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Codeforces Round 968 (Div. 2)
09:41:59
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constructive algorithms
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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
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number theory
probabilities
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shortest paths
sortings
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strings
ternary search
trees
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Problems
#
Name
1031E
Triple Flips
constructive algorithms
2600
x528
1028E
Restore Array
constructive algorithms
2400
x1135
1028B
Unnatural Conditions
constructive algorithms
,
math
1200
x8988
1025G
Company Acquisitions
constructive algorithms
,
math
3200
x715
1025E
Colored Cubes
constructive algorithms
,
implementation
,
matrices
2700
x563
1025C
Plasticine zebra
constructive algorithms
,
implementation
1600
x6094
1023E
Down or Right
constructive algorithms
,
interactive
,
matrices
2100
x2010
1023D
Array Restoration
constructive algorithms
,
data structures
1700
x4016
1019C
Sergey's problem
constructive algorithms
,
graphs
3000
x1102
1017C
The Phone Number
constructive algorithms
,
greedy
1600
x5976
1016D
Vasya And The Matrix
constructive algorithms
,
flows
,
math
1800
x4663
1015D
Walking Between Houses
constructive algorithms
,
greedy
1600
x8128
1012D
AB-Strings
constructive algorithms
,
strings
2800
x321
1012B
Chemical table
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
matrices
1900
x3924
1009D
Relatively Prime Graph
brute force
,
constructive algorithms
,
graphs
,
greedy
,
math
1700
x6215
1004D
Sonya and Matrix
brute force
,
constructive algorithms
,
implementation
2300
x1399
1004C
Sonya and Robots
constructive algorithms
,
implementation
1400
x7497
1004B
Sonya and Exhibition
constructive algorithms
,
greedy
,
implementation
,
math
1300
x9456
1003E
Tree Constructing
constructive algorithms
,
graphs
2100
x2687
1003B
Binary String Constructing
constructive algorithms
1300
x11247
998A
Balloons
constructive algorithms
,
implementation
1000
x9434
995A
Tesla
constructive algorithms
,
implementation
2100
x1687
990D
Graph And Its Complement
constructive algorithms
,
graphs
,
implementation
1700
x3782
989C
A Mist of Florescence
constructive algorithms
,
graphs
1800
x3776
989B
A Tide of Riverscape
constructive algorithms
,
strings
1200
x7027
985D
Sand Fortress
binary search
,
constructive algorithms
,
math
2100
x2533
982A
Row
brute force
,
constructive algorithms
1200
x9038
980B
Marlin
constructive algorithms
1600
x4667
976D
Degree Set
constructive algorithms
,
graphs
,
implementation
2500
x675
963B
Destruction of a Tree
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x2777
962E
Byteland, Berland and Disputed Cities
constructive algorithms
,
greedy
2200
x1057
962B
Students in Railway Carriage
constructive algorithms
,
greedy
,
implementation
1300
x7645
960C
Subsequence Counting
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1700
x3912
959D
Mahmoud and Ehab and another array construction task
constructive algorithms
,
greedy
,
math
,
number theory
1900
x3080
959C
Mahmoud and Ehab and the wrong algorithm
constructive algorithms
,
trees
1500
x5744
952G
Puzzling Language
constructive algorithms
2200
x233
949B
A Leapfrog in the Array
constructive algorithms
,
math
1700
x3711
940C
Phone Numbers
constructive algorithms
,
implementation
,
strings
1500
x5761
938C
Constructing Tests
binary search
,
brute force
,
constructive algorithms
1700
x3303
936C
Lock Puzzle
constructive algorithms
,
implementation
,
strings
2300
x1166
934B
A Prosperous Lot
constructive algorithms
,
implementation
1200
x8638
933E
A Preponderant Reunion
constructive algorithms
,
dp
3200
x187
932C
Permutation Cycle
brute force
,
constructive algorithms
1600
x4003
932A
Palindromic Supersequence
constructive algorithms
800
x10265
931B
World Cup
constructive algorithms
,
implementation
1200
x7086
926E
Merge Equal Elements
constructive algorithms
,
data structures
1900
x923
925D
Aztec Catacombs
constructive algorithms
2600
x485
925C
Big Secret
constructive algorithms
,
math
2200
x1292
923F
Public Service
constructive algorithms
,
graphs
,
trees
3200
x74
923D
Picking Strings
constructive algorithms
,
implementation
,
strings
2500
x1183
922F
Divisibility
constructive algorithms
,
dp
,
greedy
,
number theory
2400
x635
916C
Jamie and Interesting Graph
constructive algorithms
,
graphs
,
shortest paths
1600
x5069
912B
New Year's Eve
bitmasks
,
constructive algorithms
,
number theory
1300
x11905
911F
Tree Destruction
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2400
x1661
911E
Stack Sorting
constructive algorithms
,
data structures
,
greedy
,
implementation
2000
x2508
911C
Three Garlands
brute force
,
constructive algorithms
1400
x7006
910C
Minimum Sum
constructive algorithms
,
greedy
,
math
1700
x1787
909F
AND-permutations
constructive algorithms
2500
x571
909B
Segments
constructive algorithms
,
math
1300
x6328
906B
Seating of Students
brute force
,
constructive algorithms
,
math
2200
x1134
901D
Weighting a Tree
constructive algorithms
,
dfs and similar
,
graphs
2700
x451
901B
GCD of Polynomials
constructive algorithms
,
math
2200
x1577
901A
Hashing Trees
constructive algorithms
,
trees
1500
x5081
899D
Shovel Sale
constructive algorithms
,
math
1800
x2736
899C
Dividing the numbers
constructive algorithms
,
graphs
,
math
1300
x8414
899A
Splitting in Teams
constructive algorithms
,
greedy
,
math
800
x10160
898E
Squares and not squares
constructive algorithms
,
greedy
1600
x4555
896B
Ithea Plays With Chtholly
binary search
,
constructive algorithms
,
games
,
greedy
,
interactive
2000
x2095
894C
Marco and GCD Sequence
constructive algorithms
,
math
1900
x4347
894B
Ralph And His Magic Field
combinatorics
,
constructive algorithms
,
math
,
number theory
1800
x4449
891B
Gluttony
constructive algorithms
,
greedy
2000
x2974
888G
Xor-MST
bitmasks
,
constructive algorithms
,
data structures
2300
x4384
886D
Restoration of string
constructive algorithms
,
graphs
,
implementation
2000
x1765
883K
Road Widening
constructive algorithms
,
greedy
,
implementation
1800
x1085
883J
Renovation
constructive algorithms
,
greedy
,
sortings
2400
x575
883B
Berland Army
constructive algorithms
,
graphs
,
greedy
2600
x342
878A
Short Program
bitmasks
,
constructive algorithms
1600
x5413
877C
Slava and tanks
constructive algorithms
1600
x5656
873D
Merge Sort
constructive algorithms
,
divide and conquer
1800
x3070
868C
Qualification Rounds
bitmasks
,
brute force
,
constructive algorithms
,
dp
1500
x4593
865D
Buy Low Sell High
constructive algorithms
,
data structures
,
greedy
2400
x5352
865A
Save the problem!
constructive algorithms
1400
x4317
862C
Mahmoud and Ehab and the xor
constructive algorithms
1900
x4034
858F
Wizard's Tour
constructive algorithms
,
dfs and similar
,
graphs
2300
x1542
856A
Set Theory
brute force
,
constructive algorithms
1600
x1417
854B
Maxim Buys an Apartment
constructive algorithms
,
math
1200
x8172
854A
Fraction
brute force
,
constructive algorithms
,
math
800
x13554
850D
Tournament Construction
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
2800
x379
848B
Rooter's Song
constructive algorithms
,
data structures
,
geometry
,
implementation
,
sortings
,
two pointers
1900
x1882
848A
From Y to Y
constructive algorithms
1600
x5110
847L
Berland SU Computer Network
constructive algorithms
,
dfs and similar
,
graphs
,
hashing
,
trees
2400
x320
847D
Dog Show
constructive algorithms
,
data structures
,
greedy
2200
x1202
847C
Sum of Nestings
constructive algorithms
1800
x2352
843C
Upgrading Tree
constructive algorithms
,
dfs and similar
,
graphs
,
math
,
trees
2600
x352
840B
Leha and another game about graph
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
graphs
2100
x2455
835E
The penguin's game
binary search
,
constructive algorithms
,
interactive
2400
x1143
831C
Jury Marks
brute force
,
constructive algorithms
1700
x4497
830E
Perpetual Motion Machine
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
,
trees
3100
x277
827B
High Load
constructive algorithms
,
greedy
,
implementation
,
trees
1800
x3499
822F
Madness
constructive algorithms
,
dfs and similar
,
trees
2500
x344
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