Sum of Series DSA Problem

Write a program to find the sum of the given series 1+2+3+ . . . . . .(N terms)

Example 1:

Input:
N = 1
Output: 1
Explanation: For n = 1, sum will be 1.

Example 2:

Input:
N = 5
Output: 15
Explanation: For n = 5, sum will be 15.

1 + 2 + 3 + 4 + 5 = 15.

Ans:

class Solution {

public static long seriesSum(int n) {

// code

if(n == 1){

return 1;

}

long s = 0;

for(int i = 1; i <= n; i++){

s = s+i;

} return s;

}

Note: 1) time complexity will be O(N), because using 1 loop

2) we can start i from 0th index also

Using recursion:

class Solution { public static long seriesSum(int n) { // Base Case if (n == 1) { return 1; } // Recursive Case: Sum of series up to (n - 1) + n return seriesSum(n - 1) + n; } }

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