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Codeforces Round (Div. 2)
4 days
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Difficulty:
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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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Custom test
Problems
#
Name
645E
Intellectual Inquiry
dp
,
greedy
,
strings
2200
x1228
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
x1092
633F
The Chocolate Spree
dfs and similar
,
dp
,
graphs
,
trees
2600
x914
633D
Fibonacci-ish
brute force
,
dp
,
hashing
,
implementation
,
math
2000
x2625
632E
Thief in a Shop
divide and conquer
,
dp
,
fft
,
math
2400
x2634
631E
Product Sum
data structures
,
dp
,
geometry
2600
x2265
629E
Famil Door and Roads
combinatorics
,
data structures
,
dfs and similar
,
dp
,
probabilities
,
trees
2300
x975
629D
Babaei and Birthday Cake
data structures
,
dp
2000
x3921
629C
Famil Door and Brackets
dp
,
strings
2000
x2752
628D
Magic Numbers
dp
2200
x5578
627D
Preorder Test
binary search
,
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2600
x808
626G
Raffles
data structures
,
dp
,
greedy
,
math
3100
x522
626F
Group Projects
dp
2400
x2724
623E
Transforming Sequence
combinatorics
,
dp
,
fft
,
math
3300
x540
623C
Electric Charges
binary search
,
dp
2900
x450
623B
Array GCD
dp
,
greedy
,
number theory
2300
x2055
621E
Wet Shark and Blocks
dp
,
matrices
2000
x2756
618G
Combining Slimes
dp
,
math
,
matrices
,
probabilities
3300
x232
618D
Hamiltonian Spanning Tree
dfs and similar
,
dp
,
graph matchings
,
greedy
,
trees
2200
x1700
615C
Running Track
dp
,
greedy
,
strings
,
trees
2000
x2261
613E
Puzzle Lover
dp
,
hashing
,
strings
3200
x457
613D
Kingdom and its Cities
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
sortings
,
trees
2800
x2741
612F
Simba on the Circle
dp
2600
x375
611D
New Year and Ancient Prophecy
dp
,
hashing
,
strings
2000
x2532
601E
A Museum Robbery
data structures
,
dp
2800
x821
601C
Kleofáš and the n-thlon
dp
,
math
,
probabilities
2300
x1292
599E
Sandy and Nuts
bitmasks
,
dp
,
trees
2600
x626
598E
Chocolate Bar
brute force
,
dp
2000
x4720
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
x584
592D
Super M
dfs and similar
,
dp
,
graphs
,
trees
2200
x2550
590D
Top Secret Task
dp
2300
x1151
587B
Duff in Beach
dp
2100
x1380
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
x856
581E
Kojiro and Furrari
dp
,
greedy
2800
x189
578D
LCS Again
dp
,
greedy
2700
x792
576D
Flights for Regular Customers
dp
,
matrices
2700
x1323
575F
Bulbo
dp
,
greedy
2100
x990
573D
Bear and Cavalry
data structures
,
divide and conquer
,
dp
3000
x457
571B
Minimization
dp
,
greedy
,
sortings
2000
x2544
570E
Pig and Palindromes
combinatorics
,
dp
2300
x1816
568E
Longest Increasing Subsequence
data structures
,
dp
3000
x580
567F
Mausoleum
dp
2400
x570
559E
Gerald and Path
dp
,
sortings
3000
x863
559C
Gerald and Giant Chess
combinatorics
,
dp
,
math
,
number theory
2200
x6250
557E
Ann and Half-Palindrome
data structures
,
dp
,
graphs
,
string suffix structures
,
strings
,
trees
2300
x1070
553E
Kyoya and Train
dp
,
fft
,
graphs
,
math
,
probabilities
3200
x542
552E
Vanya and Brackets
brute force
,
dp
,
expression parsing
,
greedy
,
implementation
,
strings
2100
x1467
547C
Mike and Foam
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2300
x2748
543D
Road Improvement
dp
,
trees
2300
x2576
543C
Remembering Strings
bitmasks
,
dp
2500
x1369
542F
Quest
dp
,
greedy
2100
x916
542D
Superhero's Job
dfs and similar
,
dp
,
hashing
,
math
,
number theory
2600
x501
538E
Demiurges Play Again
dfs and similar
,
dp
,
math
,
trees
2200
x1511
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
x219
533B
Work Group
dfs and similar
,
dp
,
graphs
,
strings
,
trees
2000
x2330
526E
Transmitting Levels
dp
,
implementation
2400
x1063
525E
Anya and Cubes
binary search
,
bitmasks
,
brute force
,
dp
,
math
,
meet-in-the-middle
2100
x2888
520E
Pluses everywhere
combinatorics
,
dp
,
math
,
number theory
2200
x1819
519E
A and B and Lecture Rooms
binary search
,
data structures
,
dfs and similar
,
dp
,
trees
2100
x6407
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
x1391
513G3
Inversions problem
dp
3100
x258
513G2
Inversions problem
dp
,
probabilities
2400
x638
513E2
Subarray Cuts
dp
2700
x554
513E1
Subarray Cuts
dp
2600
x471
512D
Fox And Travelling
dp
,
trees
2900
x939
509F
Progress Monitoring
dp
,
trees
2300
x902
509C
Sums of Digits
dp
,
greedy
,
implementation
2000
x2032
508E
Arthur and Brackets
dp
,
greedy
2200
x1578
507E
Breaking Good
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2784
507D
The Maths Lecture
dp
,
implementation
2200
x1708
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
x452
498D
Traffic Jams in the Land
data structures
,
dp
,
number theory
2400
x1082
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
x519
494C
Helping People
dp
,
probabilities
2600
x843
494B
Obsessive String
dp
,
strings
2000
x2618
490F
Treeland Tour
data structures
,
dfs and similar
,
dp
,
trees
2200
x1580
489F
Special Matrices
combinatorics
,
dp
2100
x1608
489E
Hiking
binary search
,
dp
2300
x1005
487B
Strip
binary search
,
data structures
,
dp
,
two pointers
2000
x3395
486E
LIS of Sequence
data structures
,
dp
,
greedy
,
hashing
,
math
2200
x2166
486D
Valid Sets
dfs and similar
,
dp
,
math
,
trees
2100
x3873
484D
Kindergarten
data structures
,
dp
,
greedy
2400
x2472
482D
Random Function and Tree
combinatorics
,
dp
,
trees
2700
x524
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