foo.cc: In function 'int main()':
foo.cc:64:7: warning: unused variable 'k' [-Wunused-variable]
   64 |   int k = A.BinSearch(0, n - 1, x);
      |       ^
foo.cc: In member function 'int IntArray::BinSearch(int, int, int)':
foo.cc:38:2: warning: control reaches end of non-void function [-Wreturn-type]
   38 |  }
      |  ^

[Hydro](https://hydro.ac)提供评测服务