Compilare: user.c: In function ‘main’: user.c:89:5: warning: implicit declaration of function ‘malloc’ [-Wimplicit-function-declaration] HEAP H = malloc(MAX * sizeof(hnode)); ^ user.c:89:14: warning: incompatible implicit declaration of built-in function ‘malloc’ [enabled by default] HEAP H = malloc(MAX * sizeof(hnode)); ^ user.c:90:15: warning: unused variable ‘j’ [-Wunused-variable] int i, k, j; ^