/in/foo.cc: In function 'int main()':
/in/foo.cc:6:38: warning: unused variable 'w2' [-Wunused-variable]
  char ch;int a[100007],i=1,w1=0,l1=0,w2=0,l2=0;
                                      ^~
/in/foo.cc:6:43: warning: unused variable 'l2' [-Wunused-variable]
  char ch;int a[100007],i=1,w1=0,l1=0,w2=0,l2=0;
                                           ^~