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Before contest
Codeforces Round 941 (Div. 1)
13:41:34
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Before contest
Codeforces Round 941 (Div. 2)
13:41:34
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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
1001I
Deutsch-Jozsa algorithm
*special problem
1700
x396
1001H
Oracle for f(x) = parity of the number of 1s in x
*special problem
1200
x524
1001G
Oracle for f(x) = k-th element of x
*special problem
1400
x531
1001F
Distinguish multi-qubit basis states
*special problem
1300
x531
1001E
Distinguish Bell states
*special problem
1600
x551
1001D
Distinguish plus state and minus state
*special problem
1400
x675
1001C
Generate GHZ state
*special problem
1400
x646
1001B
Generate Bell state
*special problem
1400
x704
1001A
Generate plus state or minus state
*special problem
1100
x1002
929C
Красивая команда
*special problem
,
combinatorics
,
math
1700
x1141
929B
Места в самолёте
*special problem
,
implementation
1300
x2037
929A
Прокат велосипедов
*special problem
,
greedy
,
implementation
1400
x2491
928D
Autocompletion
*special problem
,
strings
,
trees
1900
x800
928C
Dependency management
*special problem
,
graphs
,
implementation
1900
x879
928B
Chat
*special problem
,
dp
1400
x2489
928A
Login Verification
*special problem
,
strings
1200
x3331
927A
BuberPool Taxi Optimization
*special problem
,
interactive
2900
x1
784G
BF Calculator
*special problem
2000
x719
784F
Crunching Numbers Just for You
*special problem
,
implementation
1900
x991
784E
Twisted Circuit
*special problem
,
brute force
,
implementation
2000
x1869
784D
Touchy-Feely Palindromes
*special problem
,
implementation
1900
x423
784C
INTERCALC
*special problem
,
implementation
1800
x671
784B
Kids' Riddle
*special problem
2000
x829
784A
Numbers Joke
*special problem
1700
x3108
775A
University Schedule
*special problem
2900
774L
Bars
*special problem
,
binary search
2000
x321
774K
Stepan and Vowels
*special problem
,
implementation
,
strings
1600
x1256
774J
Stepan's Series
*special problem
,
dp
2000
x353
774I
Composing Of String
*special problem
,
dp
2300
x100
774H
Repairing Of String
*special problem
,
constructive algorithms
2200
x254
774G
Perfectionist Arkadiy
*special problem
,
number theory
2700
x173
774F
Pens And Days Of Week
*special problem
,
binary search
,
number theory
2700
x104
774E
Big Number and Remainder
*special problem
,
math
,
number theory
2300
x206
774D
Lie or Truth
*special problem
,
constructive algorithms
,
implementation
,
sortings
1500
x1903
774C
Maximum Number
*special problem
,
constructive algorithms
,
greedy
,
implementation
1200
x4018
774B
Significant Cups
*special problem
,
binary search
,
data structures
,
two pointers
2100
x216
774A
Amusement Park
*special problem
,
ternary search
2100
x294
770D
Draw Brackets!
*special problem
,
implementation
1400
x1567
770C
Online Courses In BSU
*special problem
,
dfs and similar
,
graphs
,
implementation
1500
x2524
770B
Maximize Sum of Digits
*special problem
,
implementation
,
math
1300
x2718
770A
New Password
*special problem
,
implementation
800
x18638
769D
k-Interesting Pairs Of Integers
*special problem
,
bitmasks
,
brute force
,
meet-in-the-middle
1700
x2208
769C
Cycle In Maze
*special problem
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1700
x2098
769B
News About Credit
*special problem
,
greedy
,
two pointers
1200
x3232
769A
Year of University Entrance
*special problem
,
implementation
,
sortings
800
x5565
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
x319
683C
Symmetric Difference
*special problem
1600
x314
683B
The Teacher of Physical Education
*special problem
1600
x316
683A
The Check of the Point
*special problem
,
geometry
1200
x785
661H
Rotate Matrix
*special problem
2400
x63
661G
Hungarian Notation
*special problem
2200
x50
661F
Primes in Interval
*special problem
1900
x230
661E
Divisibility Check
*special problem
2000
x78
661D
Maximal Difference
*special problem
2100
x124
661C
Array Sum
*special problem
2000
x126
661B
Seasons
*special problem
1900
x222
661A
Lazy Caterer Sequence
*special problem
1300
x627
656G
You're a Professional
*special problem
1900
x474
656F
Ace It!
*special problem
1900
x879
656E
Out of Controls
*special problem
2000
x716
656D
Rosetta Problem
*special problem
2100
x938
656C
Without Text
*special problem
2000
x675
656B
Scrambled
*special problem
,
implementation
1700
x1628
656A
Da Vinci Powers
*special problem
1900
x3552
644C
Hostname Aliases
*special problem
,
binary search
,
data structures
,
implementation
,
sortings
,
strings
2100
x908
644B
Processing Queries
*special problem
,
constructive algorithms
,
data structures
,
two pointers
1700
x2601
644A
Parliament of Berland
*special problem
,
constructive algorithms
1000
x4376
638C
Road Improvement
*special problem
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x1480
638B
Making Genome in Berland
*special problem
,
dfs and similar
,
strings
1500
x1926
638A
Home Numbers
*special problem
,
constructive algorithms
,
math
1100
x3748
637D
Running with Obstacles
*special problem
,
data structures
,
dp
,
greedy
1600
x1948
637C
Promocodes with Mistakes
*special problem
,
brute force
,
constructive algorithms
,
implementation
1400
x2409
637B
Chat Order
*special problem
,
binary search
,
constructive algorithms
,
data structures
,
sortings
1200
x14990
637A
Voting for Photos
*special problem
,
constructive algorithms
,
implementation
1000
x5304
530I
Different variables
*special problem
2500
x43
530H
Points in triangle
*special problem
,
geometry
2100
x119
530G
Levenshtein distance
*special problem
2100
x146
530F
Jumping frogs
*special problem
2100
x97
530E
Sum and product
*special problem
1700
x302
530D
Set subtraction
*special problem
1600
x446
530C
Diophantine equation
*special problem
1500
x539
530B
String inside out
*special problem
1600
x537
530A
Quadratic equation
*special problem
1500
x667
523D
Statistics of Recompressing Videos
*special problem
,
data structures
,
implementation
1600
x2235
523C
Name Quest
*special problem
,
greedy
1400
x2466
523B
Mean Requests
*special problem
,
implementation
1500
x940
523A
Rotate, Flip and Zoom
*special problem
,
implementation
1200
x2566
522D
Closest Equals
*special problem
,
data structures
2000
x2939
522B
Photo to Remember
*special problem
,
data structures
,
dp
,
implementation
1100
x8643
522A
Reposts
*special problem
,
dfs and similar
,
dp
,
graphs
,
trees
1200
x15692
470H
Array Sorting
*special problem
2300
x183
470G
Hamming Distance
*special problem
2300
x90
470F
Pairwise Sums
*special problem
2300
x96
470E
Chessboard
*special problem
1900
x191
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