foo.cc: In function 'void cc(int, int)':
foo.cc:11:19: warning: left operand of comma operator has no effect [-Wunused-value]
   11 |  for(int i=l,j=r;i<=r,j>=l;i++,j--){
      |                  ~^~~
foo.cc:12:22: warning: statement has no effect [-Wunused-value]
   12 |   if(a[i]!=b[j]) flag==1;
      |                  ~~~~^~~

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