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Before contest
Codeforces Round 950 (Div. 3)
18:09:43
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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
#
Name
523D
Statistics of Recompressing Videos
*special problem
,
data structures
,
implementation
1600
x2252
523C
Name Quest
*special problem
,
greedy
1400
x2469
523B
Mean Requests
*special problem
,
implementation
1500
x943
523A
Rotate, Flip and Zoom
*special problem
,
implementation
1200
x2591
522D
Closest Equals
*special problem
,
data structures
2000
x2982
522B
Photo to Remember
*special problem
,
data structures
,
dp
,
implementation
1100
x8703
522A
Reposts
*special problem
,
dfs and similar
,
dp
,
graphs
,
trees
1200
x15782
470H
Array Sorting
*special problem
2300
x186
470G
Hamming Distance
*special problem
2300
x93
470F
Pairwise Sums
*special problem
2300
x99
470E
Chessboard
*special problem
1900
x194
470D
Caesar Cipher
*special problem
1900
x149
470C
Eval
*special problem
1900
x234
470B
Hexakosioihexekontahexaphobia
*special problem
1800
x254
470A
Crystal Ball Sequence
*special problem
,
implementation
1400
x667
411A
Password Check
*special problem
,
implementation
800
x7027
409I
Feed the Golorp
*special problem
2400
x117
409H
A + B Strikes Back
*special problem
,
brute force
,
constructive algorithms
,
dsu
,
implementation
1500
x8704
409G
On a plane
*special problem
,
geometry
2200
x504
409F
000001
*special problem
1900
x2046
409E
Dome
*special problem
1800
x563
409D
Big Data
*special problem
1700
x1697
409C
Magnum Opus
*special problem
1700
x1948
409B
Mysterious Language
*special problem
1700
x1344
409A
The Great Game
*special problem
1700
x2438
345G
Suffix Subgroup
*special problem
,
strings
2200
x53
345F
Superstitions Inspection
*special problem
2700
x45
345E
Black Cat Rush
*special problem
2700
x45
345D
Chain Letter
*special problem
,
dfs and similar
,
graphs
2200
x77
345C
Counting Fridays
*special problem
2000
x124
345B
Triskaidekaphobia
*special problem
2100
x123
345A
Expecting Trouble
*special problem
,
probabilities
1500
x478
291E
Tree-String Problem
*special problem
,
dfs and similar
,
hashing
,
strings
2000
x1280
291D
Parallel Programming
*special problem
,
greedy
1600
x1468
291C
Network Mask
*special problem
,
bitmasks
,
brute force
,
implementation
1600
x1666
291B
Command Line Arguments
*special problem
,
implementation
,
strings
1300
x3016
291A
Spyke Talks
*special problem
,
implementation
,
sortings
800
x5995
290F
Greedy Petya
*special problem
,
dfs and similar
,
graphs
,
greedy
2800
x128
290E
HQ
*special problem
,
constructive algorithms
2500
x197
290D
Orange
*special problem
,
implementation
1400
x1785
290C
WTF?
*special problem
,
graph matchings
,
implementation
,
trees
1700
x1520
290B
QR code
*special problem
,
implementation
1500
x2406
290A
Mysterious strings
*special problem
,
implementation
1400
x2954
188H
Stack
*special problem
,
expression parsing
,
implementation
1800
x245
188G
Array Sorting
*special problem
,
implementation
1600
x326
188F
Binary Notation
*special problem
,
implementation
1400
x289
188E
HQ9+
*special problem
,
implementation
1400
x491
188D
Asterisks
*special problem
,
implementation
1100
x659
188C
LCM
*special problem
,
implementation
,
math
1400
x435
188B
A + Reverse B
*special problem
,
implementation
1300
x705
188A
Hexagonal Numbers
*special problem
1100
x765
172E
BHTML+BCSS
*special problem
,
dfs and similar
,
expression parsing
2200
x269
172D
Calendar Reform
*special problem
,
number theory
1500
x1383
172C
Bus
*special problem
,
implementation
,
sortings
1500
x1130
172B
Pseudorandom Sequence Period
*special problem
,
implementation
,
number theory
1200
x2692
172A
Phone Code
*special problem
,
brute force
,
implementation
800
x5914
171H
A polyline
*special problem
,
implementation
1700
x267
171G
Mysterious numbers - 2
*special problem
1600
x896
171F
ucyhf
*special problem
,
brute force
,
implementation
,
number theory
1600
x1253
171E
MYSTERIOUS LANGUAGE
*special problem
2000
x1406
171D
Broken checker
*special problem
,
brute force
1300
x2524
171C
A Piece of Cake
*special problem
,
implementation
2000
x1054
171B
Star
*special problem
,
combinatorics
1300
x3956
171A
Mysterious numbers - 1
*special problem
,
constructive algorithms
1200
x4367
162J
Brackets
*special problem
1800
x90
162I
Truncatable primes
*special problem
2000
x74
162H
Alternating case
*special problem
1800
x214
162G
Non-decimal sum
*special problem
2000
x57
162F
Factorial zeros
*special problem
1800
x196
162E
HQ9+
*special problem
1800
x175
162D
Remove digits
*special problem
1900
x226
162C
Prime factorization
*special problem
1800
x774
162B
Binary notation
*special problem
1800
x309
162A
Pentagonal numbers
*special problem
,
implementation
1100
x796
159E
Zebra Tower
*special problem
,
data structures
,
greedy
,
sortings
1700
x992
159D
Palindrome pairs
*special problem
,
brute force
,
dp
,
strings
1500
x4259
159C
String Manipulation 1.0
*special problem
,
binary search
,
brute force
,
data structures
,
strings
1400
x2923
159B
Matchmaker
*special problem
,
greedy
,
sortings
1100
x3686
159A
Friends or Not
*special problem
,
greedy
,
implementation
1400
x2459
158E
Phone Talks
*special problem
,
dp
,
sortings
1900
x1452
158D
Ice Sculptures
*special problem
,
brute force
,
number theory
1300
x6185
158C
Cd and pwd commands
*special problem
,
data structures
,
implementation
1400
x8927
158B
Taxi
*special problem
,
greedy
,
implementation
1100
x83063
158A
Next Round
*special problem
,
implementation
800
x234752
153E
Euclidean Distance
*special problem
2100
x74
153D
Date Change
*special problem
2000
x82
153C
Caesar Cipher
*special problem
2200
x365
153B
Binary notation
*special problem
1800
x153
153A
A + B
*special problem
1600
x762
130J
Date calculation
*special problem
1800
x324
130I
Array sorting
*special problem
,
sortings
2300
x165
130H
Balanced brackets
*special problem
1600
x539
130G
CAPS LOCK ON
*special problem
1700
x274
130F
Prime factorization
*special problem
1600
x274
130E
Tribonacci numbers
*special problem
1600
x293
130D
Exponentiation
*special problem
1500
x383
130C
Decimal sum
*special problem
1500
x486
130B
Gnikool Ssalg
*special problem
,
implementation
,
strings
1400
x517
130A
Hexagonal numbers
*special problem
,
implementation
900
x1526
100J
Interval Coloring
*special problem
,
greedy
,
math
2400
x61
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