Compilare: user.c: In function ‘main’: user.c:21:5: warning: implicit declaration of function ‘malloc’ [-Wimplicit-function-declaration] kint* A = malloc(sizeof(kint) * (k * l)); ^ user.c:21:15: warning: incompatible implicit declaration of built-in function ‘malloc’ [enabled by default] kint* A = malloc(sizeof(kint) * (k * l)); ^ user.c:27:9: warning: format ‘%u’ expects argument of type ‘unsigned int *’, but argument 3 has type ‘kint *’ [-Wformat=] fscanf(in, "%u", &A[i]); ^