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Write a program to find out the sum of 1 to n number which take minimum time to solve it.

Ravi Vishwakarma 2585 27 Jan 2023

I am write procedure for write code sum of 1 to n numbers.
but It take more second to solve it.
like var a = 1 , var n = 12345678965487512 ,

var sum = 12345678965487513 ,

Ask by Ravi Vishwakarma

Updated 27 Jan 2023

3 Answers

Sanjay Goenka 06 Mar 2023 Accepted Answer

I am writing a program in JavaScript language.

function sum_of_numbers(n){
   return n * (n + 1) / 2;
}

console.log(sum_of_numbers(100));

Output:

5050

Amrita Bhattacharjee 08 Feb 2023

The program to find out sum of 1 to n number in python will be the following:

def sum_of_numbers(n):
   return n * (n + 1) // 2
print(sum_of_numbers(100))

Rahul Roi 02 Feb 2023

#include <stdio.h>
int main(void) {
   int N, sum = 0, i = 1;
   scanf('%d', &N);
   sum = N*(N+1)/2;
   printf('Sum of first %d natural numbers is: %d', N, sum);
   return 0;
}

Output →

Input : 5
Output : Sum of first 5 natural numbers is: 15

This program take O(1) time.

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