foo.cc: In function 'int main()':
foo.cc:25:16: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |   for(rll j=0;j<ve[i].size();++j)
      |               ~^~~~~~~~~~~~~
foo.cc:12:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   12 |  scanf("%lld",&n);
      |  ~~~~~^~~~~~~~~~~

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