foo.cc: In function 'std::vector<int> Add(const std::vector<int>&, const std::vector<int>&)':
foo.cc:8:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    8 |     while (i < num1.size() || j < num2.size() || carry > 0) {
      |            ~~^~~~~~~~~~~~~
foo.cc:8:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    8 |     while (i < num1.size() || j < num2.size() || carry > 0) {
      |                               ~~^~~~~~~~~~~~~
foo.cc:10:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |         if (i < num1.size()) {
      |             ~~^~~~~~~~~~~~~
foo.cc:14:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |         if (j < num2.size()) {
      |             ~~^~~~~~~~~~~~~
foo.cc: In function 'std::vector<int> Mul(const std::vector<int>&, int)':
foo.cc:30:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |     for (int i = 0; i < num.size(); i++) {
      |                     ~~^~~~~~~~~~~~

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