Compilare: user.c: In function ‘dfs’: user.c:12:12: warning: assignment makes pointer from integer without a cast [-Wint-conversion] for (p = v[n]; p != NULL; p = p ->urm) { ^ user.c: In function ‘main’: user.c:29:16: warning: assignment makes pointer from integer without a cast [-Wint-conversion] p->urm = v[a]; ^ user.c:30:14: warning: assignment makes integer from pointer without a cast [-Wint-conversion] v[a] = p; ^ user.c:33:16: warning: assignment makes pointer from integer without a cast [-Wint-conversion] p->urm = v[b]; ^ user.c:34:14: warning: assignment makes integer from pointer without a cast [-Wint-conversion] v[b] = p; ^ user.c:22:5: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &n, &m); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ user.c:25:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &a, &b); ^~~~~~~~~~~~~~~~~~~~~~~~~~~