/in/foo.cc: In function 'int main()':
/in/foo.cc:5:22: warning: variable 'b' set but not used [-Wunused-but-set-variable]
  long long a[100010],b[100010];
                      ^
/in/foo.cc:6:10: warning: unused variable 'l' [-Wunused-variable]
  int N,Q,l,r;
          ^
/in/foo.cc:6:12: warning: unused variable 'r' [-Wunused-variable]
  int N,Q,l,r;
            ^