foo.cc: In function 'int main()':
foo.cc:12:20: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   12 |         if(a.size()>m)a.erase(a.begin());
      |            ~~~~~~~~^~

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