foo.cc: In function ‘int main(int, char**)’:
foo.cc:5:20: warning: unused variable ‘b’ [-Wunused-variable]
    5 |         int a,ws=0,b=0,f1,f2,f3,i,j,f4,f5,p,hui=0;
      |                    ^
foo.cc:5:40: warning: variable ‘f5’ set but not used [-Wunused-but-set-variable]
    5 |         int a,ws=0,b=0,f1,f2,f3,i,j,f4,f5,p,hui=0;
      |                                        ^~