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Before contest
Codeforces Round 988 (Div. 3)
28:01:32
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*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
1037D
Valid BFS?
dfs and similar
,
graphs
,
shortest paths
,
trees
1700
x15002
1036G
Sources and Sinks
bitmasks
,
brute force
,
dfs and similar
2700
x381
1036F
Relatively Prime Powers
combinatorics
,
math
,
number theory
2400
x1615
1036E
Covered Points
fft
,
geometry
,
number theory
2400
x1659
1036D
Vasya and Arrays
greedy
,
two pointers
1600
x9331
1036C
Classy Numbers
combinatorics
,
dp
1900
x9789
1036B
Diagonal Walking v.2
math
1600
x5720
1034E
Little C Loves 3 III
bitmasks
,
dp
,
math
3200
x642
1034D
Intervals of Intervals
binary search
,
data structures
,
two pointers
3500
x456
1034C
Region Separation
combinatorics
,
dp
,
number theory
,
trees
2700
x885
1034B
Little C Loves 3 II
brute force
,
constructive algorithms
,
flows
,
graph matchings
2200
x2156
1034A
Enlarge GCD
number theory
1800
x8792
1033G
Chip Game
games
3500
x387
1033F
Boolean Computer
bitmasks
,
brute force
,
fft
,
math
2800
x392
1033E
Hidden Bipartite Graph
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2800
x653
1033D
Divisors
interactive
,
math
,
number theory
2000
x2405
1033C
Permutation Game
brute force
,
dp
,
games
1600
x5608
1032G
Chattering
2900
x466
1032F
Vasya and Maximum Matching
dp
,
trees
2400
x966
1032E
The Unbearable Lightness of Weights
dp
,
math
2100
x1692
1032D
Barcelonian Distance
geometry
,
implementation
1900
x2841
1032C
Playing Piano
constructive algorithms
,
dp
1700
x3984
1031F
Familiar Operations
brute force
,
graphs
,
math
2800
x280
1031E
Triple Flips
constructive algorithms
2600
x533
1031D
Minimum path
greedy
1900
x2815
1031C
Cram Time
greedy
1600
x5328
1031B
Curiosity Has No Limits
1500
x3925
1030G
Linear Congruential Generator
number theory
2900
x361
1030F
Putting Boxes Together
data structures
2500
x813
1030E
Vasya and Good Sequences
bitmasks
,
dp
2000
x3107
1030D
Vasya and Triangle
geometry
,
number theory
1800
x5972
1029F
Multicolored Markers
binary search
,
brute force
,
math
,
number theory
2000
x2581
1029E
Tree with Small Distances
dp
,
graphs
,
greedy
2100
x2943
1029D
Concatenated Multiples
implementation
,
math
1900
x3891
1029C
Maximal Intersection
greedy
,
math
,
sortings
1600
x7589
1028H
Make Square
math
2900
x496
1028G
Guess the number
dp
,
interactive
3000
x574
1028F
Make Symmetrical
brute force
2900
x525
1028E
Restore Array
constructive algorithms
2400
x1146
1028D
Order book
combinatorics
,
data structures
,
greedy
2100
x1746
1028C
Rectangles
geometry
,
implementation
,
sortings
1600
x4612
1027G
X-mouse in the Campus
bitmasks
,
math
,
number theory
2600
x310
1027F
Session in BSU
binary search
,
dfs and similar
,
dsu
,
graph matchings
,
graphs
2400
x1561
1027E
Inverse Coloring
combinatorics
,
dp
,
math
2100
x2137
1027D
Mouse Hunt
dfs and similar
,
graphs
1700
x7520
1027C
Minimum Value Rectangle
greedy
1600
x6913
1025G
Company Acquisitions
constructive algorithms
,
math
3200
x733
1025F
Disjoint Triangles
geometry
2700
x695
1025E
Colored Cubes
constructive algorithms
,
implementation
,
matrices
2700
x571
1025D
Recovering BST
brute force
,
dp
,
math
,
number theory
,
trees
2100
x3668
1025C
Plasticine zebra
constructive algorithms
,
implementation
1600
x6144
1025B
Weakened Common Divisor
brute force
,
greedy
,
number theory
1600
x7919
1023G
Pisces
data structures
,
flows
,
trees
3400
x129
1023F
Mobile Phone Network
dfs and similar
,
dsu
,
graphs
,
trees
2600
x887
1023E
Down or Right
constructive algorithms
,
interactive
,
matrices
2100
x2035
1023D
Array Restoration
constructive algorithms
,
data structures
1700
x4045
1019E
Raining season
data structures
,
divide and conquer
,
trees
3200
x340
1019D
Large Triangle
binary search
,
geometry
,
sortings
2700
x646
1019C
Sergey's problem
constructive algorithms
,
graphs
3000
x1124
1019B
The hat
binary search
,
interactive
2000
x1960
1019A
Elections
brute force
,
greedy
1700
x4650
1017H
The Films
brute force
3300
x147
1017G
The Tree
data structures
3200
x910
1017F
The Neutral Zone
brute force
,
math
2500
x819
1017E
The Supersonic Rocket
geometry
,
hashing
,
strings
2400
x1027
1017D
The Wu
bitmasks
,
brute force
,
data structures
1900
x3540
1017C
The Phone Number
constructive algorithms
,
greedy
1600
x6025
1016G
Appropriate Team
bitmasks
,
math
,
number theory
2700
x266
1016F
Road Projects
dfs and similar
,
dp
,
trees
2600
x818
1016E
Rest In The Shades
binary search
,
geometry
2400
x1160
1016D
Vasya And The Matrix
constructive algorithms
,
flows
,
math
1800
x4719
1016C
Vasya And The Mushrooms
dp
,
implementation
1800
x3769
1015F
Bracket Substring
dp
,
strings
2300
x1137
1015E2
Stars Drawing (Hard Edition)
binary search
,
dp
,
greedy
1900
x3628
1015E1
Stars Drawing (Easy Edition)
brute force
,
dp
,
greedy
1700
x5874
1015D
Walking Between Houses
constructive algorithms
,
greedy
1600
x8247
1012F
Passports
dp
,
implementation
3400
x158
1012E
Cycle sort
dsu
,
math
3100
x330
1012D
AB-Strings
constructive algorithms
,
strings
2800
x371
1012C
Hills
dp
1900
x3511
1012B
Chemical table
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
matrices
1900
x4030
1012A
Photo of The Sky
brute force
,
implementation
,
math
,
sortings
1500
x6434
1010F
Tree
fft
,
graphs
,
trees
3400
x218
1010E
Store
data structures
2700
x336
1010D
Mars rover
dfs and similar
,
graphs
,
implementation
,
trees
2000
x2388
1010C
Border
number theory
1800
x4872
1010B
Rocket
binary search
,
interactive
1800
x5197
1010A
Fly
binary search
,
math
1500
x8091
1009G
Allowed Letters
bitmasks
,
flows
,
graph matchings
,
graphs
,
greedy
2400
x835
1009F
Dominant Indices
data structures
,
dsu
,
trees
2300
x5808
1009E
Intercity Travelling
combinatorics
,
math
,
probabilities
2000
x3008
1009D
Relatively Prime Graph
brute force
,
constructive algorithms
,
graphs
,
greedy
,
math
1700
x6265
1009C
Annoying Present
greedy
,
math
1700
x5309
1009B
Minimum Ternary String
greedy
,
implementation
1400
x10160
1007E
Mini Metro
dp
3400
x219
1007D
Ants
2-sat
,
data structures
,
trees
3200
x288
1007C
Guess two numbers
binary search
,
interactive
3000
x419
1007B
Pave the Parallelepiped
bitmasks
,
brute force
,
combinatorics
,
math
,
number theory
2400
x954
1006F
Xor-Paths
bitmasks
,
brute force
,
dp
,
meet-in-the-middle
2100
x5425
1006E
Military Problem
dfs and similar
,
graphs
,
trees
1600
x9968
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