foo.cc: In function 'int main()':
foo.cc:5:15: warning: unused variable 'a' [-Wunused-variable]
    5 |         int n,a[100001],x,y;
      |               ^
foo.cc:5:25: warning: unused variable 'x' [-Wunused-variable]
    5 |         int n,a[100001],x,y;
      |                         ^
foo.cc:5:27: warning: unused variable 'y' [-Wunused-variable]
    5 |         int n,a[100001],x,y;
      |                           ^

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