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Before contest
Codeforces Round #792 (Div. 1)
3 days
Before contest
Codeforces Round #792 (Div. 2)
3 days
→ Filter Problems
Difficulty:
—
hashing
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
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Status
Standings
Custom test
Problems
#
Name
525A
Vitaliy and Pie
greedy
,
hashing
,
strings
1100
x10550
1520D
Same Differences
data structures
,
hashing
,
math
1200
x25043
1650C
Weight of the System of Nested Segments
greedy
,
hashing
,
implementation
,
sortings
1200
x12561
4C
Registration System
data structures
,
hashing
,
implementation
1300
x48869
486B
OR in Matrix
greedy
,
hashing
,
implementation
1300
x13340
1553B
Reverse String
brute force
,
dp
,
hashing
,
implementation
,
strings
1300
x11241
1451C
String Equality
dp
,
greedy
,
hashing
,
implementation
,
strings
1400
x12606
182D
Common Divisors
brute force
,
hashing
,
implementation
,
math
,
strings
1400
x6450
2A
Winner
hashing
,
implementation
1500
x17580
1536C
Diluc and Kaeya
data structures
,
dp
,
hashing
,
number theory
1500
x10719
1326D1
Prefix-Suffix Palindrome (Easy version)
hashing
,
string suffix structures
,
strings
1500
x10104
1133D
Zero Quantity Maximization
hashing
,
math
,
number theory
1500
x8684
574B
Bear and Three Musketeers
brute force
,
dfs and similar
,
graphs
,
hashing
1500
x6806
39J
Spelling Check
hashing
,
implementation
,
strings
1500
x2159
1527C
Sequence Pair Weight
hashing
,
implementation
,
math
1600
x10408
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x9356
1137B
Camp Schedule
greedy
,
hashing
,
strings
1600
x4551
733D
Kostya the Sculptor
data structures
,
hashing
1600
x3835
1045I
Palindrome Pairs
hashing
,
strings
1600
x2877
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x12620
1360F
Spy-string
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
hashing
,
strings
1700
x9942
559B
Equivalent Strings
divide and conquer
,
hashing
,
sortings
,
strings
1700
x8996
1468F
Full Turn
geometry
,
hashing
,
number theory
1700
x2903
82B
Sets
constructive algorithms
,
hashing
,
implementation
1700
x1736
316G1
Good Substrings
hashing
,
strings
1700
x818
1326D2
Prefix-Suffix Palindrome (Hard version)
binary search
,
greedy
,
hashing
,
string suffix structures
,
strings
1800
x7724
1500A
Going Home
brute force
,
hashing
,
implementation
,
math
1800
x7222
242C
King's Path
dfs and similar
,
graphs
,
hashing
,
shortest paths
1800
x5712
1225D
Power Products
hashing
,
math
,
number theory
1800
x5495
1109B
Sasha and One More Name
constructive algorithms
,
hashing
,
strings
1800
x3854
245H
Queries for Number of Palindromes
dp
,
hashing
,
strings
1800
x3721
533E
Correcting Mistakes
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x1935
724C
Ray Tracing
greedy
,
hashing
,
implementation
,
math
,
number theory
,
sortings
1800
x1847
79C
Beaver
data structures
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x1463
54B
Cutting Jigsaw Puzzle
hashing
,
implementation
1800
x646
463C
Gargari and Bishops
greedy
,
hashing
,
implementation
1900
x7274
1470B
Strange Definition
bitmasks
,
graphs
,
hashing
,
math
,
number theory
1900
x5264
1228D
Complete Tripartite
brute force
,
constructive algorithms
,
graphs
,
hashing
,
implementation
1900
x4552
1214D
Treasure Island
dfs and similar
,
dp
,
flows
,
hashing
1900
x4307
535D
Tavas and Malekas
greedy
,
hashing
,
string suffix structures
,
strings
1900
x3223
835D
Palindromic characteristics
brute force
,
dp
,
hashing
,
strings
1900
x2995
1277D
Let's Play the Words?
data structures
,
hashing
,
implementation
,
math
1900
x2661
757C
Felicity is Coming!
data structures
,
hashing
,
sortings
,
strings
1900
x2180
633C
Spy Syndrome 2
data structures
,
dp
,
hashing
,
implementation
,
sortings
,
string suffix structures
,
strings
1900
x2141
514C
Watto and Mechanism
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2000
x4996
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x4625
1574D
The Strongest Build
binary search
,
brute force
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
hashing
,
implementation
2000
x3619
1624E
Masha-forgetful
brute force
,
constructive algorithms
,
dp
,
hashing
,
implementation
,
strings
2000
x2921
611D
New Year and Ancient Prophecy
dp
,
hashing
,
strings
2000
x2252
633D
Fibonacci-ish
brute force
,
dp
,
hashing
,
implementation
,
math
2000
x2188
113B
Petr#
brute force
,
data structures
,
hashing
,
strings
2000
x2050
291E
Tree-String Problem
*special problem
,
dfs and similar
,
hashing
,
strings
2000
x1119
958A2
Death Stars (medium)
hashing
,
strings
2000
x757
228C
Fractal Detector
dp
,
hashing
2000
x411
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x3724
1284D
New Year and Conference
binary search
,
data structures
,
hashing
,
sortings
2100
x2486
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2309
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2071
762C
Two strings
binary search
,
hashing
,
strings
,
two pointers
2100
x1971
631D
Messenger
data structures
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x1764
1671E
Preorder
combinatorics
,
divide and conquer
,
dp
,
dsu
,
hashing
,
sortings
,
trees
2100
x1695
1056E
Check Transcription
brute force
,
data structures
,
hashing
,
strings
2100
x1408
190E
Counter Attack
data structures
,
dsu
,
graphs
,
hashing
,
sortings
2100
x1109
1537E2
Erase and Extend (Hard Version)
binary search
,
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
,
two pointers
2200
x3842
7D
Palindrome Degree
hashing
,
strings
2200
x2639
486E
LIS of Sequence
data structures
,
dp
,
greedy
,
hashing
,
math
2200
x1657
526D
Om Nom and Necklace
hashing
,
string suffix structures
,
strings
2200
x1611
25E
Test
hashing
,
strings
2200
x1510
567E
President and Roads
dfs and similar
,
graphs
,
hashing
,
shortest paths
2200
x1290
639C
Bear and Polynomials
hashing
,
implementation
,
math
2200
x1111
903E
Swapping Characters
brute force
,
hashing
,
implementation
,
strings
2200
x1073
1003F
Abbreviation
dp
,
hashing
,
strings
2200
x858
19C
Deletion of Repeats
greedy
,
hashing
,
string suffix structures
2200
x823
65D
Harry Potter and the Sorting Hat
brute force
,
dfs and similar
,
hashing
2200
x373
154C
Double Profiles
graphs
,
hashing
,
sortings
2300
x1961
1476E
Pattern Matching
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
sortings
,
strings
2300
x1825
1322C
Instant Noodles
graphs
,
hashing
,
math
,
number theory
2300
x1589
1394B
Boboniu Walks on Graph
brute force
,
dfs and similar
,
graphs
,
hashing
2300
x1583
985F
Isomorphic Strings
hashing
,
strings
2300
x1290
425D
Sereja and Squares
binary search
,
data structures
,
hashing
2300
x1203
877F
Ann and Books
data structures
,
flows
,
hashing
2300
x977
898F
Restoring the Expression
brute force
,
hashing
,
math
2300
x916
727E
Games on a CD
data structures
,
hashing
,
string suffix structures
,
strings
2300
x807
856B
Similar Words
dp
,
hashing
,
strings
,
trees
2300
x407
212B
Polycarpus is Looking for Good Substrings
bitmasks
,
hashing
,
implementation
2300
x297
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1552
1257F
Make Them Similar
bitmasks
,
brute force
,
hashing
,
meet-in-the-middle
2400
x1532
467D
Fedor and Essay
dfs and similar
,
dp
,
graphs
,
hashing
,
strings
2400
x1470
1494E
A-Z Graph
constructive algorithms
,
data structures
,
graphs
,
hashing
2400
x1345
869E
The Untended Antiquity
data structures
,
hashing
2400
x1098
710F
String Set Queries
brute force
,
data structures
,
hashing
,
interactive
,
string suffix structures
,
strings
2400
x1004
601D
Acyclic Organic Compounds
data structures
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2400
x927
825F
String Compression
dp
,
hashing
,
string suffix structures
,
strings
2400
x915
533F
Encoding
hashing
,
string suffix structures
,
strings
2400
x768
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x754
794D
Labelling Cities
dfs and similar
,
graphs
,
hashing
2400
x674
1017E
The Supersonic Rocket
geometry
,
hashing
,
strings
2400
x670
1182D
Complete Mirror
constructive algorithms
,
dfs and similar
,
dp
,
hashing
,
implementation
,
trees
2400
x655
1252F
Regular Forestation
hashing
,
trees
2400
x649
822E
Liar
binary search
,
dp
,
hashing
,
string suffix structures
2400
x542
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