/in/foo.cc: In function 'int main()':
/in/foo.cc:143:27: 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:16:26: warning: 'yyyy' may be used uninitialized in this function [-Wmaybe-uninitialized]
     if(x>y)return (2*pi-x+y)*r[d];
                   ~~~~~~~^~~
/in/foo.cc:128:43: note: 'yyyy' was declared here
         double ans,xx,yy,xf,yf,xh,yh,xxxx,yyyy,hh;
                                           ^~~~
/in/foo.cc:16:26: warning: 'xxxx' may be used uninitialized in this function [-Wmaybe-uninitialized]
     if(x>y)return (2*pi-x+y)*r[d];
                   ~~~~~~~^~~
/in/foo.cc:128:38: note: 'xxxx' was declared here
         double ans,xx,yy,xf,yf,xh,yh,xxxx,yyyy,hh;
                                      ^~~~
/in/foo.cc:164:73: 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:163:35: warning: 'xxx' may be used uninitialized in this function [-Wmaybe-uninitialized]
         xh=tree[x].wtcl-tree[xxx].wtcl;
                         ~~~~~~~~~~^~~~