/in/foo.cc: In function 'int pd(std::__cxx11::string)':
/in/foo.cc:16:12: warning: 'o' may be used uninitialized in this function [-Wmaybe-uninitialized]
     return o;
            ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:42:32: warning: 'o' may be used uninitialized in this function [-Wmaybe-uninitialized]
         a[pd(xing)].qian+=(n1-s);
                                ^
/in/foo.cc:39:43: warning: 'o' may be used uninitialized in this function [-Wmaybe-uninitialized]
             a[pd(xing1)].qian+=(int)(n1/m1);
                                           ^
/in/foo.cc:32:27: warning: 'o' may be used uninitialized in this function [-Wmaybe-uninitialized]
         a[pd(xing)].qian-=n1;
                           ^~