Compilare: main.c: In function 'main': main.c:149:15: warning: unused variable 'nodes_index' [-Wunused-variable] int n, m, i, nodes_index[NMAX], x, y; ^~~~~~~~~~~ main.c:151:2: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &n, &m); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:155:9: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &x, &y); ^~~~~~~~~~~~~~~~~~~~~~~~~~~