Hii I am recieving the error of SIGMABRT can anyone help with this ??

// { Driver Code Starts
//Initial Template for C  

#include <bits/stdc  .h>

using namespace std;



//User function Template for C  

class Solution {

   int *arr ;

  public:

    int firstElement(int n) 

    {

         arr =new int[n];

         for( int i =0; i<=n;i  )

         {

             arr[i]=-1;

         }

         arr[0]=0;

         arr[1]=1;

         int k = recursion_fibo_series(n , arr); 

         delete []arr;

         return k;

    }

    int recursion_fibo_series(int n ,int arr[])

         {

             if(arr[n]!=-1){

                 return arr[n];

             }

             else

             {

                 arr[n]= recursion_fibo_series(n-1,arr) recursion_fibo_series(n-2,arr);

                 return arr[n];

             }

         }

};



// { Driver Code Starts.

int main() {

    int t;

    cin >> t;


    while (t--) {


        int  n;

        cin >> n ;

        Solution ob;

        cout<<ob.firstElement(n)<<endl;

    }

    return 0;

}

  // } Driver Code Ends

CodePudding user response：

You do

arr =new int[n];

and to initialize the array you do

for( int i =0; i<=n;i  )

That loop will go out of bounds of the array. Since array undexes are zero-based, an array of n elements will have valid indexes from 0 to n - 1. Your loop uses n as an index.

Using out of bounds indexes leads to undefined behavior.

Change loop condition to less than rather than less than or equal:

for( int i = 0; i < n; i  )

Also, the first thing you do in the recursion_fibo_series function is:

if(arr[n]!=-1)

where you again use index n as the index, which is out of bounds.

And you continue to do that inside this function.

CodePudding user response：

This is an out of bounds array access

 arr = new int[n];
 for (int i = 0; i <= n; i  )
 {
     arr[i]=-1;
 }

You want arr = new int[n 1];.