foo.cc: In function 'int main()':
foo.cc:57:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<POINT>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   57 |         while(k<A.size()&&A[k].h>B[i].h) {
      |               ~^~~~~~~~~

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