/in/foo.cc: In function 'void initData()':
/in/foo.cc:17:16: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
   for(int j=1;j+1<<i-1<=n ;j++){
               ~^~
/in/foo.cc:16:7: warning: unused variable 'pj' [-Wunused-variable]
   int pj=1<<(i-1);
       ^~