Enter
|
Register
Home
Top
Catalog
Contests
Gym
Problemset
Groups
Rating
Edu
API
Calendar
Help
→ Pay attention
Before contest
Codeforces Round 973 (Div. 2)
13:25:42
Register now »
*has extra registration
→ 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
Add tag
Main
acmsguru
|
Problems
Submit
Status
Standings
Custom test
Problems
#
Name
1598G
The Sum of Good Numbers
hashing
,
math
,
string suffix structures
,
strings
3200
x331
1594C
Make Them Equal
brute force
,
greedy
,
math
,
strings
1200
x19291
1584F
Strange LCS
bitmasks
,
dp
,
graphs
,
greedy
,
strings
2600
x926
1582C
Grandma Capa Knits a Scarf
brute force
,
data structures
,
greedy
,
strings
,
two pointers
1200
x15511
1579A
Casimir's String Solitaire
math
,
strings
800
x38731
1578H
Higher Order Functions
implementation
,
strings
1700
x2022
1575H
Holiday Wall Ornaments
dp
,
strings
2200
x611
1575A
Another Sorting Problem
data structures
,
sortings
,
strings
1100
x4442
1567A
Domino Disaster
implementation
,
strings
800
x30035
1562E
Rescue Niwen!
dp
,
greedy
,
string suffix structures
,
strings
2500
x1403
1560E
Polycarp and String Transformation
binary search
,
implementation
,
sortings
,
strings
1800
x7945
1560D
Make a Power of Two
greedy
,
math
,
strings
1300
x18152
1555D
Say No to Palindromes
brute force
,
constructive algorithms
,
dp
,
strings
1600
x12324
1554D
Diane
constructive algorithms
,
greedy
,
strings
1800
x9410
1553D
Backspace
dp
,
greedy
,
strings
,
two pointers
1500
x13690
1553B
Reverse String
brute force
,
dp
,
hashing
,
implementation
,
strings
1300
x14117
1552A
Subsequence Permutation
sortings
,
strings
800
x23794
1551C
Interesting Story
greedy
,
sortings
,
strings
1500
x13258
1551B1
Wonderful Coloring - 1
greedy
,
strings
800
x29158
1550E
Stringforces
binary search
,
bitmasks
,
brute force
,
dp
,
strings
,
two pointers
2500
x1526
1547B
Alphabetical Strings
greedy
,
implementation
,
strings
800
x26361
1539B
Love Song
dp
,
implementation
,
strings
800
x24379
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2884
1537E2
Erase and Extend (Hard Version)
binary search
,
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
,
two pointers
2200
x5190
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x12875
1536B
Prinzessin der Verurteilung
brute force
,
constructive algorithms
,
strings
1200
x18677
1535F
String Distance
binary search
,
brute force
,
data structures
,
hashing
,
implementation
,
strings
3000
x451
1535C
Unstable String
binary search
,
dp
,
greedy
,
implementation
,
strings
,
two pointers
1400
x16443
1532F
Prefixes and Suffixes
*special problem
,
strings
x218
1530E
Minimax
constructive algorithms
,
greedy
,
strings
2100
x2962
1526D
Kill Anton
brute force
,
constructive algorithms
,
data structures
,
math
,
strings
2200
x2466
1512C
A-B Palindrome
constructive algorithms
,
implementation
,
strings
1200
x20067
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x431
1511D
Min Cost String
brute force
,
constructive algorithms
,
graphs
,
greedy
,
strings
1600
x11453
1508A
Binary Literature
constructive algorithms
,
greedy
,
implementation
,
strings
,
two pointers
1900
x6213
1506G
Maximize the Remaining String
brute force
,
data structures
,
dp
,
greedy
,
strings
2000
x4292
1506C
Double-ended Strings
brute force
,
implementation
,
strings
1000
x24891
1504A
Déjà Vu
constructive algorithms
,
strings
800
x21658
1499E
Chaotic Merge
combinatorics
,
dp
,
math
,
strings
2400
x1503
1496A
Split it!
brute force
,
constructive algorithms
,
greedy
,
strings
900
x20850
1493E
Enormous XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
,
strings
,
two pointers
2600
x926
1493C
K-beautiful Strings
binary search
,
brute force
,
constructive algorithms
,
greedy
,
strings
2000
x4588
1481A
Space Navigation
greedy
,
strings
800
x24900
1480A
Yet Another String Game
games
,
greedy
,
strings
800
x25810
1476E
Pattern Matching
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
sortings
,
strings
2300
x2336
1473D
Program
data structures
,
dp
,
implementation
,
strings
1700
x9603
1473B
String LCM
brute force
,
math
,
number theory
,
strings
1000
x31256
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1956
1466G
Song of the Sirens
combinatorics
,
divide and conquer
,
hashing
,
math
,
string suffix structures
,
strings
2600
x920
1466C
Canine poetry
dp
,
greedy
,
strings
1300
x17608
1462B
Last Year's Substring
dp
,
implementation
,
strings
800
x27063
1451C
String Equality
dp
,
greedy
,
hashing
,
implementation
,
strings
1400
x15473
1451B
Non-Substring Subsequence
dp
,
greedy
,
implementation
,
strings
900
x19231
1446B
Catching Cheaters
dp
,
strings
1800
x7817
1437G
Death DBMS
data structures
,
string suffix structures
,
strings
,
trees
2600
x999
1431I
Cyclic Shifts
*special problem
,
strings
2900
x46
1430E
String Reversal
data structures
,
greedy
,
strings
1900
x6472
1428C
ABBB
brute force
,
data structures
,
greedy
,
strings
1100
x20169
1426F
Number of Subsequences
combinatorics
,
dp
,
strings
2000
x5325
1422E
Minlexes
dp
,
greedy
,
implementation
,
strings
2700
x742
1421C
Palindromifier
constructive algorithms
,
strings
1400
x12773
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x4399
1411E
Poman Numbers
bitmasks
,
greedy
,
math
,
strings
2300
x1631
1411D
Grime Zoo
brute force
,
greedy
,
implementation
,
strings
2100
x2512
1409F
Subsequences of Length Two
dp
,
strings
2100
x4443
1404A
Balanced Bitstring
implementation
,
strings
1500
x15346
1400F
x-prime Substrings
brute force
,
dfs and similar
,
dp
,
string suffix structures
,
strings
2800
x884
1400A
String Similarity
constructive algorithms
,
strings
800
x26989
1397A
Juggling Letters
greedy
,
strings
800
x28528
1394E
Boboniu and Banknote Collection
strings
3500
x146
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x363
1393E1
Twilight and Ancient Scroll (easier version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x387
1384A
Common Prefixes
constructive algorithms
,
greedy
,
strings
1200
x18753
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x10567
1381A2
Prefix Flip (Hard Version)
constructive algorithms
,
data structures
,
implementation
,
strings
,
two pointers
1700
x13262
1381A1
Prefix Flip (Easy Version)
constructive algorithms
,
data structures
,
strings
1300
x20446
1379A
Acacius and String
brute force
,
implementation
,
strings
1500
x11912
1374C
Move Brackets
greedy
,
strings
1000
x46398
1369B
AccurateLee
greedy
,
implementation
,
strings
1200
x24372
1368B
Codeforces Subsequences
brute force
,
constructive algorithms
,
greedy
,
math
,
strings
1500
x19676
1367A
Short Substrings
implementation
,
strings
800
x57171
1366G
Construct the String
data structures
,
dp
,
strings
2700
x544
1363F
Rotating Substrings
dp
,
strings
2600
x1491
1363B
Subsequence Hate
implementation
,
strings
1400
x23557
1360F
Spy-string
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
hashing
,
strings
1700
x12365
1348C
Phoenix and Distribution
constructive algorithms
,
greedy
,
sortings
,
strings
1600
x14603
1342B
Binary Period
constructive algorithms
,
strings
1100
x23672
1336C
Kaavi and Magic Spell
dp
,
strings
2200
x3586
1332C
K-Complete Word
dfs and similar
,
dsu
,
greedy
,
implementation
,
strings
1500
x16540
1331F
Elementary!
*special problem
,
brute force
,
dp
,
strings
x563
1326D2
Prefix-Suffix Palindrome (Hard version)
binary search
,
greedy
,
hashing
,
string suffix structures
,
strings
1800
x10123
1326D1
Prefix-Suffix Palindrome (Easy version)
hashing
,
string suffix structures
,
strings
1500
x12068
1324B
Yet Another Palindrome Problem
brute force
,
strings
1100
x28286
1321C
Remove Adjacent
brute force
,
constructive algorithms
,
greedy
,
strings
1600
x9803
1320D
Reachable Strings
data structures
,
hashing
,
strings
2500
x1499
1316B
String Modification
brute force
,
constructive algorithms
,
implementation
,
sortings
,
strings
1400
x11256
1315B
Homecoming
binary search
,
dp
,
greedy
,
strings
1300
x9179
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x537
1310C
Au Pont Rouge
binary search
,
dp
,
strings
2800
x520
1307C
Cow and Message
brute force
,
dp
,
math
,
strings
1500
x11803
←
1
2
3
4
5
...
7
8
→
User lists
Name