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Before contest
Codeforces Round (Div. 3)
7 days
→ Filter Problems
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
1553B
Reverse String
brute force
,
dp
,
hashing
,
implementation
,
strings
1300
x13899
1552A
Subsequence Permutation
sortings
,
strings
800
x23594
1551C
Interesting Story
greedy
,
sortings
,
strings
1500
x12991
1551B1
Wonderful Coloring - 1
greedy
,
strings
800
x28790
1550E
Stringforces
binary search
,
bitmasks
,
brute force
,
dp
,
strings
,
two pointers
2500
x1459
1547B
Alphabetical Strings
greedy
,
implementation
,
strings
800
x26064
1539B
Love Song
dp
,
implementation
,
strings
800
x23914
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2829
1537E2
Erase and Extend (Hard Version)
binary search
,
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
,
two pointers
2200
x5042
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x12431
1536B
Prinzessin der Verurteilung
brute force
,
constructive algorithms
,
strings
1200
x17984
1535F
String Distance
binary search
,
brute force
,
data structures
,
hashing
,
implementation
,
strings
3000
x443
1535C
Unstable String
binary search
,
dp
,
greedy
,
implementation
,
strings
,
two pointers
1400
x16195
1532F
Prefixes and Suffixes
*special problem
,
strings
x217
1530E
Minimax
constructive algorithms
,
greedy
,
strings
2100
x2911
1526D
Kill Anton
brute force
,
constructive algorithms
,
data structures
,
math
,
strings
2200
x2363
1512C
A-B Palindrome
constructive algorithms
,
implementation
,
strings
1200
x19620
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x422
1511D
Min Cost String
brute force
,
constructive algorithms
,
graphs
,
greedy
,
strings
1600
x11135
1508A
Binary Literature
constructive algorithms
,
greedy
,
implementation
,
strings
,
two pointers
1900
x6053
1506G
Maximize the Remaining String
brute force
,
data structures
,
dp
,
greedy
,
strings
2000
x4125
1506C
Double-ended Strings
brute force
,
implementation
,
strings
1000
x23778
1504A
Déjà Vu
constructive algorithms
,
strings
800
x21467
1499E
Chaotic Merge
combinatorics
,
dp
,
math
,
strings
2400
x1416
1496A
Split it!
brute force
,
constructive algorithms
,
greedy
,
strings
900
x20380
1493E
Enormous XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
,
strings
,
two pointers
2600
x871
1493C
K-beautiful Strings
binary search
,
brute force
,
constructive algorithms
,
greedy
,
strings
2000
x4482
1481A
Space Navigation
greedy
,
strings
800
x24702
1480A
Yet Another String Game
games
,
greedy
,
strings
800
x25503
1476E
Pattern Matching
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
sortings
,
strings
2300
x2260
1473D
Program
data structures
,
dp
,
implementation
,
strings
1700
x9378
1473B
String LCM
brute force
,
math
,
number theory
,
strings
1000
x30292
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1862
1466G
Song of the Sirens
combinatorics
,
divide and conquer
,
hashing
,
math
,
string suffix structures
,
strings
2600
x855
1466C
Canine poetry
dp
,
greedy
,
strings
1300
x17373
1462B
Last Year's Substring
dp
,
implementation
,
strings
800
x26717
1451C
String Equality
dp
,
greedy
,
hashing
,
implementation
,
strings
1400
x15275
1451B
Non-Substring Subsequence
dp
,
greedy
,
implementation
,
strings
900
x19057
1446B
Catching Cheaters
dp
,
strings
1800
x7608
1437G
Death DBMS
data structures
,
string suffix structures
,
strings
,
trees
2600
x959
1431I
Cyclic Shifts
*special problem
,
strings
2900
x44
1430E
String Reversal
data structures
,
greedy
,
strings
1900
x6297
1428C
ABBB
brute force
,
data structures
,
greedy
,
strings
1100
x19858
1426F
Number of Subsequences
combinatorics
,
dp
,
strings
2000
x5158
1422E
Minlexes
dp
,
greedy
,
implementation
,
strings
2700
x734
1421C
Palindromifier
constructive algorithms
,
strings
1400
x12586
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x4219
1411E
Poman Numbers
bitmasks
,
greedy
,
math
,
strings
2300
x1564
1411D
Grime Zoo
brute force
,
greedy
,
implementation
,
strings
2100
x2439
1409F
Subsequences of Length Two
dp
,
strings
2100
x4303
1404A
Balanced Bitstring
implementation
,
strings
1500
x14937
1400F
x-prime Substrings
brute force
,
dfs and similar
,
dp
,
string suffix structures
,
strings
2800
x795
1400A
String Similarity
constructive algorithms
,
strings
800
x26625
1397A
Juggling Letters
greedy
,
strings
800
x28224
1394E
Boboniu and Banknote Collection
strings
3500
x138
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x353
1393E1
Twilight and Ancient Scroll (easier version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x375
1384A
Common Prefixes
constructive algorithms
,
greedy
,
strings
1200
x18430
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x10271
1381A2
Prefix Flip (Hard Version)
constructive algorithms
,
data structures
,
implementation
,
strings
,
two pointers
1700
x12810
1381A1
Prefix Flip (Easy Version)
constructive algorithms
,
data structures
,
strings
1300
x19919
1379A
Acacius and String
brute force
,
implementation
,
strings
1500
x11634
1374C
Move Brackets
greedy
,
strings
1000
x44127
1369B
AccurateLee
greedy
,
implementation
,
strings
1200
x23864
1368B
Codeforces Subsequences
brute force
,
constructive algorithms
,
greedy
,
math
,
strings
1500
x19176
1367A
Short Substrings
implementation
,
strings
800
x55433
1366G
Construct the String
data structures
,
dp
,
strings
2700
x534
1363F
Rotating Substrings
dp
,
strings
2600
x1331
1363B
Subsequence Hate
implementation
,
strings
1400
x23077
1360F
Spy-string
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
hashing
,
strings
1700
x11969
1348C
Phoenix and Distribution
constructive algorithms
,
greedy
,
sortings
,
strings
1600
x14292
1342B
Binary Period
constructive algorithms
,
strings
1100
x23269
1336C
Kaavi and Magic Spell
dp
,
strings
2200
x3392
1332C
K-Complete Word
dfs and similar
,
dsu
,
greedy
,
implementation
,
strings
1500
x15914
1331F
Elementary!
*special problem
,
brute force
,
dp
,
strings
x558
1326D2
Prefix-Suffix Palindrome (Hard version)
binary search
,
greedy
,
hashing
,
string suffix structures
,
strings
1800
x9709
1326D1
Prefix-Suffix Palindrome (Easy version)
hashing
,
string suffix structures
,
strings
1500
x11731
1324B
Yet Another Palindrome Problem
brute force
,
strings
1100
x27651
1321C
Remove Adjacent
brute force
,
constructive algorithms
,
greedy
,
strings
1600
x9640
1320D
Reachable Strings
data structures
,
hashing
,
strings
2500
x1273
1316B
String Modification
brute force
,
constructive algorithms
,
implementation
,
sortings
,
strings
1400
x11109
1315B
Homecoming
binary search
,
dp
,
greedy
,
strings
1300
x9105
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x522
1310C
Au Pont Rouge
binary search
,
dp
,
strings
2800
x483
1307C
Cow and Message
brute force
,
dp
,
math
,
strings
1500
x11709
1305B
Kuroni and Simple Strings
constructive algorithms
,
greedy
,
strings
,
two pointers
1200
x11601
1304B
Longest Palindrome
brute force
,
constructive algorithms
,
greedy
,
implementation
,
strings
1100
x17611
1303E
Erase Subsequences
dp
,
strings
2200
x2720
1303A
Erasing Zeroes
implementation
,
strings
800
x31107
1301C
Ayoub's function
binary search
,
combinatorics
,
greedy
,
math
,
strings
1700
x9189
1301A
Three Strings
implementation
,
strings
800
x19219
1297H
Paint the String
*special problem
,
dp
,
strings
x42
1295C
Obtain The String
dp
,
greedy
,
strings
1600
x12736
1295B
Infinite Prefixes
math
,
strings
1700
x9228
1291A
Even But Not Even
greedy
,
math
,
strings
900
x19306
1290B
Irreducible Anagrams
binary search
,
constructive algorithms
,
data structures
,
strings
,
two pointers
1800
x5122
1286E
Fedya the Potter Strikes Back
data structures
,
strings
3200
x492
1285D
Dr. Evil Underscores
bitmasks
,
brute force
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
strings
,
trees
1900
x7515
1284A
New Year and Naming
implementation
,
strings
800
x17918
1282D
Enchanted Artifact
constructive algorithms
,
interactive
,
strings
2300
x2214
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