foo.c: In function 'main':
foo.c:18:13: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
   18 |         N = (int)malloc(sizeof(int)*(n1 + n2));
      |             ^
foo.c:18:11: warning: assignment to 'int *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
   18 |         N = (int)malloc(sizeof(int)*(n1 + n2));
      |           ^
foo.c:47:37: warning: comparison between pointer and integer
   47 |                         if ((N + j) == temp)
      |                                     ^~

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