foo.c: In function 'main':
foo.c:7:16: warning: implicit declaration of function 'malloc' [-Wimplicit-function-declaration]
    7 |     int *arr = malloc(sizeof(int) * (N+1));
      |                ^~~~~~
foo.c:7:16: warning: incompatible implicit declaration of built-in function 'malloc'
foo.c:2:1: note: include '<stdlib.h>' or provide a declaration of 'malloc'
    1 | #include "stdio.h"
  +++ |+#include <stdlib.h>
    2 | int Insert(int *array, int length, const int b);
foo.c:15:5: warning: implicit declaration of function 'free' [-Wimplicit-function-declaration]
   15 |     free(arr);
      |     ^~~~
foo.c:15:5: warning: incompatible implicit declaration of built-in function 'free'
foo.c:15:5: note: include '<stdlib.h>' or provide a declaration of 'free'
foo.c:6:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    6 |     scanf("%d", &N);
      |     ^~~~~~~~~~~~~~~
foo.c:9:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    9 |         scanf("%d", &arr[i]);
      |         ^~~~~~~~~~~~~~~~~~~~
foo.c:11:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   11 |     scanf("%d", &value);
      |     ^~~~~~~~~~~~~~~~~~~

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