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Codeforces Round 974 (Div. 3)
02:53:11
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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
754B
Ilya and tic-tac-toe game
brute force
,
implementation
1100
x7215
754A
Lesha and array splitting
constructive algorithms
,
greedy
,
implementation
1200
x8668
753C
Interactive Bulls and Cows (Hard)
brute force
,
constructive algorithms
,
interactive
2500
x291
753B
Interactive Bulls and Cows (Easy)
brute force
,
constructive algorithms
,
implementation
1600
x1190
753A
Santa Claus and Candies
dp
,
greedy
,
math
1000
x9014
750H
New Year and Snowy Grid
dfs and similar
,
dsu
,
graphs
,
interactive
3500
x192
750G
New Year and Binary Tree Paths
bitmasks
,
brute force
,
combinatorics
,
dp
3200
x447
750F
New Year and Finding Roots
constructive algorithms
,
implementation
,
interactive
,
trees
2800
x482
750E
New Year and Old Subsequence
data structures
,
divide and conquer
,
dp
,
matrices
2600
x1561
750D
New Year and Fireworks
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
1900
x3077
750C
New Year and Rating
binary search
,
greedy
,
math
1600
x6547
750B
New Year and North Pole
geometry
,
implementation
1300
x9465
750A
New Year and Hurry
binary search
,
brute force
,
implementation
,
math
800
x74795
749E
Inversions After Shuffle
data structures
,
probabilities
2400
x1051
749D
Leaving Auction
binary search
,
data structures
2000
x2556
749C
Voting
greedy
,
implementation
,
two pointers
1500
x5965
749B
Parallelogram is Back
brute force
,
constructive algorithms
,
geometry
1200
x8480
749A
Bachgold Problem
greedy
,
implementation
,
math
,
number theory
800
x48894
748F
Santa Clauses and a Soccer Championship
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2300
x646
748E
Santa Claus and Tangerines
binary search
,
data structures
,
greedy
,
two pointers
2100
x1465
748D
Santa Claus and a Palindrome
constructive algorithms
,
data structures
,
greedy
2100
x1857
748C
Santa Claus and Robot
constructive algorithms
,
math
1400
x4604
748B
Santa Claus and Keyboard Check
implementation
,
strings
1500
x5337
748A
Santa Claus and a Place in a Class
implementation
,
math
800
x8954
747F
Igor and Interesting Numbers
brute force
,
combinatorics
,
dp
,
math
2500
x418
747E
Comments
dfs and similar
,
expression parsing
,
implementation
,
strings
1700
x1959
747D
Winter Is Coming
dp
,
greedy
,
sortings
1800
x3242
747C
Servers
implementation
1300
x4628
747B
Mammoth's Genome Decoding
implementation
,
strings
900
x8835
747A
Display Size
brute force
,
math
800
x10213
746G
New Roads
constructive algorithms
,
graphs
,
trees
2100
x1509
746F
Music in Car
data structures
,
greedy
,
two pointers
2200
x742
746E
Numbers Exchange
greedy
,
implementation
,
math
1900
x1734
746D
Green and Black Tea
constructive algorithms
,
greedy
,
math
1500
x5089
746C
Tram
constructive algorithms
,
implementation
,
math
1600
x3708
746B
Decoding
implementation
,
strings
900
x27707
746A
Compote
implementation
,
math
800
x21305
745B
Hongcow Solves A Puzzle
implementation
1400
x3736
745A
Hongcow Learns the Cyclic Shift
implementation
,
strings
900
x10434
744E
Hongcow Masters the Cyclic Shift
strings
,
two pointers
3200
x135
744D
Hongcow Draws a Circle
geometry
3200
x119
744C
Hongcow Buys a Deck of Cards
bitmasks
,
brute force
,
dp
2400
x1086
744B
Hongcow's Game
bitmasks
,
divide and conquer
,
interactive
1900
x1750
744A
Hongcow Builds A Nation
dfs and similar
,
graphs
1500
x8289
743E
Vladik and cards
binary search
,
bitmasks
,
brute force
,
dp
2200
x1498
743D
Chloe and pleasant prizes
dfs and similar
,
dp
,
graphs
,
trees
1800
x4302
743C
Vladik and fractions
brute force
,
constructive algorithms
,
math
,
number theory
1500
x12241
743B
Chloe and the sequence
binary search
,
bitmasks
,
constructive algorithms
,
implementation
1200
x14672
743A
Vladik and flights
constructive algorithms
,
greedy
,
implementation
1200
x11028
742B
Arpa’s obvious problem and Mehrdad’s terrible solution
brute force
,
math
,
number theory
1500
x9227
742A
Arpa’s hard exam and Mehrdad’s naive cheat
implementation
,
math
,
number theory
1000
x42142
741E
Arpa’s abnormal DNA and Mehrdad’s deep interest
data structures
,
string suffix structures
3400
x177
741D
Arpa’s letter-marked tree and Mehrdad’s Dokhtar-kosh paths
data structures
,
dfs and similar
,
trees
2900
x2708
741C
Arpa’s overnight party and Mehrdad’s silent entering
constructive algorithms
,
dfs and similar
,
graphs
2600
x2570
741B
Arpa's weak amphitheater and Mehrdad's valuable Hoses
dfs and similar
,
dp
,
dsu
1600
x5217
741A
Arpa's loud Owf and Mehrdad's evil plan
dfs and similar
,
math
1600
x5423
740B
Alyona and flowers
constructive algorithms
1200
x8272
740A
Alyona and copybooks
brute force
,
implementation
1300
x8896
739E
Gosha is hunting
brute force
,
data structures
,
dp
,
flows
,
math
,
probabilities
,
sortings
3000
x2157
739D
Recover a functional graph
graph matchings
3400
x186
739C
Alyona and towers
data structures
2500
x1506
739B
Alyona and a tree
binary search
,
data structures
,
dfs and similar
,
graphs
,
trees
1900
x4578
739A
Alyona and mex
constructive algorithms
,
greedy
1700
x7824
737F
Dirty plates
constructive algorithms
,
math
3300
x70
737E
Tanya is 5!
graph matchings
,
graphs
,
greedy
,
schedules
3300
x121
736E
Chess Championship
constructive algorithms
,
flows
,
greedy
,
math
2900
x187
736D
Permutations
math
,
matrices
2800
x459
735E
Ostap and Tree
dp
,
trees
2500
x864
735D
Taxes
math
,
number theory
1600
x13366
735C
Tennis Championship
combinatorics
,
constructive algorithms
,
greedy
,
math
1600
x7497
735B
Urbanization
greedy
,
number theory
,
sortings
1100
x8375
735A
Ostap and Grasshopper
implementation
,
strings
800
x12444
734F
Anton and School
bitmasks
,
constructive algorithms
,
implementation
,
math
2500
x1292
734E
Anton and Tree
dfs and similar
,
dp
,
trees
2100
x4147
734D
Anton and Chess
implementation
1700
x3722
734C
Anton and Making Potions
binary search
,
dp
,
greedy
,
two pointers
1600
x5322
734B
Anton and Digits
brute force
,
greedy
,
implementation
,
math
800
x29179
734A
Anton and Danik
implementation
,
strings
800
x149906
733F
Drivers Dissatisfaction
data structures
,
dsu
,
graphs
,
trees
2200
x1110
733E
Sleep in Class
constructive algorithms
,
data structures
,
math
,
two pointers
2400
x893
733D
Kostya the Sculptor
data structures
,
hashing
1600
x4166
733C
Epidemic in Monstropolis
constructive algorithms
,
dp
,
greedy
,
two pointers
1800
x3339
733B
Parade
math
1100
x10665
733A
Grasshopper And the String
implementation
1000
x16125
732F
Tourist Reform
dfs and similar
,
graphs
2300
x2514
732E
Sockets
greedy
,
sortings
2100
x1604
732D
Exams
binary search
,
greedy
,
sortings
1700
x5495
732C
Sanatorium
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
1200
x9693
732B
Cormen --- The Best Friend Of a Man
dp
,
greedy
1000
x24457
732A
Buy a Shovel
brute force
,
constructive algorithms
,
implementation
,
math
800
x71629
731F
Video Cards
brute force
,
data structures
,
implementation
,
math
,
number theory
1900
x2823
731E
Funny Game
dp
,
games
2200
x1656
731D
80-th Level Archeology
brute force
,
data structures
,
greedy
,
sortings
2200
x1167
731C
Socks
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x6911
731B
Coupons and Discounts
constructive algorithms
,
greedy
1100
x7952
731A
Night at the Museum
implementation
,
strings
800
x45406
730L
Expression Queries
data structures
3200
x86
730K
Roads Orientation Problem
graphs
3200
x98
730J
Bottles
dp
1900
x3361
730I
Olympiad in Programming and Sports
dp
,
flows
,
graphs
,
greedy
2000
x2031
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