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Before contest
Codeforces Round 961 (Div. 2)
01:00:34
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→ Filter Problems
Difficulty:
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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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Problems
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Status
Standings
Custom test
Problems
#
Name
678C
Joty and Chocolate
implementation
,
math
,
number theory
1600
x9288
678B
The Same Calendar
implementation
1600
x4066
678A
Johny Likes Numbers
implementation
,
math
800
x12699
677E
Vanya and Balloons
binary search
,
brute force
,
dp
,
implementation
2300
x594
677D
Vanya and Treasure
data structures
,
dp
,
graphs
,
shortest paths
2300
x1549
677C
Vanya and Label
bitmasks
,
combinatorics
,
implementation
,
strings
1500
x6337
677B
Vanya and Food Processor
implementation
,
math
1400
x7580
677A
Vanya and Fence
implementation
800
x135321
676E
The Last Fight Between Human and AI
math
2400
x885
676D
Theseus and labyrinth
graphs
,
implementation
,
shortest paths
2000
x1856
676C
Vasya and String
binary search
,
dp
,
strings
,
two pointers
1500
x18445
676B
Pyramid of Glasses
implementation
,
math
,
math
1500
x5473
676A
Nicholas and Permutation
constructive algorithms
,
implementation
800
x13719
675E
Trains and Statistic
data structures
,
dp
,
greedy
2300
x2659
675D
Tree Construction
data structures
,
trees
1800
x3730
675C
Money Transfers
constructive algorithms
,
data structures
,
greedy
,
sortings
2100
x3617
675B
Restoring Painting
brute force
,
constructive algorithms
,
math
1400
x7343
675A
Infinite Sequence
math
1100
x14841
673B
Problems for Round
greedy
,
implementation
1300
x3505
673A
Bear and Game
implementation
800
x9985
672B
Different is Good
constructive algorithms
,
implementation
,
strings
1000
x17185
672A
Summer Camp
implementation
800
x15172
671E
Organizing a Race
data structures
,
greedy
3300
x403
671D
Roads in Yusland
data structures
,
dp
,
greedy
2900
x1130
671C
Ultimate Weirdness of an Array
data structures
,
number theory
2800
x679
671B
Robin Hood
binary search
,
greedy
2000
x2987
671A
Recycling Bottles
dp
,
geometry
,
greedy
,
implementation
1800
x4171
670F
Restore a Number
brute force
,
constructive algorithms
,
strings
2300
x848
670E
Correct Bracket Sequence Editor
data structures
,
dsu
,
strings
1700
x3176
670D2
Magic Powder - 2
binary search
,
implementation
1500
x13670
670D1
Magic Powder - 1
binary search
,
brute force
,
implementation
1400
x16867
670C
Cinema
implementation
,
sortings
1300
x9020
670B
Game of Robots
implementation
1000
x11087
670A
Holidays
brute force
,
constructive algorithms
,
greedy
,
math
900
x16690
669A
Little Artem and Presents
math
800
x10642
667B
Coat of Anticubism
constructive algorithms
,
geometry
1100
x5507
667A
Pouring Rain
geometry
,
math
1100
x7884
666E
Forensic Examination
data structures
,
string suffix structures
3100
x1360
666D
Chain Reaction
brute force
,
geometry
3000
x276
666C
Codeword
combinatorics
,
strings
2500
x774
666B
World Tour
graphs
,
shortest paths
2000
x2117
666A
Reberland Linguistics
dp
,
implementation
,
strings
1800
x3435
665F
Four Divisors
data structures
,
dp
,
math
,
number theory
,
sortings
,
two pointers
2400
x595
665E
Beautiful Subarrays
data structures
,
divide and conquer
,
strings
,
trees
2100
x2986
665D
Simple Subset
constructive algorithms
,
greedy
,
number theory
1800
x3329
665C
Simple Strings
dp
,
greedy
,
strings
1300
x9738
665B
Shopping
brute force
1400
x3508
665A
Buses Between Cities
implementation
1600
x2900
664A
Complicated GCD
math
,
number theory
800
x17847
663A
Rebus
constructive algorithms
,
expression parsing
,
greedy
,
math
1800
x3276
662E
To Hack or not to Hack
brute force
,
dp
,
greedy
3100
x135
662D
International Olympiad
constructive algorithms
,
greedy
,
implementation
,
math
2000
x1622
662C
Binary Table
bitmasks
,
brute force
,
divide and conquer
,
dp
,
fft
,
math
2600
x1984
662B
Graph Coloring
dfs and similar
,
graphs
2200
x1453
662A
Gambling Nim
bitmasks
,
math
,
matrices
,
probabilities
2400
x451
661H
Rotate Matrix
*special problem
2400
x68
661G
Hungarian Notation
*special problem
2200
x55
661F
Primes in Interval
*special problem
1900
x258
661E
Divisibility Check
*special problem
2000
x83
661D
Maximal Difference
*special problem
2100
x129
661C
Array Sum
*special problem
2000
x131
661B
Seasons
*special problem
1900
x227
661A
Lazy Caterer Sequence
*special problem
1300
x632
660F
Bear and Bowling 4
binary search
,
data structures
,
divide and conquer
,
geometry
,
ternary search
2500
x1583
660E
Different Subsets For All Tuples
combinatorics
,
math
2300
x1323
660D
Number of Parallelograms
geometry
1900
x3912
660C
Hard Process
binary search
,
dp
,
two pointers
1600
x9224
660B
Seating On Bus
implementation
1000
x5285
660A
Co-prime Array
greedy
,
implementation
,
math
,
number theory
1200
x8675
659G
Fence Divercity
combinatorics
,
dp
,
number theory
2300
x1021
659F
Polycarp and Hay
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2000
x1763
659E
New Reform
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x7389
659D
Bicycle Race
geometry
,
implementation
,
math
1500
x6242
659C
Tanya and Toys
greedy
,
implementation
1200
x11433
659B
Qualifying Contest
constructive algorithms
,
sortings
1300
x6221
659A
Round House
implementation
,
math
1000
x15517
658A
Bear and Reverse Radewoosh
implementation
800
x7021
656G
You're a Professional
*special problem
1900
x481
656F
Ace It!
*special problem
1900
x890
656E
Out of Controls
*special problem
2000
x721
656D
Rosetta Problem
*special problem
2100
x948
656C
Without Text
*special problem
2000
x684
656B
Scrambled
*special problem
,
implementation
1700
x1645
656A
Da Vinci Powers
*special problem
1900
x3585
653G
Move by Prime
combinatorics
,
math
,
number theory
3100
x524
653F
Paper task
data structures
,
string suffix structures
,
strings
2600
x976
653E
Bear and Forgotten Tree 2
dfs and similar
,
dsu
,
graphs
,
trees
2400
x1468
653D
Delivery Bears
binary search
,
flows
,
graphs
2200
x2378
653C
Bear and Up-Down
brute force
,
implementation
1900
x1632
653B
Bear and Compressing
brute force
,
dfs and similar
,
dp
,
strings
1300
x4926
653A
Bear and Three Balls
brute force
,
implementation
,
sortings
900
x8120
652F
Ants on a Circle
constructive algorithms
,
math
2800
x536
652E
Pursuit For Artifacts
dfs and similar
,
dsu
,
graphs
,
trees
2300
x2051
652D
Nested Segments
data structures
,
sortings
1800
x3892
652C
Foe Pairs
combinatorics
,
sortings
,
two pointers
1800
x3147
652B
z-sort
sortings
1000
x10005
652A
Gabriel and Caterpillar
implementation
,
math
1400
x4591
651B
Beautiful Paintings
greedy
,
sortings
1200
x11451
651A
Joysticks
dp
,
greedy
,
implementation
,
math
1100
x22750
650E
Clockwork Bomb
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
3200
x593
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