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https://github.com/psingh12354/hackerrank-certification

HackerRank Certification Question
https://github.com/psingh12354/hackerrank-certification

adder anagram average class code gaming hackerrank-certification hackerrank-solutions java laptop problem-solving python python-shape python3 reverse shape solution sql string test

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HackerRank Certification Question

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### Python average function



```python

import math

import os

import random

import re

import sys



def avg(*nums):

    return sum(nums)/len(nums)



if __name__ == '__main__':

```



### Python Reverse Word and Swap Cases



```python

#!/bin/python



import math

import os

import random

import re

import sys



#

# Complete the 'reverse_words_order_and_swap_cases' function below.

#

# The function is expected to return a STRING.

# The function accepts STRING sentence as parameter.

#



def reverse_words_order_and_swap_cases(sentence):

    word_list = sentence.split()

    reversed_list = word_list[:: -1]

    reversed_sentence = " ".join(reversed_list)

    return reversed_sentence.swapcase()



if __name__ == '__main__':

    fptr = open(os.environ['OUTPUT_PATH'], 'w')



    sentence = raw_input()



    result = reverse_words_order_and_swap_cases(sentence)



    fptr.write(result + '\n')



    fptr.close()

```

   

### Python Shape Classes with Area Method 

   

```python

#!/bin/python3



import math

import os

import random

import re

import sys



class Rectangle:

    def __init__(self,breadth,length):

        self.breadth=breadth

        self.length=length

    def area(self):

        return self.breadth*self.length



    pass



class Circle:

    def __init__(self,radius):

        self.radius=radius

    def area(self):

        return math.pi*(self.radius**2)

    pass

if __name__ == '__main__':  

```



## Problem Solving 



### Gaming laptop battery life



```python

def getBattery(events):

    c=50

    for i in events:

        if (i<0):

            c+=i

        else:

            c+=i

            if c>100:

                c=100

        print(c)

    return c

```



### String Anagram



```python

from collections import Counter

def stringAnagram(dictionary, query):

    # Write your code here

    dict = ["".join(sorted(word)) for word in dictionary]

    q = ["".join(sorted(word)) for word in query]

    result = []

    count = Counter(dict)

    for word in q:

        if word in count.keys():

            result.append(count[word])

        else:

            result.append(0)



    return result

```



## Java



### The Adder Class



```java

class Adder extends Calculator{

int add(int a,int b)

{

return a+b;

}

}

```



## Sql



### Student Advisor



```sql

select std.roll_number, std.name 

from student_information std, faculty_information fi 

where std.advisor = fi.employee_id and (fi.gender = 'M' and fi.salary > 15000 or fi.gender = 'F' and fi.salary > 20000) 

```



## Sql Intermediate



### Products without sales



```sql

select sku,product_name from PRODUCT P left join INVOICE_ITEM Ii on Ii.product_id = P.id where invoice_id is NULL order by SKU;

```



### Customer Spending



```sql

select b.customer_name,cast(a.total_price as decimal(10,6))amount from customer b, invoice a where a.customer_id=b.id and a.total_price<=(select (0.25*avg(a.total_price)) FROM invoice a) order by amount desc ;



***or***



select customer_name,to_char(total_price,'fm9999999.900000') from customer c, Invoice i where c.id = i.customer_id and total_price < (select (0.25)*sum(total_price)/count(id) from Invoice);



```