foo.cc: In function 'int main()':
foo.cc:5:14: warning: unused variable 'g' [-Wunused-variable]
    5 |  int m,n,r,x,g,a[1000],a1=0,b[1000],b1=0;
      |              ^
foo.cc:5:16: warning: unused variable 'a' [-Wunused-variable]
    5 |  int m,n,r,x,g,a[1000],a1=0,b[1000],b1=0;
      |                ^
foo.cc:5:24: warning: unused variable 'a1' [-Wunused-variable]
    5 |  int m,n,r,x,g,a[1000],a1=0,b[1000],b1=0;
      |                        ^~
foo.cc:5:29: warning: unused variable 'b' [-Wunused-variable]
    5 |  int m,n,r,x,g,a[1000],a1=0,b[1000],b1=0;
      |                             ^
foo.cc:5:37: warning: unused variable 'b1' [-Wunused-variable]
    5 |  int m,n,r,x,g,a[1000],a1=0,b[1000],b1=0;
      |                                     ^~

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