Compilare: user.c: In function ‘main’: user.c:48:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &n, &m); ^ user.c:56:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &x, &y); ^ user.c: In function ‘dfs’: user.c:37:12: warning: ‘tata’ may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(out, "%d %d %d\n", last + 1, x + 1, tata + 1); ^