/in/foo.cc: In function 'int find(int)':
/in/foo.cc:9:8: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   mid=l+r>>1;
       ~^~
/in/foo.cc: In function 'int main()':
/in/foo.cc:29:8: warning: 'ret' may be used uninitialized in this function [-Wmaybe-uninitialized]
    g[i]=find(a[i]);
    ~~~~^~~~~~~~~~~
/in/foo.cc:21:8: warning: 'ret' may be used uninitialized in this function [-Wmaybe-uninitialized]
    f[i]=find(a[i]);
    ~~~~^~~~~~~~~~~