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Before contest
Codeforces Round 941 (Div. 1)
18:19:26
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Before contest
Codeforces Round 941 (Div. 2)
18:19:25
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→ Filter Problems
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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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Problems
#
Name
158A
Next Round
*special problem
,
implementation
800
x231634
158B
Taxi
*special problem
,
greedy
,
implementation
1100
x82217
770A
New Password
*special problem
,
implementation
800
x18636
1331A
Is it rated?
*special problem
x16992
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
x14988
1505A
Is it rated - 2
*special problem
,
implementation
,
interactive
900
x13961
1812A
Are You a Robot?
*special problem
,
*special problem
,
*special problem
,
expression parsing
,
strings
x13036
1331D
Again?
*special problem
,
implementation
x11855
1663A
Who Tested?
*special problem
,
expression parsing
,
trees
x10384
158C
Cd and pwd commands
*special problem
,
data structures
,
implementation
1400
x8866
409H
A + B Strikes Back
*special problem
,
brute force
,
constructive algorithms
,
dsu
,
implementation
1500
x8656
522B
Photo to Remember
*special problem
,
data structures
,
dp
,
implementation
1100
x8643
1331B
Limericks
*special problem
,
math
,
number theory
x6976
411A
Password Check
*special problem
,
implementation
800
x6955
1505C
Fibonacci Words
*special problem
,
implementation
1400
x6290
158D
Ice Sculptures
*special problem
,
brute force
,
number theory
1300
x6169
1505B
DMCA
*special problem
,
implementation
,
number theory
1600
x5994
291A
Spyke Talks
*special problem
,
implementation
,
sortings
800
x5977
172A
Phone Code
*special problem
,
brute force
,
implementation
800
x5888
1812J
Unmysterious Language
*special problem
,
constructive algorithms
,
strings
x5783
1057A
Bmail Computer Network
*special problem
,
dfs and similar
,
trees
900
x5744
1663C
Pōja Verdon
*special problem
,
implementation
,
math
x5609
769A
Year of University Entrance
*special problem
,
implementation
,
sortings
800
x5565
1812B
Was it Rated?
*special problem
,
*special problem
,
*special problem
,
brute force
,
implementation
x5561
637A
Voting for Photos
*special problem
,
constructive algorithms
,
implementation
1000
x5304
644A
Parliament of Berland
*special problem
,
constructive algorithms
1000
x4376
171A
Mysterious numbers - 1
*special problem
,
constructive algorithms
1200
x4343
1812D
Trivial Conjecture
*special problem
,
constructive algorithms
,
math
,
number theory
x4331
159D
Palindrome pairs
*special problem
,
brute force
,
dp
,
strings
1500
x4247
774C
Maximum Number
*special problem
,
constructive algorithms
,
greedy
,
implementation
1200
x4018
1812E
Not a Geometry Problem
*special problem
,
*special problem
,
constructive algorithms
,
geometry
,
math
x3935
171B
Star
*special problem
,
combinatorics
1300
x3935
638A
Home Numbers
*special problem
,
constructive algorithms
,
math
1100
x3748
159B
Matchmaker
*special problem
,
greedy
,
sortings
1100
x3667
656A
Da Vinci Powers
*special problem
1900
x3552
1663B
Mike's Sequence
*special problem
,
divide and conquer
,
implementation
,
math
x3346
928A
Login Verification
*special problem
,
strings
1200
x3331
769B
News About Credit
*special problem
,
greedy
,
two pointers
1200
x3232
1331C
...And after happily lived ever they
*special problem
,
bitmasks
x3131
784A
Numbers Joke
*special problem
1700
x3108
291B
Command Line Arguments
*special problem
,
implementation
,
strings
1300
x3010
290A
Mysterious strings
*special problem
,
implementation
1400
x2941
522D
Closest Equals
*special problem
,
data structures
2000
x2939
159C
String Manipulation 1.0
*special problem
,
binary search
,
brute force
,
data structures
,
strings
1400
x2915
770B
Maximize Sum of Digits
*special problem
,
implementation
,
math
1300
x2718
172B
Pseudorandom Sequence Period
*special problem
,
implementation
,
number theory
1200
x2685
64A
Factorial
*special problem
,
implementation
1300
x2682
644B
Processing Queries
*special problem
,
constructive algorithms
,
data structures
,
two pointers
1700
x2601
523A
Rotate, Flip and Zoom
*special problem
,
implementation
1200
x2566
770C
Online Courses In BSU
*special problem
,
dfs and similar
,
graphs
,
implementation
1500
x2524
171D
Broken checker
*special problem
,
brute force
1300
x2507
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
x2453
409A
The Great Game
*special problem
1700
x2434
637C
Promocodes with Mistakes
*special problem
,
brute force
,
constructive algorithms
,
implementation
1400
x2409
290B
QR code
*special problem
,
implementation
1500
x2400
523D
Statistics of Recompressing Videos
*special problem
,
data structures
,
implementation
1600
x2235
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
929B
Места в самолёте
*special problem
,
implementation
1300
x2037
409F
000001
*special problem
1900
x2037
72G
Fibonacci army
*special problem
,
dp
1000
x1972
637D
Running with Obstacles
*special problem
,
data structures
,
dp
,
greedy
1600
x1948
409C
Magnum Opus
*special problem
1700
x1943
1346A
Color Revolution
*special problem
,
math
1000
x1939
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
1769A
Узкая дорога
*special problem
,
math
800
x1894
784E
Twisted Circuit
*special problem
,
brute force
,
implementation
2000
x1869
1057B
DDoS
*special problem
,
brute force
1400
x1782
290D
Orange
*special problem
,
implementation
1400
x1782
1431A
Selling Hamburgers
*special problem
800
x1780
1505E
Cakewalk
*special problem
,
greedy
,
implementation
,
shortest paths
1800
x1719
409D
Big Data
*special problem
1700
x1692
291C
Network Mask
*special problem
,
bitmasks
,
brute force
,
implementation
1600
x1663
656B
Scrambled
*special problem
,
implementation
1700
x1628
770D
Draw Brackets!
*special problem
,
implementation
1400
x1567
1910A
Username
*special problem
,
implementation
1100
x1536
130A
Hexagonal numbers
*special problem
,
implementation
900
x1518
290C
WTF?
*special problem
,
graph matchings
,
implementation
,
trees
1700
x1515
638C
Road Improvement
*special problem
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x1480
1505F
Math
*special problem
,
math
2200
x1471
291D
Parallel Programming
*special problem
,
greedy
1600
x1466
158E
Phone Talks
*special problem
,
dp
,
sortings
1900
x1449
1531A
Зингер | color
*special problem
,
implementation
x1443
171E
MYSTERIOUS LANGUAGE
*special problem
2000
x1396
1663D
Is it rated - 3
*special problem
,
combinatorics
,
dp
,
math
x1381
172D
Calendar Reform
*special problem
,
number theory
1500
x1381
1170A
Three Integers Again
*special problem
,
math
x1365
409B
Mysterious Language
*special problem
1700
x1341
1488A
From Zero To Y
*special problem
,
math
900
x1332
1769B1
Копирование файлов I
*special problem
,
brute force
,
implementation
,
math
1000
x1309
1387B1
Village (Minimum)
*special problem
,
dp
,
greedy
,
trees
2100
x1306
291E
Tree-String Problem
*special problem
,
dfs and similar
,
hashing
,
strings
2000
x1269
1211A
Three Problems
*special problem
,
implementation
1000
x1258
1663H
Cross-Language Program
*special problem
,
constructive algorithms
x1257
774K
Stepan and Vowels
*special problem
,
implementation
,
strings
1600
x1256
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