Missing Number Problem !!!

 PROBLEM 43 : Missing Number 

A Program to find out the missing number from a range of 0-N numbers in a series. 

(Interview Question)

Author - Ajay Zad

Date   - 10/03/2022 

import sys    

n = int(input("Enter the value for n : "))

l = []

for i in range(1,n):

    n1 = int(input("Enter the value less than or equal to 'n' without repeating the values :"))

    l.append(n1)

    

l.sort()

j = 1

for i in range(0,n-1):

    if j != l[i]:

        print("The missing number is ",j)

        sys.exit()

    j = j + 1

    

print("The missing number is ",n)

                                                                    OR

n = int(input("Enter the value for n : "))

l = []

sum = 0

for i in range(1,n):

    n1 = int(input("Enter the value less than or equal to 'n' without repeating the values :"))

    l.append(n1)

    sum = sum + n1

    

sum1 = 0    

for i in range(1,n+1):

    sum1 = sum1 + i

    

print("The missing number is ",(sum1-sum))

The above code is in Python language.

Input :

Enter the value for n : 5

Enter the value less than or equal to 'n' without repeating the values : 3

Enter the value less than or equal to 'n' without repeating the values : 1

Enter the value less than or equal to 'n' without repeating the values : 5

Enter the value less than or equal to 'n' without repeating the values : 2

Output :

The missing number is 4