运行 ID: 33247

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:58:12: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result]
     freopen("div.in", "r", stdin);
     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
Main.cc:59:12: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result]
     freopen("div.out", "w", stdout);
     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cc:60:10: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &n, &q);
     ~~~~~^~~~~~~~~~~~~~~~~
Main.cc:64:11: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
      scanf("%d", &w);
      ~~~~~^~~~~~~~~~
Main.cc:72:14: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d", &x, &y); 
         ~~~~~^~~~~~~~~~~~~~~~~