Compilare: main.c: In function 'main': main.c:41:11: warning: implicit declaration of function 'calloc' [-Wimplicit-function-declaration] 41 | G.A = calloc(G.n+1,sizeof(int*)); | ^~~~~~ main.c:3:1: note: include '<stdlib.h>' or provide a declaration of 'calloc' 2 | #include <string.h> +++ |+#include <stdlib.h> 3 | typedef struct GRAF{ main.c:41:11: warning: incompatible implicit declaration of built-in function 'calloc' [-Wbuiltin-declaration-mismatch] 41 | G.A = calloc(G.n+1,sizeof(int*)); | ^~~~~~ main.c:41:11: note: include '<stdlib.h>' or provide a declaration of 'calloc'