foo.cc: In function 'int main()':
foo.cc:50:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d",&n,&m,&t);
  ~~~~~^~~~~~~~~~~~~~~~~~~
foo.cc:54:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&r[i]),ee[i]=ee[i-1]+r[i];
   ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~
foo.cc:57:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lf%lf%d%d",&tree[i].x,&tree[i].y,&tree[i].d,&tree[i].fa[0]);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:125:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%lf%d%lf",&x,&xf,&y,&yf);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:135:8: warning: 'kk' may be used uninitialized in this function [-Wmaybe-uninitialized]
    int kk;
        ^~
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];
                ~~~~~~~^~~
foo.cc:124:37: note: 'yyyy' was declared here
   double ans,xx,yy,xf,yf,xh,yh,xxxx,yyyy,hh;
                                     ^~~~
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];
                ~~~~~~~^~~
foo.cc:124:32: note: 'xxxx' was declared here
   double ans,xx,yy,xf,yf,xh,yh,xxxx,yyyy,hh;
                                ^~~~
foo.cc:160:67: 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);
                                                         ~~~~~~~~~~^~~~
foo.cc:159:29: warning: 'xxx' may be used uninitialized in this function [-Wmaybe-uninitialized]
   xh=tree[x].wtcl-tree[xxx].wtcl;
                   ~~~~~~~~~~^~~~

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