krisbobo / hackerrank

:computer: :pushpin: solutions and explanations to practice problems (algorithms, data structures, math, tutorials, language proficiency) on hackerrank in python.

<<<<<<< HEAD (Efficient!!) solutions to problems on HackerRank in Python. ======= My (Efficient!!) solutions to problems on HackerRank in Python and other languages . >>>>>>> 23ca07ed92c98673f4a9869fe94036744a487ffb

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Algorithms

#	Problem	Solution	Difficulty	Points	Sub domain
1	Solve me first	Solution	Easy	1	Warm up
2	Simple array sum	Solution	Easy	10	Warm up
3	Compare triplets	Solution	Easy	10	Warm up
4	A very big sum	Solution	Easy	10	Warm up
5	Diagonal differnce	Solution	Easy	10	Warm up
6	Plus Minus	Solution	Easy	10	Warm up
7	Staircase	Solution	Easy	10	Warm up
8	Mini-Max-Sum	Solution	Easy	10	Warm up
9	Birthday Cake Candles	Solution	Easy	10	Warm up
10	Time conversion	Solution	Easy	10	Warm up
11	Grading Students	Solution	Easy	10	Implementation
12	Apple and Orange	Solution	Easy	10	Implementation
13	Kangaroo	Solution	Easy	10	Implementation
14	Between two sets	Solution	Easy	10	Implementation
15	Breaking the records	Solution	Easy	10	Implementation
16	Birthday chocolate	Solution	Easy	10	Implementation
17	Divisible Sum pairs	Solution	Easy	10	Implementation
18	Mini-Max-Sum	Solution	Easy	10	Implementation
19	Migratory birds	Solution	Easy	10	Implementation
20	Bon Appetit	Solution	Easy	10	Implementation
21	Sock merchant	Solution	Easy	10	Implementation
22	Counting valleys	Solution	Easy	15	Implementation
23	Electronics shop	Solution	Easy	15	Implementation
24	Cats and a mouse	Solution	Easy	15	Implementation
25	Picking numbers	Solution	Easy	20	Implementation
26	The hurdle race	Solution	Easy	15	Implementation
27	Designer pdf viewer	Solution	Easy	20	Implementation
28	Utopian tree	Solution	Easy	20	Implementation
29	Angry professor	Solution	Easy	20	Implementation
30	Beautiful days at the movies	Solution	Easy	15	Implementation
31	Viral advertising	Solution	Easy	15	Implementation
32	Circular array rotation	Solution	Easy	20	Implementation
33	Sequence Equation	Solution	Easy	20	Implementation
34	Find digits	Solution	Easy	25	Implementation
35	Extra long factorials	Solution	Medium	20	Implementation
36	Serlock and squares	Solution	Easy	20	Implementation
37	Cut the sticks	Solution	Easy	25	Implementation
38	Equalize the array	Solution	Easy	20	Implementation
39	ACM ICPC Team	Solution	Easy	25	Implementation
40	Minimum distances	Solution	Easy	20	Implementation
41	Halloween sale	Solution	Easy	20	Implementation
42	The time in words	Solution	Medium	25	Implementation
43	Chocolate feast	Solution	Easy	25	Implementation
44	Manasa and stones	Solution	Easy	30	Implementation
45	Strange counter	Solution	Easy	30	Implementation
46	Super reduced string	Solution	Easy	10	Strings
47	CamelCase	Solution	Easy	15	Strings
48	Strong password	Solution	Easy	15	Strings
49	Caesar cipher	Solution	Easy	15	Strings
50	Mars exploration	Solution	Easy	15	Strings
51	HackerRank in a String!	Solution	Easy	20	Strings
52	Pangrams	Solution	Easy	20	Strings
53	Funny string	Solution	Easy	25	Strings
54	Gemstones	Solution	Easy	20	Strings
55	Alternating characters	Solution	Easy	20	Strings
56	Beautiful binary string	Solution	Easy	20	Strings
57	Two strings	Solution	Easy	25	Strings
57	Sherlock and the valid string	Solution	Easy	35	Strings
58	Big sorting	Solution	Easy	20	Sorting
59	Intro to tutorial challenges	Solution	Easy	30	Sorting
60	Insertion sort - part 1	Solution	Easy	30	Sorting
61	Insertion sort - part 2	Solution	Easy	30	Sorting
62	Correctness and the loop invariant	Solution	Easy	30	Sorting
63	Counting sort 1	Solution	Easy	30	Sorting
63	Counting sort 2	Solution	Easy	30	Sorting
64	Closest numbers	Solution	Easy	35	Sorting
65	Find the median	Solution	Easy	35	Sorting
66	Icre cream parlor	Solution	Easy	30	Search
67	Missing Numbers	Solution	Easy	45	Search
68	Pairs	Solution	Medium	50	Search
69	Sherlock and array	Solution	Easy	40	Search
70	Minimum absolute difference in an array	Solution	Easy	15	Greedy
71	Priyanka and toys	Solution	Easy	30	Greedy
72	Mark and toys	Solution	Easy	35	Greedy
73		Solution	Easy		Greedy
74	Max Min	Solution	Medium	35	Greedy
75	Jim and the orders	Solution	Easy	40	Greedy
76	Permuting two arrays	Solution	Easy	40	Greedy
77	Fibonacci Modified	Solution	Medium	45	Dynamic Programming
78	Lonely integer	Solution	Easy	20	Bit manipulation
79	Maximizing XOR	Solution	Easy	30	Bit manipulation
80	Flipping bits	Solution	Easy	40	Bit Manipulation
81	XOR strings	Solution	Easy	25	Debugging
82	Zig Zag sequence	Solution	Medium	40	Debugging
83	Smart Number	Solution	Easy	25	Debugging
84	Save the prisoner!	Solution	Easy	15	Implementation
85	Service lane	Solution	Easy	20	Implementation
86	Day of the Programmer	Solution	Easy	15	Implementation
87	Drawing Book	Solution	Easy	10	Implementation
88	Jumping on the clouds revisited	Solution	Easy	15	Implementation
89	Library Fine	Solution	Easy	15	Implementation
90	Marc's Cakewalk	Solution	Easy	15	Implementation
91	Repeated String	Solution	Easy	20	Implementation
92	Game of Thrones -I	Solution	Easy	30	Implementation
93	Running Time of Algorithms	Solution	Easy	30	Implementation
94	Flatland Space Stations	Solution	Easy	25	Implementation
95	Modified Kaprekar Numbers	Solution	Easy	30	Implementation
96	Append and Delete	Solution	Easy	20	Implementation
97	Jumping on the Clouds	Solution	Easy	20	Implementation
98	Taum and B'day	Solution	Easy	25	Implementation
99	Beautiful triplets	Solution	Easy	20	Implementation
100	The love letter mystery	Solution	Easy	20	Strings
101	Anagrams	Solution	Easy	25	Strings
102	Making anagrams	Solution	Easy	30	Strings
103	Grid Challenge	Solution	Easy	20	Greedy
104	Counter Game	Solution	Medium	30	Bit Manipulation
105	Cavity Map	Solution	Easy	30	Implementation
106	Prime Dates	Solution	Meidum	40	Debugging
107	Encryption	Solution	Meidum	30	Implementation
108	Matrix Layer Rotation	Solution	Hard	80	Implementation
109	Lisa's Workbook	Solution	Easy	25	Implementation
110	Luck Balance	Solution	Easy	20	Greedy
111	String Construction	Solution	Easy	25	Strings
112	Quicksort 1 - Partition	Solution	Easy	10	Sorting
113	Sherlock and The Beast	Solution	Easy	30	Greedy
114	Maximum Perimeter triangle	Solution	Easy	20	Greedy
115	Climbing the Leaderboard	Solution	Medium	20	Implementation
116	Largest Permutation	Solution	Easy	30	Greedy
117	Absolute Permutation	Solution	Medium	40	Implementation

Python

#	Problem	Solution	Difficulty	Points	Sub domain
1	Say "Hello, World!" With Python	Solution	Easy	5	Introduction
2	If-else	Solution	Easy	10	Introduction
3	arithmetic operators	Solution	Easy	10	Introduction
4	Division	Solution	Easy	10	Introduction
5	Loops	Solution	Easy	10	Introduction
6	Write a function	Solution	Medium	10	Introduction
7	Print function	Solution	Easy	20	Introduction
8	List comprehensions	Solution	Easy	10	Basic data types
9	Find the runner-up score!	Solution	Easy	10	Basic data types
10	Nested lists	Solution	Easy	10	Basic data types
11	Find the percentage	Solution	Easy	10	Basic data types
12	Lists	Solution	Easy	10	Basic data types
13	Tuples	Solution	Easy	10	Basic data types
14	sWAP cASE	Solution	Easy	10	Strings
15	String split and join	Solution	Easy	10	Strings
16	What's your name?	Solution	Easy	10	Strings
17	mutations	Solution	Easy	10	Strings
18	Find a string	Solution	Easy	10	Strings
19	String validators	Solution	Easy	10	Strings
20	Capitalize!	Solution	Easy	20	Strings
21	Introduction to sets	Solution	Easy	10	Sets
22	No Idea!	Solution	Medium	50	Sets
23	Symmetric difference	Solution	Easy	10	Sets
24	.add()	Solution	Easy	10	Sets
25	.discard(), .remove() & .pop()	Solution	Easy	10	Sets
26	.union() operation	Solution	Easy	10	Sets
27	.intersection() operation	Solution	Easy	10	Sets
28	.difference() operation	Solution	Easy	10	Sets
29	Set mutations	Solution	Easy	10	Sets
30	.symmetric_difference() operation	Solution	Easy	20	Sets
31	Check subset	Solution	Easy	10	Sets
32	Check strict superset	Solution	Easy	10	Sets

C++

#	Problem	Solution	Difficulty	Points	Sub domain
1	Say "Hello, World!" With C++	Solution	Easy	5	Introduction
2	Input and Output	Solution	Easy	5	Introduction
3	Basic Data Types	Solution	Easy	10	Introduction
4	Conditional Statements	Solution	Easy	10	Introduction
5	For Loop	Solution	Easy	10	Introduction
6	Functions	Solution	Easy	10	Introduction
7	Pointer	Solution	Easy	10	Introduction
8	Arrays Introduction	Solution	Easy	10	Introduction
9	Variable Sized Arrays	Solution	Easy	30	Introduction
10	Strings	Solution	Easy	10	Strings
11	StringStream	Solution	Easy	10	Strings
12	Class	Solution	Easy	10	Classes
13	Structs	Solution	Easy	10	Classes
14	Classes and objects	Solution	Easy	20	Classes
15	Box It!	Solution	Easy	30	Classes
16	Inherited Code	Solution	Medium	30	Classes
17	Exceptional Server	Solution	Medium	30	Classes
18	Virtual Functions	Solution	Medium	40	Classes
19	Vector-Sort	Solution	Easy	10	STL
20	Vector-Erase	Solution	Easy	10	STL

C

#	Problem	Solution	Difficulty	Points	Sub domain
1	Say "Hello, World!" in c	Solution	Easy	5	Introduction
2	Sum and difference of two numbers	Solution	Easy	5	Introduction
3	Functions in C	Solution	Easy	10	Introduction
4	Conditional Statements	Solution	Easy	10	Introduction
5	Pointers in C	Solution	Easy	10	Introduction

Contributing

If you are interested in helping or have a solution in a different language feel free to make a pull request. You can also reach me on through the following media if you want to talk.

• Email - [email protected]
• Follow me on twitter
• Let's connect on linkedin
• I'm on hackerrank as well