foo.cc: In function 'int main()':
foo.cc:45:7: warning: unused variable 'min' [-Wunused-variable]
   45 |   int min = b[0];
      |       ^~~
foo.cc:8:30: warning: unused variable 'flag' [-Wunused-variable]
    8 |  int a[7] = {0}, b[7] = {0}, flag[10];
      |                              ^~~~
foo.cc:9:9: warning: unused variable 's' [-Wunused-variable]
    9 |  int n, s = 0;
      |         ^
foo.cc:15:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   15 |   scanf("%s", s0);
      |   ~~~~~^~~~~~~~~~

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