foo.cc: In function 'int main()':
foo.cc:9:11: warning: unused variable 's' [-Wunused-variable]
    9 |     int n,s;
      |           ^
foo.cc:10:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   10 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
foo.cc:14:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   14 |             scanf("%d",&a[j][i]);
      |             ~~~~~^~~~~~~~~~~~~~~

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Found 5 testcases.
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