Compilare: main.c:30:1: warning: return type defaults to 'int' [-Wimplicit-int] main(){ ^~~~ main.c: In function 'main': main.c:32:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%lld%lld", &n, &m); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:35:9: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%lld%lld", &b[i], &a[i]); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~