Segmentation fault in btree implementation

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Without knowing exactly how this should work I can say that you write outside of the p vector on 

    for (i=0; i < rptr->n; i++)
    {
        lptr->keys[lptr->n + 1 + i] = rptr->keys[i];
        // When you delete key 84, rptr->n is 4 at one point which takes you outside 
        // p[M] 
        lptr->p[lptr->n + 2 + i] = rptr->p[i+1]; 
    }

Valgrind is a good tool to use, and I found this problem by valgrind -v --leak-check=full <your executable>

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