foo.cc: In function 'int main()':
foo.cc:68:7: warning: unused variable 'k' [-Wunused-variable]
   68 |   int k = A.BinSearch(0, n - 1, x);
      |       ^
foo.cc: In member function 'int IntArray::BinSearch(int, int, int)':
foo.cc:41:2: warning: control reaches end of non-void function [-Wreturn-type]
   41 |  }
      |  ^

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