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Before contest
Educational Codeforces Round 167 (Rated for Div. 2)
36:30:23
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Difficulty:
—
dp
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
671D
Roads in Yusland
data structures
,
dp
,
greedy
2900
x1116
665F
Four Divisors
data structures
,
dp
,
math
,
number theory
,
sortings
,
two pointers
2400
x586
662E
To Hack or not to Hack
brute force
,
dp
,
greedy
3100
x134
662C
Binary Table
bitmasks
,
brute force
,
divide and conquer
,
dp
,
fft
,
math
2600
x1970
659G
Fence Divercity
combinatorics
,
dp
,
number theory
2300
x988
650D
Zip-line
binary search
,
data structures
,
dp
,
hashing
2600
x1246
650C
Table Compression
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
2200
x1947
645E
Intellectual Inquiry
dp
,
greedy
,
strings
2200
x1227
643F
Bears and Juice
dp
,
math
,
meet-in-the-middle
2900
x695
643E
Bear and Destroying Subtrees
dp
,
math
,
probabilities
,
trees
2700
x584
643C
Levels and Regions
dp
2400
x1324
641D
Little Artem and Random Variable
dp
,
implementation
,
math
,
probabilities
2400
x1048
633F
The Chocolate Spree
dfs and similar
,
dp
,
graphs
,
trees
2600
x913
632E
Thief in a Shop
divide and conquer
,
dp
,
fft
,
math
2400
x2626
631E
Product Sum
data structures
,
dp
,
geometry
2600
x2263
629E
Famil Door and Roads
combinatorics
,
data structures
,
dfs and similar
,
dp
,
probabilities
,
trees
2300
x975
628D
Magic Numbers
dp
2200
x5552
627D
Preorder Test
binary search
,
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2600
x808
626G
Raffles
data structures
,
dp
,
greedy
,
math
3100
x520
626F
Group Projects
dp
2400
x2719
623E
Transforming Sequence
combinatorics
,
dp
,
fft
,
math
3300
x536
623C
Electric Charges
binary search
,
dp
2900
x450
623B
Array GCD
dp
,
greedy
,
number theory
2300
x2055
618G
Combining Slimes
dp
,
math
,
matrices
,
probabilities
3300
x232
618D
Hamiltonian Spanning Tree
dfs and similar
,
dp
,
graph matchings
,
greedy
,
trees
2200
x1700
613E
Puzzle Lover
dp
,
hashing
,
strings
3200
x457
613D
Kingdom and its Cities
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
sortings
,
trees
2800
x2735
612F
Simba on the Circle
dp
2600
x375
601E
A Museum Robbery
data structures
,
dp
2800
x817
601C
Kleofáš and the n-thlon
dp
,
math
,
probabilities
2300
x1292
599E
Sandy and Nuts
bitmasks
,
dp
,
trees
2600
x626
596E
Wilbur and Strings
dfs and similar
,
dp
,
graphs
,
strings
2500
x390
596D
Wilbur and Trees
dp
,
math
,
probabilities
,
sortings
2300
x680
593E
Strange Calculation and Cats
dp
,
matrices
2400
x453
592D
Super M
dfs and similar
,
dp
,
graphs
,
trees
2200
x2415
590D
Top Secret Task
dp
2300
x1150
585F
Digits of Number Pi
dp
,
implementation
,
strings
3200
x640
582E
Boolean Function
bitmasks
,
dp
,
expression parsing
3000
x481
582D
Number of Binominal Coefficients
dp
,
math
,
number theory
3300
x613
581F
Zublicanes and Mumocrates
dp
,
trees
,
two pointers
2400
x855
581E
Kojiro and Furrari
dp
,
greedy
2800
x188
578D
LCS Again
dp
,
greedy
2700
x791
576D
Flights for Regular Customers
dp
,
matrices
2700
x1316
573D
Bear and Cavalry
data structures
,
divide and conquer
,
dp
3000
x455
570E
Pig and Palindromes
combinatorics
,
dp
2300
x1814
568E
Longest Increasing Subsequence
data structures
,
dp
3000
x580
567F
Mausoleum
dp
2400
x568
559E
Gerald and Path
dp
,
sortings
3000
x861
559C
Gerald and Giant Chess
combinatorics
,
dp
,
math
,
number theory
2200
x6232
557E
Ann and Half-Palindrome
data structures
,
dp
,
graphs
,
string suffix structures
,
strings
,
trees
2300
x1068
553E
Kyoya and Train
dp
,
fft
,
graphs
,
math
,
probabilities
3200
x539
547C
Mike and Foam
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2300
x2735
543D
Road Improvement
dp
,
trees
2300
x2571
543C
Remembering Strings
bitmasks
,
dp
2500
x1368
542D
Superhero's Job
dfs and similar
,
dp
,
hashing
,
math
,
number theory
2600
x500
538E
Demiurges Play Again
dfs and similar
,
dp
,
math
,
trees
2200
x1509
536D
Tavas in Kansas
dp
,
games
2900
x712
534F
Simplified Nonogram
bitmasks
,
dp
,
hashing
,
meet-in-the-middle
2400
x445
533D
Landmarks
data structures
,
dp
3000
x218
526E
Transmitting Levels
dp
,
implementation
2400
x1062
520E
Pluses everywhere
combinatorics
,
dp
,
math
,
number theory
2200
x1816
518F
Pasha and Pipe
binary search
,
brute force
,
combinatorics
,
dp
,
implementation
2300
x358
516D
Drazil and Morning Exercise
dfs and similar
,
dp
,
dsu
,
trees
,
two pointers
2800
x1234
514E
Darth Vader and Tree
dp
,
matrices
2200
x1390
513G3
Inversions problem
dp
3100
x254
513G2
Inversions problem
dp
,
probabilities
2400
x632
513E2
Subarray Cuts
dp
2700
x553
513E1
Subarray Cuts
dp
2600
x471
512D
Fox And Travelling
dp
,
trees
2900
x937
509F
Progress Monitoring
dp
,
trees
2300
x869
508E
Arthur and Brackets
dp
,
greedy
2200
x1578
507D
The Maths Lecture
dp
,
implementation
2200
x1706
506E
Mr. Kitayuta's Gift
combinatorics
,
dp
,
matrices
,
strings
3000
x701
500F
New Year Shopping
divide and conquer
,
dp
2700
x703
500E
New Year Domino
data structures
,
dp
,
dsu
2300
x1405
498E
Stairs and Lines
dp
,
matrices
2700
x451
498D
Traffic Jams in the Land
data structures
,
dp
,
number theory
2400
x1081
498B
Name That Tune
dp
,
probabilities
,
two pointers
2400
x1151
497E
Subsequences Return
dp
,
matrices
2900
x284
494D
Birthday
data structures
,
dfs and similar
,
dp
,
trees
2700
x518
494C
Helping People
dp
,
probabilities
2600
x841
490F
Treeland Tour
data structures
,
dfs and similar
,
dp
,
trees
2200
x1579
489E
Hiking
binary search
,
dp
2300
x1003
486E
LIS of Sequence
data structures
,
dp
,
greedy
,
hashing
,
math
2200
x2161
484D
Kindergarten
data structures
,
dp
,
greedy
2400
x2466
482D
Random Function and Tree
combinatorics
,
dp
,
trees
2700
x524
482C
Game with Strings
bitmasks
,
dp
,
probabilities
2600
x884
480D
Parcels
dp
,
graphs
2600
x456
477D
Dreamoon and Binary
dp
,
strings
2700
x520
476E
Dreamoon and Strings
dp
,
strings
2200
x1769
468E
Permanent
dp
,
graph matchings
,
math
,
meet-in-the-middle
3100
x311
467E
Alex and Complicated Task
data structures
,
dp
,
greedy
2300
x769
467D
Fedor and Essay
dfs and similar
,
dp
,
graphs
,
hashing
,
strings
2400
x1778
464D
World of Darkraft - 2
dp
,
probabilities
2700
x662
457F
An easy problem about trees
dp
,
games
,
greedy
,
trees
3200
x105
453D
Little Pony and Elements of Harmony
dp
,
matrices
3000
x461
449E
Jzzhu and Squares
dp
,
math
,
number theory
2900
x285
449D
Jzzhu and Numbers
bitmasks
,
combinatorics
,
dp
2400
x4158
441E
Valera and Number
bitmasks
,
dp
,
math
,
probabilities
2400
x680
440D
Berland Federalization
dp
,
trees
2200
x639
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