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Codeforces Round 974 (Div. 3)
00:50:14
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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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Problems
#
Name
660B
Seating On Bus
implementation
1000
x5341
660A
Co-prime Array
greedy
,
implementation
,
math
,
number theory
1200
x8817
659G
Fence Divercity
combinatorics
,
dp
,
number theory
2300
x1183
659F
Polycarp and Hay
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2000
x1781
659E
New Reform
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x7444
659D
Bicycle Race
geometry
,
implementation
,
math
1500
x6307
659C
Tanya and Toys
greedy
,
implementation
1200
x11465
659B
Qualifying Contest
constructive algorithms
,
sortings
1300
x6256
659A
Round House
implementation
,
math
1000
x15638
658A
Bear and Reverse Radewoosh
implementation
800
x7057
656G
You're a Professional
*special problem
1900
x483
656F
Ace It!
*special problem
1900
x902
656E
Out of Controls
*special problem
2000
x723
656D
Rosetta Problem
*special problem
2100
x955
656C
Without Text
*special problem
2000
x689
656B
Scrambled
*special problem
,
implementation
1700
x1651
656A
Da Vinci Powers
*special problem
1900
x3608
653G
Move by Prime
combinatorics
,
math
,
number theory
3100
x530
653F
Paper task
data structures
,
string suffix structures
,
strings
2600
x993
653E
Bear and Forgotten Tree 2
dfs and similar
,
dsu
,
graphs
,
trees
2400
x1483
653D
Delivery Bears
binary search
,
flows
,
graphs
2200
x2396
653C
Bear and Up-Down
brute force
,
implementation
1900
x1640
653B
Bear and Compressing
brute force
,
dfs and similar
,
dp
,
strings
1300
x4958
653A
Bear and Three Balls
brute force
,
implementation
,
sortings
900
x8182
652F
Ants on a Circle
constructive algorithms
,
math
2800
x547
652E
Pursuit For Artifacts
dfs and similar
,
dsu
,
graphs
,
trees
2300
x2114
652D
Nested Segments
data structures
,
sortings
1800
x3948
652C
Foe Pairs
combinatorics
,
sortings
,
two pointers
1800
x3201
652B
z-sort
sortings
1000
x10104
652A
Gabriel and Caterpillar
implementation
,
math
1400
x4621
651B
Beautiful Paintings
greedy
,
sortings
1200
x11500
651A
Joysticks
dp
,
greedy
,
implementation
,
math
1100
x22889
650E
Clockwork Bomb
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
3200
x598
650D
Zip-line
binary search
,
data structures
,
dp
,
hashing
2600
x1324
650C
Table Compression
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
2200
x1969
650B
Image Preview
binary search
,
brute force
,
dp
,
two pointers
1900
x3340
650A
Watchmen
data structures
,
geometry
,
math
1400
x15418
649E
Автобус
binary search
,
data structures
,
greedy
,
sortings
2100
x108
649D
Дефрагментация памяти
constructive algorithms
,
greedy
,
implementation
1600
x352
649C
Печать условий
constructive algorithms
,
greedy
,
sortings
1500
x447
649B
Этажи
constructive algorithms
1400
x531
649A
Любимые числа Поликарпа
constructive algorithms
,
implementation
1000
x1200
648E
Собери число
graphs
,
shortest paths
2300
x127
648D
Собачки и миски
data structures
,
greedy
,
sortings
1900
x232
648C
Путь Робота
constructive algorithms
,
dfs and similar
,
graphs
1100
x936
648B
Собери стол
constructive algorithms
,
sortings
800
x1417
648A
Наибольший подъем
constructive algorithms
,
implementation
900
x662
645G
Armistice Area Apportionment
binary search
,
geometry
3200
x112
645F
Cowslip Collections
combinatorics
,
math
,
number theory
2500
x780
645E
Intellectual Inquiry
dp
,
greedy
,
strings
2200
x1240
645D
Robot Rapping Results Report
binary search
,
dp
,
graphs
1800
x2872
645C
Enduring Exodus
binary search
,
two pointers
1600
x3243
645B
Mischievous Mess Makers
greedy
,
math
1200
x3389
645A
Amity Assessment
brute force
,
constructive algorithms
,
implementation
1200
x3441
644C
Hostname Aliases
*special problem
,
binary search
,
data structures
,
implementation
,
sortings
,
strings
2100
x916
644B
Processing Queries
*special problem
,
constructive algorithms
,
data structures
,
two pointers
1700
x2691
644A
Parliament of Berland
*special problem
,
constructive algorithms
1000
x4434
643G
Choosing Ads
data structures
3200
x982
643F
Bears and Juice
dp
,
math
,
meet-in-the-middle
2900
x699
643E
Bear and Destroying Subtrees
dp
,
math
,
probabilities
,
trees
2700
x636
643D
Bearish Fanpages
2900
x314
643C
Levels and Regions
dp
2400
x1375
643B
Bear and Two Paths
constructive algorithms
,
graphs
1600
x3164
643A
Bear and Colors
implementation
1500
x4140
641G
Little Artem and Graph
2300
x91
641F
Little Artem and 2-SAT
3000
x192
641E
Little Artem and Time Machine
data structures
2000
x3214
641D
Little Artem and Random Variable
dp
,
implementation
,
math
,
probabilities
2400
x1238
641C
Little Artem and Dance
brute force
,
constructive algorithms
,
implementation
1800
x3072
641B
Little Artem and Matrix
implementation
1400
x3980
641A
Little Artem and Grasshopper
implementation
1000
x5898
639F
Bear and Chemistry
data structures
,
dfs and similar
,
graphs
,
trees
3300
x418
639E
Bear and Paradox
binary search
,
greedy
,
math
,
sortings
2800
x578
639D
Bear and Contribution
data structures
,
greedy
,
sortings
,
two pointers
2400
x966
639C
Bear and Polynomials
hashing
,
implementation
,
math
2200
x1200
639B
Bear and Forgotten Tree 3
constructive algorithms
,
graphs
,
trees
1600
x6496
639A
Bear and Displayed Friends
implementation
1200
x6145
638D
Three-dimensional Turtle Super Computer
brute force
,
dfs and similar
,
graphs
1800
x709
638C
Road Improvement
*special problem
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x1614
638B
Making Genome in Berland
*special problem
,
dfs and similar
,
strings
1500
x1962
638A
Home Numbers
*special problem
,
constructive algorithms
,
math
1100
x3856
637D
Running with Obstacles
*special problem
,
data structures
,
dp
,
greedy
1600
x1997
637C
Promocodes with Mistakes
*special problem
,
brute force
,
constructive algorithms
,
implementation
1400
x2420
637B
Chat Order
*special problem
,
binary search
,
constructive algorithms
,
data structures
,
sortings
1200
x16191
637A
Voting for Photos
*special problem
,
constructive algorithms
,
implementation
1000
x5402
635A
Orchestra
brute force
,
implementation
1100
x2883
634A
Island Puzzle
constructive algorithms
,
implementation
1300
x3305
633H
Fibonacci-ish II
data structures
,
implementation
3100
x591
633G
Yash And Trees
bitmasks
,
data structures
,
dfs and similar
,
math
,
number theory
2800
x770
633F
The Chocolate Spree
dfs and similar
,
dp
,
graphs
,
trees
2600
x964
633E
Startup Funding
binary search
,
constructive algorithms
,
data structures
,
probabilities
,
two pointers
2400
x583
633D
Fibonacci-ish
brute force
,
dp
,
hashing
,
implementation
,
math
2000
x2784
633C
Spy Syndrome 2
data structures
,
dp
,
hashing
,
implementation
,
sortings
,
string suffix structures
,
strings
1900
x2752
633B
A Trivial Problem
brute force
,
constructive algorithms
,
math
,
number theory
1300
x6657
633A
Ebony and Ivory
brute force
,
math
,
number theory
1100
x12659
632F
Magic Matrix
brute force
,
divide and conquer
,
graphs
,
matrices
,
trees
2400
x1074
632E
Thief in a Shop
divide and conquer
,
dp
,
fft
,
math
2400
x2742
632D
Longest Subsequence
brute force
,
math
,
number theory
2100
x3749
632C
The Smallest String Concatenation
sortings
,
strings
1700
x7700
632B
Alice, Bob, Two Teams
brute force
,
constructive algorithms
1400
x3982
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