Compilare: user.c: In function ‘main’: user.c:43:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d%d" ,&n,&m,&k); ^ user.c:46:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d" ,&l[i],&r[i]); ^ user.c:59:20: warning: ‘con’ may be used uninitialized in this function [-Wmaybe-uninitialized] con+=(l[i]-r[i]-1); ^