/in/foo.cc: In function 'int fz(int, int, int)':
/in/foo.cc:7:7: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  mid=l+r>>1;
      ~^~
/in/foo.cc:38:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
/in/foo.cc:8:9: warning: 'i' is used uninitialized in this function [-Wuninitialized]
  while(i<=j)
        ~^~~
/in/foo.cc:8:9: warning: 'j' is used uninitialized in this function [-Wuninitialized]