foo.cc: In function 'int main()':
foo.cc:70:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<POINT>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   70 |   while (k < A.size() && A[k].h > B[i].h) {
      |          ~~^~~~~~~~~~

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