foo.cc: In function 'int main()':
foo.cc:6:9: warning: unused variable 'n' [-Wunused-variable]
    6 |     int n,a[100][100];
      |         ^
foo.cc:7:9: warning: variable 'k' set but not used [-Wunused-but-set-variable]
    7 |     int k,max,min;
      |         ^

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