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Educational Codeforces Round 165 (Rated for Div. 2)
26:17:49
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Difficulty:
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data structures
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
1859D
Andrey and Escape from Capygrad
binary search
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1800
x6512
91B
Queue
binary search
,
data structures
1500
x6504
283A
Cows and Sequence
constructive algorithms
,
data structures
,
implementation
1600
x6469
1822G1
Magic Triples (Easy Version)
brute force
,
data structures
,
math
,
number theory
1700
x6454
514C
Watto and Mechanism
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2000
x6448
1000C
Covered Points Count
data structures
,
implementation
,
sortings
1700
x6420
1608C
Game Master
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
two pointers
1700
x6410
1930C
Lexicographically Largest
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
1700
x6332
1579E2
Array Optimization by Deque
data structures
,
greedy
1700
x6332
1413D
Shurikens
data structures
,
greedy
,
implementation
1700
x6329
1864D
Matrix Cascade
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
1700
x6309
1073D
Berland Fair
binary search
,
brute force
,
data structures
,
greedy
1700
x6307
777C
Alyona and Spreadsheet
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
two pointers
1600
x6275
519D
A and B and Interesting Substrings
data structures
,
dp
,
two pointers
1800
x6269
797C
Minimal string
data structures
,
greedy
,
strings
1700
x6242
920F
SUM and REPLACE
brute force
,
data structures
,
dsu
,
number theory
2000
x6196
622C
Not Equal on a Segment
data structures
,
implementation
1700
x6181
375D
Tree and Queries
data structures
,
dfs and similar
,
trees
2400
x6179
1562D1
Two Hundred Twenty One (easy version)
data structures
,
dp
,
math
1700
x6178
1648B
Integral Array
brute force
,
constructive algorithms
,
data structures
,
math
1800
x6173
1611F
ATM and Students
binary search
,
data structures
,
two pointers
1800
x6162
519E
A and B and Lecture Rooms
binary search
,
data structures
,
dfs and similar
,
dp
,
trees
2100
x6162
482B
Interesting Array
constructive algorithms
,
data structures
,
trees
1800
x6153
1430E
String Reversal
data structures
,
greedy
,
strings
1900
x6148
1313C2
Skyscrapers (hard version)
data structures
,
dp
,
greedy
1900
x6148
1388D
Captain Flint and Treasure
data structures
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2000
x6118
1227D1
Optimal Subsequences (Easy Version)
data structures
,
greedy
1600
x6118
383C
Propagating tree
data structures
,
dfs and similar
,
trees
2000
x6076
208E
Blood Cousins
binary search
,
data structures
,
dfs and similar
,
trees
2100
x6054
460C
Present
binary search
,
data structures
,
greedy
1700
x6033
1154E
Two Teams
data structures
,
implementation
,
sortings
1800
x6022
1307D
Cow and Fields
binary search
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
sortings
1900
x6015
1734D
Slime Escape
data structures
,
dp
,
greedy
,
two pointers
1800
x6000
1066E
Binary Numbers AND Sum
data structures
,
implementation
,
math
1700
x5992
222B
Cosmic Tables
data structures
,
implementation
1300
x5978
696A
Lorenzo Von Matterhorn
brute force
,
data structures
,
implementation
,
trees
1500
x5973
518C
Anya and Smartphone
constructive algorithms
,
data structures
,
implementation
1600
x5919
1792D
Fixed Prefix Permutations
binary search
,
bitmasks
,
data structures
,
hashing
,
math
,
sortings
1700
x5862
1342D
Multiple Testcases
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
1900
x5828
1923D
Slimes
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x5797
1041D
Glider
binary search
,
data structures
,
two pointers
1700
x5791
1801B
Buying gifts
data structures
,
greedy
,
sortings
1800
x5777
920E
Connected Components?
data structures
,
dfs and similar
,
dsu
,
graphs
2100
x5768
776C
Molly's Chemicals
binary search
,
brute force
,
data structures
,
implementation
,
math
1800
x5740
1042D
Petya and Array
data structures
,
divide and conquer
,
two pointers
1800
x5707
573B
Bear and Blocks
binary search
,
data structures
,
dp
,
math
1600
x5684
1399E1
Weights Division (easy version)
data structures
,
dfs and similar
,
greedy
,
trees
2000
x5672
1424G
Years
data structures
,
sortings
1300
x5635
558E
A Simple Task
data structures
,
sortings
,
strings
2300
x5560
1895D
XOR Construction
bitmasks
,
constructive algorithms
,
data structures
,
math
,
string suffix structures
,
trees
1900
x5534
1707B
Difference Array
brute force
,
data structures
,
implementation
,
sortings
1900
x5524
501C
Misha and Forest
constructive algorithms
,
data structures
,
greedy
,
sortings
,
trees
1500
x5506
1630B
Range and Partition
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x5492
1547F
Array Stabilization (GCD version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
number theory
,
two pointers
1900
x5485
1701D
Permutation Restoration
binary search
,
data structures
,
greedy
,
math
,
sortings
,
two pointers
1900
x5472
1490G
Old Floppy Drive
binary search
,
data structures
,
math
1900
x5463
1691D
Max GEQ Sum
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
implementation
,
two pointers
1800
x5458
343D
Water Tree
data structures
,
dfs and similar
,
graphs
,
trees
2100
x5410
1379C
Choosing flowers
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
two pointers
2000
x5399
786B
Legacy
data structures
,
graphs
,
shortest paths
2300
x5398
1884C
Medium Design
brute force
,
data structures
,
dp
,
greedy
,
sortings
1700
x5394
1561D1
Up the Strip (simplified version)
brute force
,
data structures
,
dp
,
math
,
number theory
1700
x5380
13E
Holes
data structures
,
dsu
2700
x5334
371D
Vessels
data structures
,
dsu
,
implementation
,
trees
1800
x5303
1450D
Rating Compression
binary search
,
data structures
,
greedy
,
implementation
,
two pointers
1800
x5302
1735D
Meta-set
brute force
,
combinatorics
,
data structures
,
hashing
,
math
1700
x5266
383A
Milking cows
data structures
,
greedy
1600
x5196
1083A
The Fair Nut and the Best Path
data structures
,
dp
,
trees
1800
x5192
620E
New Year Tree
bitmasks
,
data structures
,
trees
2100
x5170
1696D
Permutation Graph
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
shortest paths
1900
x5163
1922D
Berserk Monsters
brute force
,
data structures
,
dsu
,
implementation
,
math
1900
x5159
1896D
Ones and Twos
binary search
,
data structures
,
divide and conquer
,
math
,
two pointers
1700
x5143
195B
After Training
data structures
,
implementation
,
math
1300
x5119
1009F
Dominant Indices
data structures
,
dsu
,
trees
2300
x5080
914D
Bash and a Tough Math Puzzle
data structures
,
number theory
1900
x5034
938D
Buy a Ticket
data structures
,
graphs
,
shortest paths
2000
x5023
204B
Little Elephant and Cards
binary search
,
data structures
1500
x5003
1400E
Clear the Multiset
data structures
,
divide and conquer
,
dp
,
greedy
2200
x5001
1718A2
Burenka and Traditions (hard version)
data structures
,
dp
,
greedy
1900
x4982
1537E2
Erase and Extend (Hard Version)
binary search
,
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
,
two pointers
2200
x4968
1310A
Recommendations
data structures
,
greedy
,
sortings
1700
x4968
1843F1
Omsk Metro (simple version)
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
1800
x4959
375B
Maximum Submatrix 2
data structures
,
dp
,
implementation
,
sortings
1600
x4950
1290B
Irreducible Anagrams
binary search
,
constructive algorithms
,
data structures
,
strings
,
two pointers
1800
x4907
1304E
1-Trees and Queries
data structures
,
dfs and similar
,
shortest paths
,
trees
2000
x4866
1249D2
Too Many Segments (hard version)
data structures
,
greedy
,
sortings
1800
x4863
1674F
Desktop Rearrangement
data structures
,
greedy
,
implementation
1800
x4857
1739D
Reset K Edges
binary search
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x4855
359D
Pair of Numbers
binary search
,
brute force
,
data structures
,
math
,
two pointers
2000
x4813
1651D
Nearest Excluded Points
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x4804
1601B
Frog Traveler
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
two pointers
1900
x4765
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x4733
1296E2
String Coloring (hard version)
data structures
,
dp
2000
x4723
865D
Buy Low Sell High
constructive algorithms
,
data structures
,
greedy
2400
x4720
1207F
Remainder Problem
brute force
,
data structures
,
implementation
2100
x4714
1208D
Restore Permutation
binary search
,
data structures
,
greedy
,
implementation
1900
x4650
527D
Clique Problem
data structures
,
dp
,
greedy
,
implementation
,
sortings
1800
x4645
567D
One-Dimensional Battle Ships
binary search
,
data structures
,
greedy
,
sortings
1700
x4640
847B
Preparing for Merge Sort
binary search
,
data structures
1600
x4634
1407D
Discrete Centrifugal Jumps
data structures
,
dp
,
graphs
2200
x4617
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