chirag-shinde

def selection_sort(arr):
    for i in range(len(arr)):
        min_element_index = i
        for j in range(i + 1, len(arr)):
            if arr[j] < arr[min_element_index]:
                min_element_index = j
        arr[i], arr[min_element_index] = arr[min_element_index], arr[i]

chirag-shinde

def quick_sort(arr,start, end):
    if start < end:
        pivot = partition(arr, start, end)
        quick_sort(arr, start, pivot - 1)
        quick_sort(arr, pivot + 1, end)

def partition(arr, start, end):
    element = arr[start]
    i = start
    for j in range(start + 1, end):

chirag-shinde

def merge_sort(arr):
    if len(arr) > 1:
        mid = len(arr) // 2
        left = arr[:mid]
        right = arr[mid:]
        merge_sort(left)
        merge_sort(right)
        merge(arr,left,right)

def merge(arr, left, right):

chirag-shinde

def insertion_sort(list: [int]) -> [int]:
    for i in range(1, len(list)):
        element = list[i]
        j = i - 1
        while j >= 0 and element < list[j]:
            list[j + 1] = list[j]
            j -= 1
        list[j + 1] = element
    return list

chirag-shinde

class Solution:
    def sum_of_squares(self, n: int) -> int:
        total = 0
        while n > 0:
            total += (n % 10) ** 2
            n = int(n / 10)
        return total
    
    def isHappy(self, n: int) -> bool:
        fast = self.sum_of_squares(n)

chirag-shinde

class Solution:
    def sum_of_squares(self, n: int) -> int:
        total = 0
        while n > 0:
            total += (n % 10) ** 2
            n = int(n / 10)
        return total
    
    def isHappy(self, n: int) -> bool:
        repeat_numbers = set()

chirag-shinde

class Solution:
    def singleNumber(self, nums: List[int]) -> int:
        nums_set = set()
        for num in nums:
            if num in nums_set:
                nums_set.remove(num)
            else:
                nums_set.add(num)
        return nums_set.pop()

chirag-shinde

class Solution:
    def singleNumber(self, nums: List[int]) -> int:
        return reduce( lambda x, y: x ^ y, nums)

chirag-shinde

<!-- MongoDB has a command named mongoimport which can be used to directly upload a CSV file into a particular collection of
a database with the first line of the csv as the keys and the following rest of the csv as the values for the respective keys

The format of mongoimport is as folllows

"mongoimport --db database_name --collection collection_name --file csv_file_name --type csv"

now we can use variables to store our database and collection's name.

we upload the file to get the filename and it's path and then simple substitute the database_name and collection_name etc

chirag-shinde

<?php
//Your Database Connection include file here.
//This Entire PHP part can be placed in a seperate action file

            //Upload File
            if (isset($_POST['submit'])) {
                //Upload Directory path.
                $uploaddir = 'uploads/';
                //FilePath with File name.
                $uploadfile = $uploaddir . basename($_FILES["filename"]["name"]);