foo.cc: In function 'int main()':
foo.cc:56:12: warning: 'y1' may be used uninitialized in this function [-Wmaybe-uninitialized]
   56 |  int x1,x2,y1,y2;
      |            ^~
foo.cc:56:6: warning: 'x1' may be used uninitialized in this function [-Wmaybe-uninitialized]
   56 |  int x1,x2,y1,y2;
      |      ^~
foo.cc:75:16: warning: 'x2' may be used uninitialized in this function [-Wmaybe-uninitialized]
   75 |  for(int i=x1;i<x2;i++)
      |               ~^~~

正在同步测试数据，请稍后
[Hydro](https://hydro.ac)提供评测服务