/in/foo.cc: In function 'long double spfa(int, int, int)':
/in/foo.cc:17:2: warning: this 'while' clause does not guard... [-Wmisleading-indentation]
  while(!q.empty())q.pop(); q.push(st); vis[st]=1,dis[st]=0; int x,y;
  ^~~~~
/in/foo.cc:17:28: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'while'
  while(!q.empty())q.pop(); q.push(st); vis[st]=1,dis[st]=0; int x,y;
                            ^
/in/foo.cc: In function 'void pr(long double)':
/in/foo.cc:40:15: warning: unused variable 'yy' [-Wunused-variable]
  int flag=0,y,yy,ans=0; printf("%d.",y=int(x));x=(x-y)*10;
               ^~