运行 ID: 33248

Main.cc:23:30: error: ISO C++ forbids declaration of ‘operator<’ with no type [-fpermissive]
  operator < (const node & b) const
                              ^~~~~
Main.cc: In function ‘int main()’:
Main.cc:58:10: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &n, &q);
     ~~~~~^~~~~~~~~~~~~~~~~
Main.cc:62:11: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
      scanf("%d", &w);
      ~~~~~^~~~~~~~~~
Main.cc:70:14: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d", &x, &y); 
         ~~~~~^~~~~~~~~~~~~~~~~