Can you Explain this code's output?

Question

#include <stdio.h>
#include <stdlib.h>
int main(void) {
int i,j;
int **p = (int **)malloc(2 * sizeof(int *));
p[0] = (int *)malloc(2 * sizeof(int));
p[1] = p[0];
for(i = 0; i < 2; i++) {
for(j = 0; j < 2; j++)
{ p[i][j] = i + j;
printf("%d\n",p[0][0]);
}}
printf("\n%d",p[0][0]);
return 0;
}