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Codeforces Round 974 (Div. 3)
02:45:52
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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
685C
Optimal Point
binary search
,
math
2900
x582
685B
Kay and Snowflake
data structures
,
dfs and similar
,
dp
,
trees
1900
x4039
685A
Robbers' watch
brute force
,
combinatorics
,
dp
,
math
1700
x4219
683J
The Hero with Bombs
*special problem
3000
x40
683I
Loader
*special problem
,
graphs
2500
x38
683H
Exchange of Books
*special problem
1900
x95
683G
The Fraction
*special problem
1900
x130
683F
Reformat the String
*special problem
1800
x146
683E
Hammer throwing
*special problem
1800
x187
683D
Chocolate Bar
*special problem
,
math
1400
x322
683C
Symmetric Difference
*special problem
1600
x315
683B
The Teacher of Physical Education
*special problem
1600
x317
683A
The Check of the Point
*special problem
,
geometry
1200
x787
682E
Alyona and Triangles
geometry
,
two pointers
2600
x662
682D
Alyona and Strings
dp
,
strings
1900
x3286
682C
Alyona and the Tree
dfs and similar
,
dp
,
graphs
,
trees
1600
x7195
682B
Alyona and Mex
sortings
1200
x11342
682A
Alyona and Numbers
constructive algorithms
,
math
,
number theory
1100
x21542
681E
Runaway to a Shadow
geometry
,
sortings
2500
x461
681D
Gifts by the List
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2000
x1761
681C
Heap Operations
constructive algorithms
,
data structures
,
greedy
1600
x7690
681B
Economy Game
brute force
1300
x8887
681A
A Good Contest
implementation
800
x15376
680B
Bear and Finding Criminals
constructive algorithms
,
implementation
1000
x24242
680A
Bear and Five Cards
constructive algorithms
,
implementation
800
x12303
679E
Bear and Bad Powers of 42
data structures
3100
x683
679D
Bear and Chase
brute force
,
dfs and similar
,
graphs
,
implementation
,
math
,
probabilities
2900
x315
679C
Bear and Square Grid
dfs and similar
,
dsu
,
implementation
2400
x1152
679B
Bear and Tower of Cubes
binary search
,
dp
,
greedy
2200
x2139
679A
Bear and Prime 100
constructive algorithms
,
interactive
,
math
1400
x12925
678F
Lena and Queries
data structures
,
divide and conquer
,
geometry
2500
x871
678E
Another Sith Tournament
bitmasks
,
dp
,
math
,
probabilities
2200
x2194
678D
Iterated Linear Function
math
,
number theory
1700
x4489
678C
Joty and Chocolate
implementation
,
math
,
number theory
1600
x9371
678B
The Same Calendar
implementation
1600
x4104
678A
Johny Likes Numbers
implementation
,
math
800
x13239
677E
Vanya and Balloons
binary search
,
brute force
,
dp
,
implementation
2300
x603
677D
Vanya and Treasure
data structures
,
dp
,
graphs
,
shortest paths
2300
x1578
677C
Vanya and Label
bitmasks
,
combinatorics
,
implementation
,
strings
1500
x6396
677B
Vanya and Food Processor
implementation
,
math
1400
x7619
677A
Vanya and Fence
implementation
800
x139321
676E
The Last Fight Between Human and AI
math
2400
x887
676D
Theseus and labyrinth
graphs
,
implementation
,
shortest paths
2000
x1858
676C
Vasya and String
binary search
,
dp
,
strings
,
two pointers
1500
x18733
676B
Pyramid of Glasses
implementation
,
math
,
math
1500
x5491
676A
Nicholas and Permutation
constructive algorithms
,
implementation
800
x13802
675E
Trains and Statistic
data structures
,
dp
,
greedy
2300
x2726
675D
Tree Construction
data structures
,
trees
1800
x3779
675C
Money Transfers
constructive algorithms
,
data structures
,
greedy
,
sortings
2100
x3641
675B
Restoring Painting
brute force
,
constructive algorithms
,
math
1400
x7368
675A
Infinite Sequence
math
1100
x14924
673B
Problems for Round
greedy
,
implementation
1300
x3518
673A
Bear and Game
implementation
800
x10042
672B
Different is Good
constructive algorithms
,
implementation
,
strings
1000
x17314
672A
Summer Camp
implementation
800
x15291
671E
Organizing a Race
data structures
,
greedy
3300
x407
671D
Roads in Yusland
data structures
,
dp
,
greedy
2900
x1144
671C
Ultimate Weirdness of an Array
data structures
,
number theory
2800
x685
671B
Robin Hood
binary search
,
greedy
2000
x3015
671A
Recycling Bottles
dp
,
geometry
,
greedy
,
implementation
1800
x4177
670F
Restore a Number
brute force
,
constructive algorithms
,
strings
2300
x855
670E
Correct Bracket Sequence Editor
data structures
,
dsu
,
strings
1700
x3202
670D2
Magic Powder - 2
binary search
,
implementation
1500
x14173
670D1
Magic Powder - 1
binary search
,
brute force
,
implementation
1400
x17577
670C
Cinema
implementation
,
sortings
1300
x9100
670B
Game of Robots
implementation
1000
x11189
670A
Holidays
brute force
,
constructive algorithms
,
greedy
,
math
900
x16892
669A
Little Artem and Presents
math
800
x10764
667B
Coat of Anticubism
constructive algorithms
,
geometry
1100
x5606
667A
Pouring Rain
geometry
,
math
1100
x8006
666E
Forensic Examination
data structures
,
string suffix structures
3100
x1393
666D
Chain Reaction
brute force
,
geometry
3000
x279
666C
Codeword
combinatorics
,
strings
2500
x781
666B
World Tour
graphs
,
shortest paths
2000
x2159
666A
Reberland Linguistics
dp
,
implementation
,
strings
1800
x3466
665F
Four Divisors
data structures
,
dp
,
math
,
number theory
,
sortings
,
two pointers
2400
x609
665E
Beautiful Subarrays
data structures
,
divide and conquer
,
strings
,
trees
2100
x3116
665D
Simple Subset
constructive algorithms
,
greedy
,
number theory
1800
x3473
665C
Simple Strings
dp
,
greedy
,
strings
1300
x10215
665B
Shopping
brute force
1400
x3534
665A
Buses Between Cities
implementation
1600
x2922
664A
Complicated GCD
math
,
number theory
800
x18086
663A
Rebus
constructive algorithms
,
expression parsing
,
greedy
,
math
1800
x3288
662E
To Hack or not to Hack
brute force
,
dp
,
greedy
3100
x138
662D
International Olympiad
constructive algorithms
,
greedy
,
implementation
,
math
2000
x1629
662C
Binary Table
bitmasks
,
brute force
,
divide and conquer
,
dp
,
fft
,
math
2600
x2007
662B
Graph Coloring
dfs and similar
,
graphs
2200
x1470
662A
Gambling Nim
bitmasks
,
math
,
matrices
,
probabilities
2400
x465
661H
Rotate Matrix
*special problem
2400
x69
661G
Hungarian Notation
*special problem
2200
x56
661F
Primes in Interval
*special problem
1900
x319
661E
Divisibility Check
*special problem
2000
x84
661D
Maximal Difference
*special problem
2100
x132
661C
Array Sum
*special problem
2000
x132
661B
Seasons
*special problem
1900
x228
661A
Lazy Caterer Sequence
*special problem
1300
x637
660F
Bear and Bowling 4
binary search
,
data structures
,
divide and conquer
,
geometry
,
ternary search
2500
x1627
660E
Different Subsets For All Tuples
combinatorics
,
math
2300
x1498
660D
Number of Parallelograms
geometry
1900
x3968
660C
Hard Process
binary search
,
dp
,
two pointers
1600
x9318
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