Compilare: main.c: In function 'main': main.c:15:13: warning: unused variable 'j' [-Wunused-variable] int n,m,i,j; ^ main.c:18:3: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&n,&m); ^~~~~~~~~~~~~~~~~~~~~~~~ main.c:23:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d",&a[i],&b[i],&d[i]); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~