foo.cc: In function 'int main()':
foo.cc:41:5: warning: unused variable 'sum' [-Wunused-variable]
   41 | int sum = 0;
      |     ^~~
foo.cc:16:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   16 | scanf("%d%d", &p, &k);
      | ~~~~~^~~~~~~~~~~~~~~~
foo.cc:18:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   18 | scanf("%s", &s0[i][1]);
      | ~~~~~^~~~~~~~~~~~~~~~~
foo.cc:25:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   25 | scanf("%d", &s);
      | ~~~~~^~~~~~~~~~
foo.cc:27:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   27 | scanf("%s", d[i]);
      | ~~~~~^~~~~~~~~~~~

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