43
kdim
● 17 ● 43 ● 60 Leader of the month
13161/ 14193
Dmitry Khromenko
Last seen 16 hours ago
Member for 3 years, 4 months, 16 days
Difficulty Normal
I study Python myself and help my son and daughter learn programming.

Missions (443) / Solutions (439)
 Initiation
Easy Unpack
28
 19 21
The Most Frequent
26
 8 19
Correct Sentence
20
 29 13
All the Same
53
 11 17
Multiply (Intro)
42
 8 35
Between Markers (simplified)
31
 4 24
First Word (simplified)
20
 16 13
Nearest Value
58
 6 48
Split Pairs
50
 10 24
Replace First
25
 12 18
Remove All Before
17
 37 10
End Zeros
28
 11 21
Number Length
18
 20 11
Backward String
26
 35 19
All Upper I
18
 39 11
Beginning Zeros
43
 4 33
Max Digit
18
 30 11
Sum Numbers
23
 11 16
Count Digits
45
 4 38
Acceptable Password I
32
 6 25
Is Even
23
 8 16
 Home
Non-unique Elements
38
 248 15
Even the Last
24
 132 17
Three Words
23
 129 16
Pawn Brotherhood
68
 68 32
Right to Left
23
 124 16
Days Between
28
 75 21
Bigger Price
18
 84 8
Second Index
19
 55 9
Between Markers
21
 29 11
First Word
27
 18 17
Popular Words
22
 21 12
Date and Time Converter
38
 8 18
Morse Decoder
39
 7 29
Sun Angle
58
 6 22
Sort Array by Element Frequency
25
 29 15
Split List
59
 5 23
Backward Each Word
23
 12 13
Changing direction
38
 8 10
Missing Number
102
 1 33
Duplicate Zeros
97
 2 14
 Electronic Station
Find Sequence
52
 27 16
Brackets
78
 93 14
Mathematically Lucky Tickets
43
 8 7
Digits Multiplication
19
 172 9
Verify Anagrams
28
 497 2
Can You Pass?
89
 5 15
Boolean Algebra
50
 35 14
Inside Block
90
 2 26
Unix Match. Part 1
139
 1 75
Unix Match. Part 2
92
 8 12
Ascending List
21
 16 11
Surjection Strings
51
 11 15
Remove Brackets
47
 9 11
Similar Triangles
91
 5 27
Words Order
21
 16 11
All Upper II
7
 235 1
Sort by Extension
48
 14 12
Acceptable Password II
25
 9 15
Acceptable Password III
31
 4 21
Acceptable Password IV
23
 5 13
Acceptable Password V
35
 2 25
Acceptable Password VI
28
 5 18
Blood distribution
12
 Scientific Expedition
Morse Clock
57
 19 16
The Most Wanted Letter
29
 21 19
Striped Words
43
 72 7
The Hidden Word
51
 19 10
Common Words
29
 31 19
Absolute Sorting
15
 217 8
Cipher Map
65
 13 24
Remove Accents
16
 27 6
Call to Home
37
 79 3
Bird Language
18
 124 8
Letter Queue
24
 7 14
I Love Python!
20
 132 13
Secret Message
44
 203 8
Pangram
31
 25 21
Follow Instructions
31
 9 21
Conversion into CamelCase
23
 13 13
Conversion from CamelCase
19
 35 9
Time Converter (24h to 12h)
62
 7 7
Caps Lock
26
 5 16
YAML. Simple Dict
50
 6 14
YAML. More Types
56
 6 15
Sum by Type
29
 5 8
Goes Right After
40
 4 30
Convert and Aggregate
75
 1 47
Nonogram Encode
32
 1 5
Latest ISO datetime
20
 5 6
Beat The Previous
9
 37
Count Vowels
12
 9 4
Convert To Title Case
20
 7 6
Replace All Occurrences
12
 17 1
Longest Substring of Unique Characters
19
 7 2
Count Substring Occurrences
16
 8 3
Fuzzy String Matching
19
 12 2
Combining Celebrity Names
18
 5 4
Water Sort Game
12
 8
 O'Reilly
Loading Cargo
92
 5 18
Determine the Order
30
 198
Median
19
 227 9
Cipher Crossword
40
 24 1
Xs and Os Referee
24
 308 4
Parse Array
30
Flatten a List
24
 284 4
The Flat Dictionary
20
 200
Index Power
13
 280 6
Count Inversions
14
 88 4
Frequency Sorting
18
 35 8
Time Converter (12h to 24h)
76
 4 40
Flatten a List (iterator version)
12
Flatten a List (generator version)
12
Median of Three
18
 15 8
Reverse Every Ascending
23
 13 13
How Deep
47
 11 11
Replace Last
35
 4 28
Compress List
18
 34 8
Remove All After
28
 4 21
Majority
62
 2 52
Chunk
15
 34 5
Sort Except Zero
39
 40 5
Lightbulb Intro
65
 3 29
Lightbulb Start Watching
48
 9 12
Lightbulb End Watching
39
 7 5
Multiple Lightbulbs
53
 2 12
Lightbulb Operating
46
 5 6
Lightbulb More
46
 2 6
The Final Stone
30
 6 9
Integer Palindrome
19
 11 5
Sum of Digits
90
 1 42
Knapsack Problem
36
 2 8
The Hollow Diamond
12
 18
Exploring Wythoff Array
15
Flip of Time
12
 9
Ordinary Cardinals
12
 28
Grid Painting
32
 1 5
Archipelago
15
 4
Matrix-2-String
9
 20
String-2-Matrix
9
 20
 Incinerator
Building Base
15
3 Chefs
15
Multicolored Lamp
44
 29 8
Voice TV Control
15
The Warriors
50
 24 14
Army Battles
50
 11 14
The Defenders
61
 2 25
The Vampires
18
 5 8
The Lancers
20
The Healers
20
 Mine
Determinant
8
 68
Disposable Teleports
36
 21 4
Binary Count
22
 127 12
Fizz Buzz
33
 103 26
Achilles and the Tortoise
16
 12 9
The Greatest Common Divisor
23
 38 7
Moore Neighbourhood
26
 18 16
Color Map
37
 26 3
The Einstein Problem-Lite
15
Currency Style
8
What Is Wrong With This Family?
76
 3 35
Find Enemy
63
 13 5
Cut Sentence
19
 17 9
Bigger Together
10
 48 1
Domino Chain
19
 7 9
Best Stock
20
 46 10
Caesar Cipher (encryptor)
13
 167 3
Caesar Cipher (decryptor)
8
 197
Chess Knight
50
 5 14
Chemical Analysis
19
 6 2
Fast Train
20
 4 10
Can Balance
32
 45 3
Escape
27
 16 1
Aggregate by Operation
19
 17 2
Adjacent Letters
27
 15 3
Long Pressed
29
 7
Switch Keys to Values
27
 2 13
Replace with Biggest
20
 3 6
Matrix "Hatching"
19
 4 2
Fibonacci Poem
29
 1 14
Toothpicks
41
 1 13
Ulam–Warburton Automaton
12
 1
Ulam-Warburton Automaton Hex
27
 6 6
Count Morse
43
 1 22
Cut Into Squares
32
 1 5
Checking Perfect Power
12
Rectangle Perimeter
7
 13 4
Number With Exclamation
6
 37
Longest Common Prefix
16
 3 3
Find Remainder
10
 17 2
Integer Sign Determination
9
 8 6
Postfix Evaluation
9
 21
 Ice Base
Roman Numerals
15
Counting Tiles
8
 256
Feed Pigeons
13
 201 3
The Most Numbers
20
 156 10
How to Find Friends
43
 69 7
Oil Pie
17
 7 7
Monkey Typing
32
 10 22
Clock Angle
15
 260
Making Change
15
 126
Largest Rectangle in a Histogram
15
 5 5
Reverse Roman Numerals
15
Long Repeat
20
 36 10
Identify Block
51
 4 10
Morse Encoder
21
 21 11
Find Quotes
25
 10 15
Count Chains
60
 3 24
Write Quadratic Equation
47
 1 26
Move Zeros
29
 8 5
One Switch Strings
14
 6 2
Correct Capital
14
 27 2
Interesting, intersecting
12
 38
When "k" is Enough!
30
 10 4
Not in Order
9
 39
Is String a Number?
72
 1 27
Is String a Number? (Part II)
15
 32
Reveal the Number
38
 1 24
Close Enough
26
 1 5
Leap Year Checking
12
 23 1
Quadratic Equation Roots
9
 20
Perfect Number Checking
9
 34
Cleaning Robot
12
 1
Count And Say
9
 28
The Centrifuge Problem
12
 6
 Alice In Wonderland
Transposed Matrix
44
 16 8
The Shortest Knight's Path
59
 9 4
Multiplication Table
25
 6 15
Digits Doublets
15
IP Network: Route Summarization
15
Long Non Repeat
17
 19 7
The Fastest Horse
8
When is Friday?
15
 35 5
Middle Characters
25
 6 15
Zigzag Array
21
 6 11
Swap Nodes
51
 17 10
Flood Area
15
YAML. List and Comments
20
 34
YAML. Complex Structure
74
 2 10
Tree Walker
48
 6 7
Peaceable Queens
36
 2 8
15-puzzle Solvability
12
 16
Count Domino Tilings
12
 5
R-mahjong Ⅰ: break hand into sets
12
Bishop vs Aliens
22
 1 3
 GitHub
Solution for Anything
32
 73 3
Open Labyrinth
59
 129 4
Area of a Convex Polygon
46
 18 6
The End of Other
20
 9 13
Painting Wall
44
 18 5
Shooting Range
13
 20 3
Xs and Os Champion
22
 6 1
Broken Clock
20
 130
The Most Frequent Weekdays
17
 33 7
Cookies
21
 8 11
Power Supply
44
 11 5
Merge Intervals
9
 160
Create Intervals
15
 30 5
Simplify Unix Path
81
 2 7
Long Repeat Inside
10
 80 1
Barcode Reader
39
 4 5
The Highest Building
15
 35 5
Paper Dice
27
 10 1
Create Intervals (iterator version)
9
Expand Intervals
28
 96 2
The Cheapest Flight
22
 7 12
Evenly Spaced Trees
8
 84
Power Plants
15
 26
Searchlights
48
 2 7
 Dropbox
Speech Module
13
 373 3
The Best Number Ever
5
 201
Three Points Circle
45
 27 9
Numbers Factory
25
 22 15
URL Normalization
20
 54
Hubspot Amulet
46
 6 6
Humpty Dumpty Form
39
 38 5
Friendly Number
8
Simple Hashlib
21
 8 14
Place Queens
22
 18 1
The Longest Palindromic
24
 27 14
Nonogram Row
15
 34
Worth of Words
17
 13 10
Text Formatting
8
 84
On the same path
39
 8 5
Atbash Cipher
10
 20 3
Scytale Encryption
12
 21 2
Rotating Grille Cipher
15
 29
Grille Cipher Attack
111
 1 5
Playfair Cipher Attack
60
Common Tail
16
 14 3
Sort Sorted Groups
15
 23
Calculator-I
34
 6 6
Calculator-II
15
Huffman Encode
15
 21
Calculator-IV
15
Calculator-VII
15
e+pi
12
 13
Count Squares
12
 10
Sum of Distinct Cubes
12
The Longest Word
10
 12 2
All Permutations
9
 19
Sum of Integers
9
 28
Reverse Integer
19
 13 5
Armstrong Number Checking
21
 4 7
Maximum Among Three
6
 23
Count Divisibles in Range (simplified)
6
 20
Tricky String
16
 7 3
Revorse the vewels
9
 22
Frogs Collision
9
 16
 PyCon TW
House Password
16
 302 6
Building Visibility
8
 11
Calculate Islands
15
 331
How Much Gold
15
 27
Express Delivery
60
Golden Pyramid
15
 64 5
Simple Areas
15
 59 5
Network Attack
8
 356
Digit Stack
8
 634
Robot Sort
13
 18 3
Dark Labyrinth
20
Unfair Districts
15
Double Substring
13
 71 3
Ryerson Letter Grade
11
 26 4
Sum Consecutives
8
 154
Fused Cubes
30
OOP 1: First Look at Class and Object
5
OOP 2: Class Attributes
5
OOP 3: Initializing
5
OOP 4: Adding Methods
5
OOP 5: Parent - Child
5
OOP 6: Overriding Methods
5
OOP 7: Adding Parameters
5
 Storage
Skew-symmetric Matrix
11
 134 4
Restricted Prime
16
 14 6
Word Pattern
12
 16 5
Square Spiral
39
 10 5
Weak Point
5
 602
Mind Switcher
30
Playfair Cipher
15
 108
Hexagon Spiral
20
 33
Group Equal consecutive
15
 51 5
List Beautify
12
 25
Working Hours Calculator
35
 2 7
 Maya
Visibilities
20
Roll the cube
57
 2 5
 HubSpot
Restricted Sum
12
 222 5
Auto Painting
15
 136
Number Base
51
 124 15
The Hamming Distance
13
 257 3
Expected Dice
20
Repeating Decimals
8
 104
Supply Stations
20
Node Disconnected Users
55
 6 9
New Cities
22
 52 1
City's Happiness
20
 85
Supply Line
48
 26 2
Square Board
8
 65
Inscribe a Contour
20
 5
Univocalic davasaan
11
 13 4
Non Empty Lines
5
 137
Team Play
12
 37
Workout
40
 4 4
Triangular Islands
42
 8 5
Weekly Calendar
32
 15 3
Next Birthday
15
 Blizzard
Radiation Search
15
 164
Stair Steps
17
 20 7
Spaceship Landing Strip
15
 94
The Angles of a Triangle
21
 89 11
Weekend Counter
8
Sudoku Solver
39
 7 5
Palindromic Palindrome
63
 12 5
Min and Max
14
 225 4
Safe Coasts
20
 103
Unlucky Days
9
 103 2
String Conversion
15
 162
Stressful Subject
26
 13 16
The First Working Day
12
 23 5
Rectangles Union
16
 17 6
Useless Flights
20
 50
Permutation Index
32
 21 3
Reversed Permutation Index
15
 71
Connect Stars
25
 38
Mountain Scape
32
 3 5
Checkers Capture
12
 13
 Rock
Super Root
20
 8 10
Crossword Solver
20
Parity Bit Generator
8
Sort by Removing
24
 33 2
Park Benches
44
 4 5
Greedy Number
20
 40
Fibonacci Spiral's End
19
 2
Garland
12
 10
 Shelter
Ghosts Age
14
 116 4
One line Drawing
15
 77
Completely Empty
46
 22 6
The Nearest Square Number
21
 7 11
Seven Segment
15
 238
Delivery Drone
20
 37
Landing Site
44
 5 5
Halloween Monsters
49
 1 13
Four To The Floor
18
 4 8
 Codeship
8 Puzzle
30
Snake Lite
30
Probably Dice
30
Ugly Numbers
20
Rolling 🎲!
30
 3 9
Champernowne Word
31
 1 10
 Hermit
Ore In The Desert
60
 76
The Good Radix
8
 253
Colder-Warmer
59
 16 4
Simplification
60
 8
Break Rings
87
 81 2
Network Loops
28
 20 2
Strawberry Fields
20
 37
Fractions Addition
32
 19 3
Count Consecutive Summers
28
 122 2
Stacking Cubes
37
 8 3
Shorter Set
16
 13 5
Birthday Party
9
 5 2
Stock Profit
5
 71
Excel Column Number
8
 60
Unique Email Addresses
9
 57
Backspace Apply
19
 9 5
 Watchtower
Funny Addition
11
 179 4
Convex Hull
15
 91
Rotate Hole
8
 528
Stepping Stones Puzzle
15
 7
 Escher
The Ship Teams
14
 86 4
Ground for the House
22
 143 1
Compass, Map and Spyglass
8
 255
The Stone Wall
8
 231
Wild Dogs
15
 140
The Secret Room
8
 135
Keys and Locks
15
 97
Safe Code
15
 18 5
Treasures
12
 37 2
The Stones
15
 82
Card Game
8
 75
The Buttons
15
 64
Graphical Key
20
Hypercube
15
 59
The Tower
20
 Not On Map
Welcome Email by SendGrid
5
SendGrid Spam Reports
40
SendGrid Geo Stats
5
Most Wanted Letter
0
 10 5
Correct WhatsUp
40
Aggregate and Count
15
 69
Length of the String
10
 13 3