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Codeforces Round 974 (Div. 3)
00:50:05
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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
832E
Vasya and Shifts
matrices
2600
x324
832D
Misha, Grisha and Underground
dfs and similar
,
graphs
,
trees
1900
x3757
832C
Strange Radiation
binary search
,
implementation
,
math
2500
x447
832B
Petya and Exam
implementation
,
strings
1600
x4372
831C
Jury Marks
brute force
,
constructive algorithms
1700
x4524
830E
Perpetual Motion Machine
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
,
trees
3100
x277
830D
Singer House
combinatorics
,
dp
,
graphs
,
trees
2800
x827
830C
Bamboo Partition
brute force
,
data structures
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2300
x1196
830B
Cards Sorting
data structures
,
implementation
,
sortings
1600
x2834
830A
Office Keys
binary search
,
brute force
,
dp
,
greedy
,
sortings
1800
x6969
827F
Dirty Arkady's Kitchen
data structures
,
dp
,
graphs
,
shortest paths
3200
x400
827E
Rusty String
fft
,
math
,
strings
2700
x960
827D
Best Edge Weight
data structures
,
dfs and similar
,
graphs
,
trees
2700
x1159
827C
DNA Evolution
data structures
,
strings
2100
x1637
827B
High Load
constructive algorithms
,
greedy
,
implementation
,
trees
1800
x3504
827A
String Reconstruction
data structures
,
greedy
,
sortings
,
strings
1700
x4036
825G
Tree Queries
dfs and similar
,
graphs
,
trees
2500
x1200
825F
String Compression
dp
,
hashing
,
string suffix structures
,
strings
2400
x1494
825E
Minimal Labels
data structures
,
dfs and similar
,
graphs
,
greedy
2300
x3381
825C
Multi-judge Solving
greedy
,
implementation
1600
x4530
825B
Five-In-a-Row
brute force
,
implementation
1600
x4245
822F
Madness
constructive algorithms
,
dfs and similar
,
trees
2500
x345
822E
Liar
binary search
,
dp
,
hashing
,
string suffix structures
2400
x837
822D
My pretty girl Noora
brute force
,
dp
,
greedy
,
math
,
number theory
1800
x3084
822C
Hacker, pack your bags!
binary search
,
greedy
,
implementation
,
sortings
1600
x4577
821E
Okabe and El Psy Kongroo
dp
,
matrices
2100
x1459
821D
Okabe and City
dfs and similar
,
graphs
,
shortest paths
2200
x1395
819E
Mister B and Flight to the Moon
constructive algorithms
,
graphs
2800
x510
819D
Mister B and Astronomers
number theory
2900
x262
819C
Mister B and Beacons on Field
number theory
2900
x210
819B
Mister B and PR Shifts
data structures
,
implementation
,
math
1900
x1696
819A
Mister B and Boring Game
games
,
greedy
2200
x490
818G
Four Melodies
flows
,
graphs
2600
x736
818F
Level Generation
binary search
,
math
,
ternary search
2100
x1552
818E
Card Game Again
binary search
,
data structures
,
number theory
,
two pointers
1900
x2261
818D
Multicolored Cars
data structures
,
implementation
1700
x3462
818C
Sofa Thief
brute force
,
implementation
2000
x1241
818B
Permutation Game
implementation
1600
x3010
817F
MEX Queries
binary search
,
data structures
,
trees
2300
x2561
817E
Choosing The Commander
bitmasks
,
data structures
,
trees
2000
x2884
817D
Imbalanced Array
data structures
,
divide and conquer
,
dsu
,
sortings
1900
x4674
817C
Really Big Numbers
binary search
,
brute force
,
dp
,
math
1600
x7335
815E
Karen and Neighborhood
binary search
,
constructive algorithms
,
implementation
2900
x222
815D
Karen and Cards
binary search
,
combinatorics
,
data structures
,
geometry
2800
x612
815C
Karen and Supermarket
brute force
,
dp
,
trees
2400
x2626
815B
Karen and Test
brute force
,
combinatorics
,
constructive algorithms
,
math
2200
x1377
815A
Karen and Game
brute force
,
greedy
,
implementation
1700
x5615
814E
An unavoidable detour for home
combinatorics
,
dp
,
graphs
,
shortest paths
2600
x651
814D
An overnight dance in discotheque
dfs and similar
,
dp
,
geometry
,
greedy
,
trees
2000
x2332
814C
An impassioned circulation of affection
brute force
,
dp
,
strings
,
two pointers
1600
x6552
813F
Bipartite Checking
data structures
,
dsu
,
graphs
2500
x1341
813E
Army Creation
binary search
,
data structures
2200
x2397
813D
Two Melodies
dp
,
flows
2600
x1022
813C
The Tag Game
dfs and similar
,
graphs
1700
x5934
813B
The Golden Age
brute force
,
math
1800
x3908
812E
Sagheer and Apple Tree
games
,
trees
2300
x1095
812D
Sagheer and Kindergarten
dfs and similar
,
graphs
,
implementation
,
trees
2700
x329
812B
Sagheer, the Hausmeister
bitmasks
,
brute force
,
dp
1600
x5158
811E
Vladik and Entertaining Flags
data structures
,
dsu
,
graphs
2600
x869
811D
Vladik and Favorite Game
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2100
x1762
811C
Vladik and Memorable Trip
dp
,
implementation
1900
x3245
809E
Surprise me!
divide and conquer
,
math
,
number theory
,
trees
3100
x733
809D
Hitchhiking in the Baltic States
data structures
,
dp
2900
x834
809C
Find a car
combinatorics
,
divide and conquer
,
dp
2600
x738
809B
Glad to see you!
binary search
,
interactive
2200
x1658
808G
Anthem of Berland
dp
,
strings
2300
x2675
808F
Card Game
binary search
,
flows
,
graphs
2400
x1165
808E
Selling Souvenirs
binary search
,
dp
,
greedy
,
ternary search
2300
x1829
808D
Array Division
binary search
,
data structures
,
implementation
1900
x6975
804F
Fake bullions
combinatorics
,
dfs and similar
,
dp
,
graphs
,
number theory
3400
x163
804E
The same permutation
constructive algorithms
3100
x426
804D
Expected diameter of a tree
binary search
,
brute force
,
dfs and similar
,
dp
,
sortings
,
trees
2500
x1299
804C
Ice cream coloring
constructive algorithms
,
dfs and similar
,
greedy
2200
x1844
803G
Periodic RMQ Problem
data structures
2300
x1555
803F
Coprime Subsequences
bitmasks
,
combinatorics
,
number theory
2000
x3207
803E
Roma and Poker
dp
,
graphs
2000
x2173
803D
Magazine Ad
binary search
,
greedy
1900
x3244
803C
Maximal GCD
constructive algorithms
,
greedy
,
math
1900
x5089
802O
April Fools' Problem (hard)
binary search
,
data structures
,
flows
2900
x937
802N
April Fools' Problem (medium)
binary search
,
flows
,
graphs
2400
x1188
802L
Send the Fool Further! (hard)
dfs and similar
,
dp
,
math
,
trees
2400
x302
802K
Send the Fool Further! (medium)
dp
,
trees
2100
x635
802I
Fake News (hard)
string suffix structures
2300
x1526
802H
Fake News (medium)
constructive algorithms
,
strings
2200
x444
802F
Marmots (hard)
math
,
probabilities
2800
x124
802E
Marmots (medium)
math
2200
x249
802D
Marmots (easy)
math
2100
x452
802C
Heidi and Library (hard)
flows
2600
x556
802B
Heidi and Library (medium)
data structures
,
greedy
1800
x1113
802A
Heidi and Library (easy)
greedy
1800
x1365
799G
Cut the pie
binary search
,
data structures
,
geometry
3500
x116
799F
Beautiful fountains rows
data structures
3500
x443
799E
Aquarium decoration
data structures
,
greedy
,
two pointers
2500
x930
799D
Field expansion
brute force
,
dp
,
meet-in-the-middle
2100
x2028
799C
Fountains
binary search
,
data structures
,
implementation
1800
x3755
798E
Mike and code of a permutation
constructive algorithms
,
data structures
,
graphs
,
sortings
3000
x480
798D
Mike and distribution
constructive algorithms
,
sortings
2400
x1902
798C
Mike and gcd problem
dp
,
greedy
,
number theory
1700
x5786
797F
Mice and Holes
data structures
,
dp
,
greedy
,
sortings
2600
x1192
797E
Array Queries
brute force
,
data structures
,
dp
2000
x4380
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