foo.cc: In function 'int main()':
foo.cc:11:20: warning: left operand of comma operator has no effect [-Wunused-value]
   11 |   for(int i=x,j=0;i<x+y,j<x;i++,j++)
      |                   ~^~~~
foo.cc:14:20: warning: left operand of comma operator has no effect [-Wunused-value]
   14 |   for(int i=n,j=0;i<m+n,j<m;i++,j++)
      |                   ~^~~~

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