foo.cc: In function 'int main()':
foo.cc:7:15: warning: unused variable 's1' [-Wunused-variable]
    7 |     int n,a,i,s1,s2,max,min;
      |               ^~
foo.cc:7:18: warning: unused variable 's2' [-Wunused-variable]
    7 |     int n,a,i,s1,s2,max,min;
      |                  ^~

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