/in/foo.cc: In function 'int main()':
/in/foo.cc:106:18: warning: 'kk' may be used uninitialized in this function [-Wmaybe-uninitialized]
    else ans+=dist(tree[x].d,xf,tree[x].sonf[kk]);
              ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/in/foo.cc:15:23: warning: 'yyyy' may be used uninitialized in this function [-Wmaybe-uninitialized]
  if(x>y)return (2*pi-x+y)*r[d];
                ~~~~~~~^~~
/in/foo.cc:91:37: note: 'yyyy' was declared here
   double ans,xx,yy,xf,yf,xh,yh,xxxx,yyyy,hh;
                                     ^~~~
/in/foo.cc:15:23: warning: 'xxxx' may be used uninitialized in this function [-Wmaybe-uninitialized]
  if(x>y)return (2*pi-x+y)*r[d];
                ~~~~~~~^~~
/in/foo.cc:91:32: note: 'xxxx' was declared here
   double ans,xx,yy,xf,yf,xh,yh,xxxx,yyyy,hh;
                                ^~~~
/in/foo.cc:124:67: warning: 'yyy' may be used uninitialized in this function [-Wmaybe-uninitialized]
   yh=2*pi*(ee[tree[y].d-1]-ee[tree[h].d])-(tree[y].wtcl-tree[yyy].wtcl);
                                                         ~~~~~~~~~~^~~~
/in/foo.cc:123:29: warning: 'xxx' may be used uninitialized in this function [-Wmaybe-uninitialized]
   xh=tree[x].wtcl-tree[xxx].wtcl;
                   ~~~~~~~~~~^~~~