Compilare: user.c: In function ‘main’: user.c:47:5: warning: implicit declaration of function ‘malloc’ [-Wimplicit-function-declaration] int *v = (int*) malloc(sizeof(int) * n); ^ user.c:47:21: warning: incompatible implicit declaration of built-in function ‘malloc’ [enabled by default] int *v = (int*) malloc(sizeof(int) * n); ^