (Hard version)
binary search
,
greedy
,
hashing
,
string suffix structures
,
strings
1800
x9611
1326D1
Prefix-Suffix Palindrome (Easy version)
hashing
,
string suffix structures
,
strings
1500
x11662
1324B
Yet Another Palindrome Problem
brute force
,
strings
1100
x27502
1321C
Remove Adjacent
brute force
,
constructive algorithms
,
greedy
,
strings
1600
x9511
1320D
Reachable Strings
data structures
,
hashing
,
strings
2500
x1253
1316B
String Modification
brute force
,
constructive algorithms
,
implementation
,
sortings
,
strings
1400
x10992
1315B
Homecoming
binary search
,
dp
,
greedy
,
strings
1300
x8962
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x514
1310C
Au Pont Rouge
binary search
,
dp
,
strings
2800
x466
1307C
Cow and Message
brute force
,
dp
,
math
,
strings
1500
x11548
1305B
Kuroni and Simple Strings
constructive algorithms
,
greedy
,
strings
,
two pointers
1200
x11382
1304B
Longest Palindrome
brute force
,
constructive algorithms
,
greedy
,
implementation
,
strings
1100
x17441
1303E
Erase Subsequences
dp
,
strings
2200
x2567
1303A
Erasing Zeroes
implementation
,
strings
800
x30569
1301C
Ayoub's function
binary search
,
combinatorics
,
greedy
,
math
,
strings
1700
x9058
1301A
Three Strings
implementation
,
strings
800
x19064
1297H
Paint the String
*special problem
,
dp
,
strings
x40
1295C
Obtain The String
dp
,
greedy
,
strings
1600
x12558
1295B
Infinite Prefixes
math
,
strings
1700
x9073
1291A
Even But Not Even
greedy
,
math
,
strings
900
x19053
1290B
Irreducible Anagrams
binary search
,
constructive algorithms
,
data structures
,
strings
,
two pointers
1800
x4929
1286E
Fedya the Potter Strikes Back
data structures
,
strings
3200
x489
1285D
Dr. Evil Underscores
bitmasks
,
brute force
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
strings
,
trees
1900
x7346
1284A
New Year and Naming
implementation
,
strings
800
x17772
1282D
Enchanted Artifact
constructive algorithms
,
interactive
,
strings
2300
x2062
1278A
Shuffle Hashing
brute force
,
implementation
,
strings
1000
x15724
1272F
Two Bracket Sequences
dp
,
strings
,
two pointers
2200
x1757
1270F
Awesome Substrings
math
,
strings
2600
x1103
1268A
Long Beautiful Integer
constructive algorithms
,
greedy
,
implementation
,
strings
1700
x8290
1267L
Lexicography
constructive algorithms
,
strings
1800
x2849
1257C
Dominated Subarray
greedy
,
implementation
,
sortings
,
strings
,
two pointers
1200
x15602
1256F
Equalizing Two Strings
constructive algorithms
,
sortings
,
strings
2000
x3071
1252D
Find String in a Grid
data structures
,
dp
,
strings
,
trees
3000
x325
1251B
Binary Palindromes
greedy
,
strings
1400
x10728
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