Compilare: main.c: In function 'main': main.c:250:9: warning: variable 'nodes_index' set but not used [-Wunused-but-set-variable] int nodes_index[MAX_NODES]; ^~~~~~~~~~~ main.c:249:23: warning: unused variable 'source' [-Wunused-variable] int nodes, edges, source; ^~~~~~ main.c:256:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &nodes, &edges); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:263:9: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &x[i], &y[i]); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~