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Before contest
Educational Codeforces Round 150 (Rated for Div. 2)
4 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
Submit
Status
Standings
Custom test
Problems
#
Name
525A
Vitaliy and Pie
greedy
,
hashing
,
strings
1100
x12180
1520D
Same Differences
data structures
,
hashing
,
math
1200
x33410
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x16074
1650C
Weight of the System of Nested Segments
greedy
,
hashing
,
implementation
,
sortings
1200
x14925
4C
Registration System
data structures
,
hashing
,
implementation
1300
x63481
486B
OR in Matrix
greedy
,
hashing
,
implementation
1300
x15154
1553B
Reverse String
brute force
,
dp
,
hashing
,
implementation
,
strings
1300
x12906
1451C
String Equality
dp
,
greedy
,
hashing
,
implementation
,
strings
1400
x14192
182D
Common Divisors
brute force
,
hashing
,
implementation
,
math
,
strings
1400
x7229
2A
Winner
hashing
,
implementation
1500
x21323
1536C
Diluc and Kaeya
data structures
,
dp
,
hashing
,
number theory
1500
x12369
1326D1
Prefix-Suffix Palindrome (Easy version)
hashing
,
string suffix structures
,
strings
1500
x10961
1133D
Zero Quantity Maximization
hashing
,
math
,
number theory
1500
x9603
574B
Bear and Three Musketeers
brute force
,
dfs and similar
,
graphs
,
hashing
1500
x7267
39J
Spelling Check
hashing
,
implementation
,
strings
1500
x2440
1527C
Sequence Pair Weight
hashing
,
implementation
,
math
1600
x11950
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x10970
1137B
Camp Schedule
greedy
,
hashing
,
strings
1600
x5015
733D
Kostya the Sculptor
data structures
,
hashing
1600
x4025
1045I
Palindrome Pairs
hashing
,
strings
1600
x3416
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x15201
1360F
Spy-string
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
hashing
,
strings
1700
x10997
559B
Equivalent Strings
divide and conquer
,
hashing
,
sortings
,
strings
1700
x9643
1681D
Required Length
brute force
,
dfs and similar
,
dp
,
hashing
,
shortest paths
1700
x8150
1731C
Even Subarrays
bitmasks
,
brute force
,
hashing
,
math
,
number theory
1700
x7512
1792D
Fixed Prefix Permutations
binary search
,
bitmasks
,
data structures
,
hashing
,
math
,
sortings
1700
x4886
1735D
Meta-set
brute force
,
combinatorics
,
data structures
,
hashing
,
math
1700
x4682
1468F
Full Turn
geometry
,
hashing
,
number theory
1700
x3282
82B
Sets
constructive algorithms
,
hashing
,
implementation
1700
x1872
316G1
Good Substrings
hashing
,
strings
1700
x858
1326D2
Prefix-Suffix Palindrome (Hard version)
binary search
,
greedy
,
hashing
,
string suffix structures
,
strings
1800
x8690
1500A
Going Home
brute force
,
hashing
,
implementation
,
math
1800
x7987
242C
King's Path
dfs and similar
,
graphs
,
hashing
,
shortest paths
1800
x6979
1225D
Power Products
hashing
,
math
,
number theory
1800
x6472
245H
Queries for Number of Palindromes
dp
,
hashing
,
strings
1800
x4842
1109B
Sasha and One More Name
constructive algorithms
,
hashing
,
strings
1800
x4027
533E
Correcting Mistakes
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x2048
724C
Ray Tracing
greedy
,
hashing
,
implementation
,
math
,
number theory
,
sortings
1800
x1976
79C
Beaver
data structures
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x1619
54B
Cutting Jigsaw Puzzle
hashing
,
implementation
1800
x703
463C
Gargari and Bishops
greedy
,
hashing
,
implementation
1900
x7940
1470B
Strange Definition
bitmasks
,
graphs
,
hashing
,
math
,
number theory
1900
x5762
1228D
Complete Tripartite
brute force
,
constructive algorithms
,
graphs
,
hashing
,
implementation
1900
x4779
1214D
Treasure Island
dfs and similar
,
dp
,
flows
,
hashing
1900
x4631
1704D
Magical Array
constructive algorithms
,
hashing
,
implementation
,
math
1900
x4428
835D
Palindromic characteristics
brute force
,
dp
,
hashing
,
strings
1900
x3569
535D
Tavas and Malekas
greedy
,
hashing
,
string suffix structures
,
strings
1900
x3523
1729F
Kirei and the Linear Function
hashing
,
math
1900
x3520
1277D
Let's Play the Words?
data structures
,
hashing
,
implementation
,
math
1900
x2831
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x2752
633C
Spy Syndrome 2
data structures
,
dp
,
hashing
,
implementation
,
sortings
,
string suffix structures
,
strings
1900
x2374
757C
Felicity is Coming!
data structures
,
hashing
,
sortings
,
strings
1900
x2249
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x5820
514C
Watto and Mechanism
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2000
x5759
1574D
The Strongest Build
binary search
,
brute force
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
hashing
,
implementation
2000
x4005
1624E
Masha-forgetful
brute force
,
constructive algorithms
,
dp
,
hashing
,
implementation
,
strings
2000
x3511
633D
Fibonacci-ish
brute force
,
dp
,
hashing
,
implementation
,
math
2000
x2414
611D
New Year and Ancient Prophecy
dp
,
hashing
,
strings
2000
x2367
113B
Petr#
brute force
,
data structures
,
hashing
,
strings
2000
x2298
291E
Tree-String Problem
*special problem
,
dfs and similar
,
hashing
,
strings
2000
x1193
958A2
Death Stars (medium)
hashing
,
strings
2000
x816
228C
Fractal Detector
dp
,
hashing
2000
x423
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x4241
1284D
New Year and Conference
binary search
,
data structures
,
hashing
,
sortings
2100
x2654
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2581
1671E
Preorder
combinatorics
,
divide and conquer
,
dp
,
dsu
,
hashing
,
sortings
,
trees
2100
x2379
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2264
762C
Two strings
binary search
,
hashing
,
strings
,
two pointers
2100
x2191
631D
Messenger
data structures
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x1880
1729G
Cut Substrings
combinatorics
,
dp
,
hashing
,
strings
,
two pointers
2100
x1774
1056E
Check Transcription
brute force
,
data structures
,
hashing
,
strings
2100
x1646
190E
Counter Attack
data structures
,
dsu
,
graphs
,
hashing
,
sortings
2100
x1253
1537E2
Erase and Extend (Hard Version)
binary search
,
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
,
two pointers
2200
x4447
7D
Palindrome Degree
hashing
,
strings
2200
x3057
486E
LIS of Sequence
data structures
,
dp
,
greedy
,
hashing
,
math
2200
x1858
526D
Om Nom and Necklace
hashing
,
string suffix structures
,
strings
2200
x1852
25E
Test
hashing
,
strings
2200
x1729
1721E
Prefix Function Queries
dfs and similar
,
dp
,
hashing
,
string suffix structures
,
strings
,
trees
2200
x1536
1800G
Symmetree
dfs and similar
,
hashing
,
implementation
,
trees
2200
x1448
567E
President and Roads
dfs and similar
,
graphs
,
hashing
,
shortest paths
2200
x1441
903E
Swapping Characters
brute force
,
hashing
,
implementation
,
strings
2200
x1177
639C
Bear and Polynomials
hashing
,
implementation
,
math
2200
x1145
19C
Deletion of Repeats
greedy
,
hashing
,
string suffix structures
2200
x969
1003F
Abbreviation
dp
,
hashing
,
strings
2200
x965
1773B
BinCoin
binary search
,
divide and conquer
,
hashing
,
implementation
,
probabilities
,
trees
2200
x580
65D
Harry Potter and the Sorting Hat
brute force
,
dfs and similar
,
hashing
2200
x398
154C
Double Profiles
graphs
,
hashing
,
sortings
2300
x2326
1476E
Pattern Matching
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
sortings
,
strings
2300
x1983
1322C
Instant Noodles
graphs
,
hashing
,
math
,
number theory
2300
x1814
1394B
Boboniu Walks on Graph
brute force
,
dfs and similar
,
graphs
,
hashing
2300
x1668
985F
Isomorphic Strings
hashing
,
strings
2300
x1518
425D
Sereja and Squares
binary search
,
data structures
,
hashing
2300
x1302
877F
Ann and Books
data structures
,
flows
,
hashing
2300
x1271
898F
Restoring the Expression
brute force
,
hashing
,
math
2300
x1022
727E
Games on a CD
data structures
,
hashing
,
string suffix structures
,
strings
2300
x974
856B
Similar Words
dp
,
hashing
,
strings
,
trees
2300
x455
212B
Polycarpus is Looking for Good Substrings
bitmasks
,
hashing
,
implementation
2300
x308
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1701
1257F
Make Them Similar
bitmasks
,
brute force
,
hashing
,
meet-in-the-middle
2400
x1666
467D
Fedor and Essay
dfs and similar
,
dp
,
graphs
,
hashing
,
strings
2400
x1573
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