foo.cc: In function 'int FindMax(std::vector<int>)':
foo.cc:10:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |  for(int i = 1; i < v.size(); i++) if(v[i] >= v[MAX]) MAX = i;
      |                 ~~^~~~~~~~~~

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