/in/foo.cc: In function 'int main()':
/in/foo.cc:13:9: error: 'i' was not declared in this scope
     for(i=1;i<=n;i++) cin>>a[i];
         ^
/in/foo.cc:14:9: error: 'i' was not declared in this scope
     for(i=1;i<=m;i++) cin>>b[i];
         ^