foo.cc: In function 'int main()':
foo.cc:8:11: warning: right operand of comma operator has no effect [-Wunused-value]
    8 |  cin>>n,x1;
      |           ^
foo.cc:5:17: warning: variable 'flag' set but not used [-Wunused-but-set-variable]
    5 |  int n,x1,max=0,flag,i;
      |                 ^~~~

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