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Codeforces Round 964 (Div. 4)
02:37:42
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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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Problems
#
Name
1560E
Polycarp and String Transformation
binary search
,
implementation
,
sortings
,
strings
1800
x7876
1560D
Make a Power of Two
greedy
,
math
,
strings
1300
x17995
1555D
Say No to Palindromes
brute force
,
constructive algorithms
,
dp
,
strings
1600
x12148
1554D
Diane
constructive algorithms
,
greedy
,
strings
1800
x9288
1553D
Backspace
dp
,
greedy
,
strings
,
two pointers
1500
x13572
1553B
Reverse String
brute force
,
dp
,
hashing
,
implementation
,
strings
1300
x14023
1552A
Subsequence Permutation
sortings
,
strings
800
x23708
1551C
Interesting Story
greedy
,
sortings
,
strings
1500
x13126
1551B1
Wonderful Coloring - 1
greedy
,
strings
800
x29007
1550E
Stringforces
binary search
,
bitmasks
,
brute force
,
dp
,
strings
,
two pointers
2500
x1492
1547B
Alphabetical Strings
greedy
,
implementation
,
strings
800
x26218
1539B
Love Song
dp
,
implementation
,
strings
800
x24227
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2860
1537E2
Erase and Extend (Hard Version)
binary search
,
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
,
two pointers
2200
x5116
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x12703
1536B
Prinzessin der Verurteilung
brute force
,
constructive algorithms
,
strings
1200
x18368
1535F
String Distance
binary search
,
brute force
,
data structures
,
hashing
,
implementation
,
strings
3000
x448
1535C
Unstable String
binary search
,
dp
,
greedy
,
implementation
,
strings
,
two pointers
1400
x16334
1532F
Prefixes and Suffixes
*special problem
,
strings
x218
1530E
Minimax
constructive algorithms
,
greedy
,
strings
2100
x2937
1526D
Kill Anton
brute force
,
constructive algorithms
,
data structures
,
math
,
strings
2200
x2387
1512C
A-B Palindrome
constructive algorithms
,
implementation
,
strings
1200
x19869
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x424
1511D
Min Cost String
brute force
,
constructive algorithms
,
graphs
,
greedy
,
strings
1600
x11290
1508A
Binary Literature
constructive algorithms
,
greedy
,
implementation
,
strings
,
two pointers
1900
x6131
1506G
Maximize the Remaining String
brute force
,
data structures
,
dp
,
greedy
,
strings
2000
x4235
1506C
Double-ended Strings
brute force
,
implementation
,
strings
1000
x24384
1504A
Déjà Vu
constructive algorithms
,
strings
800
x21579
1499E
Chaotic Merge
combinatorics
,
dp
,
math
,
strings
2400
x1492
1496A
Split it!
brute force
,
constructive algorithms
,
greedy
,
strings
900
x20583
1493E
Enormous XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
,
strings
,
two pointers
2600
x887
1493C
K-beautiful Strings
binary search
,
brute force
,
constructive algorithms
,
greedy
,
strings
2000
x4523
1481A
Space Navigation
greedy
,
strings
800
x24831
1480A
Yet Another String Game
games
,
greedy
,
strings
800
x25713
1476E
Pattern Matching
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
sortings
,
strings
2300
x2294
1473D
Program
data structures
,
dp
,
implementation
,
strings
1700
x9522
1473B
String LCM
brute force
,
math
,
number theory
,
strings
1000
x30861
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1940
1466G
Song of the Sirens
combinatorics
,
divide and conquer
,
hashing
,
math
,
string suffix structures
,
strings
2600
x908
1466C
Canine poetry
dp
,
greedy
,
strings
1300
x17513
1462B
Last Year's Substring
dp
,
implementation
,
strings
800
x26964
1451C
String Equality
dp
,
greedy
,
hashing
,
implementation
,
strings
1400
x15394
1451B
Non-Substring Subsequence
dp
,
greedy
,
implementation
,
strings
900
x19165
1446B
Catching Cheaters
dp
,
strings
1800
x7749
1437G
Death DBMS
data structures
,
string suffix structures
,
strings
,
trees
2600
x968
1431I
Cyclic Shifts
*special problem
,
strings
2900
x45
1430E
String Reversal
data structures
,
greedy
,
strings
1900
x6392
1428C
ABBB
brute force
,
data structures
,
greedy
,
strings
1100
x20039
1426F
Number of Subsequences
combinatorics
,
dp
,
strings
2000
x5249
1422E
Minlexes
dp
,
greedy
,
implementation
,
strings
2700
x735
1421C
Palindromifier
constructive algorithms
,
strings
1400
x12697
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x4327
1411E
Poman Numbers
bitmasks
,
greedy
,
math
,
strings
2300
x1626
1411D
Grime Zoo
brute force
,
greedy
,
implementation
,
strings
2100
x2501
1409F
Subsequences of Length Two
dp
,
strings
2100
x4381
1404A
Balanced Bitstring
implementation
,
strings
1500
x15165
1400F
x-prime Substrings
brute force
,
dfs and similar
,
dp
,
string suffix structures
,
strings
2800
x814
1400A
String Similarity
constructive algorithms
,
strings
800
x26851
1397A
Juggling Letters
greedy
,
strings
800
x28380
1394E
Boboniu and Banknote Collection
strings
3500
x140
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x359
1393E1
Twilight and Ancient Scroll (easier version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x381
1384A
Common Prefixes
constructive algorithms
,
greedy
,
strings
1200
x18680
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x10521
1381A2
Prefix Flip (Hard Version)
constructive algorithms
,
data structures
,
implementation
,
strings
,
two pointers
1700
x13172
1381A1
Prefix Flip (Easy Version)
constructive algorithms
,
data structures
,
strings
1300
x20326
1379A
Acacius and String
brute force
,
implementation
,
strings
1500
x11867
1374C
Move Brackets
greedy
,
strings
1000
x45358
1369B
AccurateLee
greedy
,
implementation
,
strings
1200
x24205
1368B
Codeforces Subsequences
brute force
,
constructive algorithms
,
greedy
,
math
,
strings
1500
x19511
1367A
Short Substrings
implementation
,
strings
800
x56529
1366G
Construct the String
data structures
,
dp
,
strings
2700
x539
1363F
Rotating Substrings
dp
,
strings
2600
x1475
1363B
Subsequence Hate
implementation
,
strings
1400
x23392
1360F
Spy-string
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
hashing
,
strings
1700
x12245
1348C
Phoenix and Distribution
constructive algorithms
,
greedy
,
sortings
,
strings
1600
x14530
1342B
Binary Period
constructive algorithms
,
strings
1100
x23591
1336C
Kaavi and Magic Spell
dp
,
strings
2200
x3551
1332C
K-Complete Word
dfs and similar
,
dsu
,
greedy
,
implementation
,
strings
1500
x16322
1331F
Elementary!
*special problem
,
brute force
,
dp
,
strings
x561
1326D2
Prefix-Suffix Palindrome (Hard version)
binary search
,
greedy
,
hashing
,
string suffix structures
,
strings
1800
x10010
1326D1
Prefix-Suffix Palindrome (Easy version)
hashing
,
string suffix structures
,
strings
1500
x11994
1324B
Yet Another Palindrome Problem
brute force
,
strings
1100
x28047
1321C
Remove Adjacent
brute force
,
constructive algorithms
,
greedy
,
strings
1600
x9772
1320D
Reachable Strings
data structures
,
hashing
,
strings
2500
x1431
1316B
String Modification
brute force
,
constructive algorithms
,
implementation
,
sortings
,
strings
1400
x11217
1315B
Homecoming
binary search
,
dp
,
greedy
,
strings
1300
x9155
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x531
1310C
Au Pont Rouge
binary search
,
dp
,
strings
2800
x497
1307C
Cow and Message
brute force
,
dp
,
math
,
strings
1500
x11759
1305B
Kuroni and Simple Strings
constructive algorithms
,
greedy
,
strings
,
two pointers
1200
x11680
1304B
Longest Palindrome
brute force
,
constructive algorithms
,
greedy
,
implementation
,
strings
1100
x17776
1303E
Erase Subsequences
dp
,
strings
2200
x2769
1303A
Erasing Zeroes
implementation
,
strings
800
x31652
1301C
Ayoub's function
binary search
,
combinatorics
,
greedy
,
math
,
strings
1700
x9279
1301A
Three Strings
implementation
,
strings
800
x19291
1297H
Paint the String
*special problem
,
dp
,
strings
x43
1295C
Obtain The String
dp
,
greedy
,
strings
1600
x12829
1295B
Infinite Prefixes
math
,
strings
1700
x9274
1291A
Even But Not Even
greedy
,
math
,
strings
900
x19458
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