Compilare: user.c: In function ‘initialise_heap’: user.c:98:2: warning: implicit declaration of function ‘malloc’ [-Wimplicit-function-declaration] *root = (node_heap*)malloc(sizeof(node_heap)); ^ user.c:98:22: warning: incompatible implicit declaration of built-in function ‘malloc’ [enabled by default] *root = (node_heap*)malloc(sizeof(node_heap)); ^ user.c: In function ‘add_to_heap’: user.c:112:44: warning: incompatible implicit declaration of built-in function ‘malloc’ [enabled by default] node_heap *temp_node_heap = (node_heap*)malloc(sizeof(node_heap)); ^ user.c:127:44: warning: incompatible implicit declaration of built-in function ‘malloc’ [enabled by default] node_heap *temp_node_heap = (node_heap*)malloc(sizeof(node_heap)); ^ user.c: In function ‘add_to_list’: user.c:159:29: warning: incompatible implicit declaration of built-in function ‘malloc’ [enabled by default] node_list *p = (node_list*)malloc(sizeof(node_list)); ^ user.c: In function ‘remove_first_list’: user.c:170:3: warning: implicit declaration of function ‘free’ [-Wimplicit-function-declaration] free(p); ^ user.c:170:3: warning: incompatible implicit declaration of built-in function ‘free’ [enabled by default] user.c: In function ‘DFS’: user.c:229:3: warning: passing argument 1 of ‘remove_first_list’ from incompatible pointer type [enabled by default] remove_first_list(V[t]); ^ user.c:164:6: note: expected ‘struct node_list **’ but argument is of type ‘struct node_list *’ void remove_first_list(node_list **node) ^ user.c: In function ‘BFS’: user.c:235:21: warning: incompatible implicit declaration of built-in function ‘malloc’ [enabled by default] int *queue = (int*)malloc(sizeof(int) * size); ^ user.c:249:4: warning: passing argument 1 of ‘get_first_elem_list’ from incompatible pointer type [enabled by default] el = get_first_elem_list(V[node]); ^ user.c:174:5: note: expected ‘struct node_list **’ but argument is of type ‘struct node_list *’ int get_first_elem_list(node_list **node) ^ user.c:257:5: warning: passing argument 1 of ‘remove_first_list’ from incompatible pointer type [enabled by default] remove_first_list(V[node]); ^ user.c:164:6: note: expected ‘struct node_list **’ but argument is of type ‘struct node_list *’ void remove_first_list(node_list **node) ^ user.c:264:2: warning: incompatible implicit declaration of built-in function ‘free’ [enabled by default] free(queue); ^ user.c: In function ‘main’: