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Before contest
Codeforces Round 941 (Div. 1)
33:43:23
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Before contest
Codeforces Round 941 (Div. 2)
33:43:23
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→ Filter Problems
Difficulty:
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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
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Status
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Custom test
Problems
#
Name
158A
Next Round
*special problem
,
implementation
800
x231569
770A
New Password
*special problem
,
implementation
800
x18628
411A
Password Check
*special problem
,
implementation
800
x6952
291A
Spyke Talks
*special problem
,
implementation
,
sortings
800
x5976
172A
Phone Code
*special problem
,
brute force
,
implementation
800
x5888
769A
Year of University Entrance
*special problem
,
implementation
,
sortings
800
x5565
1769A
Узкая дорога
*special problem
,
math
800
x1893
1431A
Selling Hamburgers
*special problem
800
x1776
1571A
Sequence of Comparisons
*special problem
800
x1236
1505A
Is it rated - 2
*special problem
,
implementation
,
interactive
900
x13959
1057A
Bmail Computer Network
*special problem
,
dfs and similar
,
trees
900
x5743
130A
Hexagonal numbers
*special problem
,
implementation
900
x1518
1488A
From Zero To Y
*special problem
,
math
900
x1332
637A
Voting for Photos
*special problem
,
constructive algorithms
,
implementation
1000
x5304
644A
Parliament of Berland
*special problem
,
constructive algorithms
1000
x4376
72G
Fibonacci army
*special problem
,
dp
1000
x1971
1346A
Color Revolution
*special problem
,
math
1000
x1939
1769B1
Копирование файлов I
*special problem
,
brute force
,
implementation
,
math
1000
x1309
1211A
Three Problems
*special problem
,
implementation
1000
x1258
158B
Taxi
*special problem
,
greedy
,
implementation
1100
x82200
522B
Photo to Remember
*special problem
,
data structures
,
dp
,
implementation
1100
x8640
638A
Home Numbers
*special problem
,
constructive algorithms
,
math
1100
x3748
159B
Matchmaker
*special problem
,
greedy
,
sortings
1100
x3666
1910A
Username
*special problem
,
implementation
1100
x1535
1001A
Generate plus state or minus state
*special problem
1100
x1002
100A
Carpeting the Room
*special problem
,
implementation
1100
x883
162A
Pentagonal numbers
*special problem
,
implementation
1100
x789
188A
Hexagonal Numbers
*special problem
1100
x752
188D
Asterisks
*special problem
,
implementation
1100
x647
1115G1
AND oracle
*special problem
1100
x381
522A
Reposts
*special problem
,
dfs and similar
,
dp
,
graphs
,
trees
1200
x15691
637B
Chat Order
*special problem
,
binary search
,
constructive algorithms
,
data structures
,
sortings
1200
x14981
171A
Mysterious numbers - 1
*special problem
,
constructive algorithms
1200
x4343
774C
Maximum Number
*special problem
,
constructive algorithms
,
greedy
,
implementation
1200
x4018
928A
Login Verification
*special problem
,
strings
1200
x3331
769B
News About Credit
*special problem
,
greedy
,
two pointers
1200
x3232
172B
Pseudorandom Sequence Period
*special problem
,
implementation
,
number theory
1200
x2685
523A
Rotate, Flip and Zoom
*special problem
,
implementation
1200
x2566
1769C1
Подкрутка I
*special problem
,
brute force
,
dp
,
greedy
1200
x927
72C
Extraordinarily Nice Numbers
*special problem
,
math
1200
x856
683A
The Check of the Point
*special problem
,
geometry
1200
x785
1001H
Oracle for f(x) = parity of the number of 1s in x
*special problem
1200
x524
158D
Ice Sculptures
*special problem
,
brute force
,
number theory
1300
x6169
171B
Star
*special problem
,
combinatorics
1300
x3935
291B
Command Line Arguments
*special problem
,
implementation
,
strings
1300
x3010
770B
Maximize Sum of Digits
*special problem
,
implementation
,
math
1300
x2718
64A
Factorial
*special problem
,
implementation
1300
x2682
171D
Broken checker
*special problem
,
brute force
1300
x2507
929B
Места в самолёте
*special problem
,
implementation
1300
x2036
1769C2
Подкрутка II
*special problem
,
dp
1300
x909
188B
A + Reverse B
*special problem
,
implementation
1300
x701
1571B
Epic Novel
*special problem
,
math
1300
x674
661A
Lazy Caterer Sequence
*special problem
1300
x627
1001F
Distinguish multi-qubit basis states
*special problem
1300
x531
158C
Cd and pwd commands
*special problem
,
data structures
,
implementation
1400
x8866
1505C
Fibonacci Words
*special problem
,
implementation
1400
x6289
290A
Mysterious strings
*special problem
,
implementation
1400
x2941
159C
String Manipulation 1.0
*special problem
,
binary search
,
brute force
,
data structures
,
strings
1400
x2915
929A
Прокат велосипедов
*special problem
,
greedy
,
implementation
1400
x2491
928B
Chat
*special problem
,
dp
1400
x2489
523C
Name Quest
*special problem
,
greedy
1400
x2466
159A
Friends or Not
*special problem
,
greedy
,
implementation
1400
x2452
637C
Promocodes with Mistakes
*special problem
,
brute force
,
constructive algorithms
,
implementation
1400
x2409
1057B
DDoS
*special problem
,
brute force
1400
x1782
290D
Orange
*special problem
,
implementation
1400
x1782
770D
Draw Brackets!
*special problem
,
implementation
1400
x1567
1346B
Boot Camp
*special problem
,
greedy
1400
x1179
1431B
Polycarp and the Language of Gods
*special problem
,
implementation
,
two pointers
1400
x997
1769B2
Копирование файлов II
*special problem
,
binary search
,
brute force
,
math
1400
x853
1001B
Generate Bell state
*special problem
1400
x704
1001D
Distinguish plus state and minus state
*special problem
1400
x675
470A
Crystal Ball Sequence
*special problem
,
implementation
1400
x664
1001C
Generate GHZ state
*special problem
1400
x646
1001G
Oracle for f(x) = k-th element of x
*special problem
1400
x531
130B
Gnikool Ssalg
*special problem
,
implementation
,
strings
1400
x515
100C
A+B
*special problem
,
implementation
1400
x514
188E
HQ9+
*special problem
,
implementation
1400
x489
188C
LCM
*special problem
,
implementation
,
math
1400
x434
683D
Chocolate Bar
*special problem
,
math
1400
x319
188F
Binary Notation
*special problem
,
implementation
1400
x286
409H
A + B Strikes Back
*special problem
,
brute force
,
constructive algorithms
,
dsu
,
implementation
1500
x8653
159D
Palindrome pairs
*special problem
,
brute force
,
dp
,
strings
1500
x4247
770C
Online Courses In BSU
*special problem
,
dfs and similar
,
graphs
,
implementation
1500
x2524
290B
QR code
*special problem
,
implementation
1500
x2400
638B
Making Genome in Berland
*special problem
,
dfs and similar
,
strings
1500
x1926
774D
Lie or Truth
*special problem
,
constructive algorithms
,
implementation
,
sortings
1500
x1903
172D
Calendar Reform
*special problem
,
number theory
1500
x1381
172C
Bus
*special problem
,
implementation
,
sortings
1500
x1129
64B
Expression
*special problem
,
expression parsing
1500
x997
523B
Mean Requests
*special problem
,
implementation
1500
x940
1211B
Traveling Around the Golden Ring of Berland
*special problem
,
implementation
1500
x753
530A
Quadratic equation
*special problem
1500
x667
530C
Diophantine equation
*special problem
1500
x539
100B
Friendly Numbers
*special problem
,
implementation
1500
x534
130C
Decimal sum
*special problem
1500
x482
345A
Expecting Trouble
*special problem
,
probabilities
1500
x476
72I
Goofy Numbers
*special problem
,
implementation
1500
x454
1431D
Used Markers
*special problem
,
greedy
1500
x446
130D
Exponentiation
*special problem
1500
x381
100I
Rotation
*special problem
,
geometry
,
math
1500
x338
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