Calculate the Nth Term in C - Hacker Rank Solution

Hey coders, today we will be solving Calculate the Nth Term in C Hacker Rank Solution.

Objective

This challenge will help you learn the concept of recursion.

A function that calls itself is known as a recursive function. The C programming language supports recursion. But while using recursion, one needs to be careful to define an exit condition from the function, otherwise it will go into an infinite loop.

To prevent infinite recursion, if. . . else statement (or similar approach) can be used where one branch makes the recursive call and other doesn't.

void recurse() {
    .....
    recurse()  //recursive call
    .....
}
int main() {
    .....
    recurse(); //function call
    .....
}

Task

There is a series, S, where the next term is the sum of previous three terms. Given the first three terms of the series, a, b, c and  respectively, you have to output the nth term of the series using recursion.

Input Format

• The first line contains a single integer, n.
• The next line contains 3 space-separated integers, a, b, and c.

Constraints

• 1 ≤ n ≤ 20
• 1 ≤ a, b, c ≤ 100

Output Format 

Print the nth term of the series, S(n).

Sample Input 0

5
1 2 3

Sample Output 0

11

Explanation 0

Consider the following steps:

1. S(1) = 1
2. S(2) = 2
3. S(3) = 3
4. S(4) = S(3) + S(2) + S(1)
5. S(5) = S(4) + S(3) + S(2)

From steps 1, 2, 3, 4 and , we can say, S(4) = 3 + 2 + 1 = 6 then using the values from step 2, 3, 4, and 5, We get S(5) = 6 + 3 + 2 = 11 Thus, we print 11 as our answer.

Solution - Calculate the Nth Term in C - Hacker Rank Solution 

#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>
//Complete the following function.

int find_nth_term(int n, int a, int b, int c) {
  //Write your code here.
  int i,arr[100];
  arr[1]=a;
  arr[2]=b;
  arr[3]=c;
  for(i=4;i<=n;i++)
  {
      arr[i]=arr[i-1]+arr[i-2]+arr[i-3];
  }
  return arr[n];
}


int main() {
    int n, a, b, c;
  
    scanf("%d %d %d %d", &n, &a, &b, &c);
    int ans = find_nth_term(n, a, b, c);
 
    printf("%d", ans); 
    return 0;
}

Disclaimer: The above Problem (Calculate the Nth Term in C) is generated by Hacker Rank but the Solution is provided by Sloth Coders.

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Sloth Coders 

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