Compilare: main.c: In function 'main': main.c:330:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d %d", &nodes, &edges, &source); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:337:9: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &x[i], &y[i]); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~