HackerRank Calculate the Nth term solution in c

YASH PAL, 20 July 202416 January 2026

In this HackerRank Calculate the Nth term problem solution we are going to learn about the concept of recursion. in this problem, we have a series of numbers where the next term is the sum of the previous three terms. so we need to print the sum of the series on the output screen.

Calculate the nth term solution

HackerRank Calculate the Nth term solution in c

#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) {
    if(n == 1)
        return a;
    else if (n == 2)
        return b;
    else if (n == 3)
        return c;
    
    return find_nth_term(n-1,a,b,c)+find_nth_term(n-2,a,b,c)+find_nth_term(n-3,a,b,c);
    
}

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;
}

#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) {
    if(n == 1)
        return a;
    else if (n == 2)
        return b;
    else if (n == 3)
        return c;
    
    return find_nth_term(n-1,a,b,c)+find_nth_term(n-2,a,b,c)+find_nth_term(n-3,a,b,c);
    
}

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;
}

Second 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 tmp=0;
    if(n==1){
        return a;
    }
    else if(n==2){
        return b;
    }
    else if(n==3){
        return c;
    }
    tmp=c;
    c = find_nth_term(n-1,a,b,c);
    c += find_nth_term(n-2,a,b,c);
    c += find_nth_term(n-3,a,b,c);
    return find_nth_term(n--,c,tmp,b);

}

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;
}

#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 tmp=0;
    if(n==1){
        return a;
    }
    else if(n==2){
        return b;
    }
    else if(n==3){
        return c;
    }
    tmp=c;
    c = find_nth_term(n-1,a,b,c);
    c += find_nth_term(n-2,a,b,c);
    c += find_nth_term(n-3,a,b,c);
    return find_nth_term(n--,c,tmp,b);

}

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;
}

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