I did it in a different way. What is the real method to find the sum of all numbers till the given number?

Question

N = int(input())
print(int((N*(N+1))/2))

Answer 1

You can use list functions or for loop

1. print(sum(list(range(int(input())+1))))

2.
n = int(input())
sum = 0
for i in range(n+1):
sum += i
i+=1
print(sum)

Answer 2

The way you have already done it is better than using a loop or the sum() function if you're concerned about your time and space complexity. Your use of the Gauss formula is accomplished in constant time O(1) while the use of a loop is linear time O(N).

Answer 3

Thnx i got it.