foo.cc: In function ‘int main()’:
foo.cc:49:16: warning: ‘xb’ may be used uninitialized [-Wmaybe-uninitialized]
   49 |         bj1[xb]=0;
      |         ~~~~~~~^~
foo.cc:35:19: note: ‘xb’ was declared here
   35 |     int hh=k,ll=l,xb,first1,first2,js1=0,js2=0;
      |                   ^~