# Hackerrank “30 Days of Code” Çözümleri – Day 1: Data Types

Hackerrank’in 30 Days of Code içerisinde bulunan “Day 1: Data Types” sorusunun açıklaması ve çözümü. Bu soruda sizin konsol‘dan aldığınız int, double ve string tipinde değişkenlerini “+” operatörü kullanarak konsola yazdırmanız isteniyor.

► Hackerrank 30 Days of Code Çözümleri – Day 1: Data Types: https://www.hackerrank.com/challenges/30-data-types/problem

► Problem açıklaması:

Objective

Today, we’re discussing data types. Check out the Tutorial tab for learning materials and an instructional video!

Complete the code in the editor below. The variables , , and are already declared and initialized for you. You must:

1. Declare 3 variables: one of type int, one of type double, and one of type String.

2. Read 3 lines of input from stdin (according to the sequence given in the Input Format section below) and initialize your 3 variables.

3. Use the + operator to perform the following operations:

– Print the sum of i plus your int variable on a new line.

– Print the sum of d plus your double variable to a scale of one decimal place on a new line.

– Concatenate s with the string you read as input and print the result on a new line.

Note: If you are using a language that doesn’t support using + for string concatenation (e.g.: C), you can just print one variable immediately following the other on the same line. The string provided in your editor must be printed first, immediately followed by the string you read as input.

Input Format

The first line contains an integer that you must sum with i.

The second line contains a double that you must sum with d.

The third line contains a string that you must concatenate with s.

Output Format

Print the sum of both integers on the first line, the sum of both doubles (scaled to 1 decimal place) on the second line, and then the two concatenated strings on the third line.

Sample Input

12

4.0

is the best place to learn and practice coding!

Sample Output

16

8.0

HackerRank is the best place to learn and practice coding!

Explanation

When we sum the integers 4 and 12, we get the integer 16.

When we sum the floating-point numbers 4.0 and 4.0, we get 8.0.

When we concatenate HackerRank with is the best place to learn and practice coding!, we get HackerRank is the best place to learn and practice coding!.

You will not pass this challenge if you attempt to assign the Sample Case values to your variables instead of following the instructions above and reading input from stdin.

# Hackerrank “30 Days of Code” Çözümleri – Day 0: Hello, World.

Hackerrank‘in 30 Days of Code içerisinde bulunan “Day 0: Hello, World” sorusunun açıklaması ve çözümü. Bu soruda sizin console’dan alınan bir string’i yine console’a yeni bir satırda yazdırmanız isteniyor.

► Hackerrank 30 Days of Code Çözümleri – Day 0: Hello, World: https://www.hackerrank.com/challenges/30-hello-world/problem

► Problem açıklaması:

Objective

In this challenge, we review some basic concepts that will get you started with this series. You will need to use the same (or similar) syntax to read input and write output in challenges throughout HackerRank. Check out the Tutorial tab for learning materials and an instructional video!

To complete this challenge, you must save a line of input from stdin to a variable, print Hello, World. on a single line, and finally print the value of your variable on a second line.

You’ve got this!

Note: The instructions are Java-based, but we support submissions in many popular languages. You can switch languages using the drop-down menu above your editor, and the inputString variable may be written differently depending on the best-practice conventions of your submission language.

Input Format

A single line of text denoting inputString (the variable whose contents must be printed).

Output Format

Print Hello, World. on the first line, and the contents of inputString on the second line.

Sample Input

Welcome to 30 Days of Code!

Sample Output

Hello, World.

Welcome to 30 Days of Code!

Explanation

On the first line, we print the string literal Hello, World.. On the second line, we print the contents of the inputString variable which, for this sample case, happens to be Welcome to 30 Days of Code!. If you do not print the variable’s contents to stdout, you will not pass the hidden test case.

# LeetCode Çözümleri – 1185. Day of the Week [Zeller’s congruence]

LeetCode içerisinde bulunan “Day of the Week” sorusunun açıklaması ve çözümü. Bu soruda sizi verilen gün, ay ve yıl bilgilerine ait tarihin haftanın hangi güne denk geldiğini bulmanız isteniyor.

► LeetCode 1185. Day of the Week: https://leetcode.com/problems/day-of-the-week/

► Zeller’s congruence https://en.wikipedia.org/wiki/Zeller%27s_congruence

► Problem açıklaması:

Given a date, return the corresponding day of the week for that date.

The input is given as three integers representing the day, month and year respectively.

Return the answer as one of the following values {“Sunday”, “Monday”, “Tuesday”, “Wednesday”, “Thursday”, “Friday”, “Saturday”}.

Example 1: Input: day = 31, month = 8, year = 2019 Output: “Saturday”

Example 2: Input: day = 18, month = 7, year = 1999 Output: “Sunday”

Example 3: Input: day = 15, month = 8, year = 1993 Output: “Sunday”

Constraints: The given dates are valid dates between the years 1971 and 2100.

# LeetCode Çözümleri – 796. Rotate String

LeetCode içerisinde bulunan “Rotate String” sorusunun açıklaması ve çözümü. Bu soruda sizi verilen iki string‘ten, ilk string herhangi bir sayıda rotasyon ile ikinci string’e dönüşüp dönüşemeyeceği soruluyor.

► LeetCode 796. Rotate String: https://leetcode.com/problems/rotate-string/

► Problem açıklaması:

We are given two strings, s and goal.

A shift on s consists of taking string s and moving the leftmost character to the rightmost position. For example, if s = ‘abcde’, then it will be ‘bcdea’ after one shift on s. Return true if and only if s can become goal after some number of shifts on s.

Example 1:

Input: s = ‘abcde’, goal = ‘cdeab’

Output: true

Example 2:

Input: s = ‘abcde’, goal = ‘abced’

Output: false

Note:

s and goal will have length at most 100.