/in/foo.cc: In function 'int main()':
/in/foo.cc:5:14: warning: unused variable 'a' [-Wunused-variable]
  long long n,a,b,i,count=0,len=1,L=0,j=0;
              ^
/in/foo.cc:5:16: warning: unused variable 'b' [-Wunused-variable]
  long long n,a,b,i,count=0,len=1,L=0,j=0;
                ^
/in/foo.cc:5:20: warning: unused variable 'count' [-Wunused-variable]
  long long n,a,b,i,count=0,len=1,L=0,j=0;
                    ^~~~~