/in/foo.cc: In member function 'BigInt BigInt::operator*(const BigInt&) const':
/in/foo.cc:38:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |         for (int i = 0; i < digits.size(); i++) {
      |                         ~~^~~~~~~~~~~~~~~
/in/foo.cc:39:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |             for (int j = 0; j < other.digits.size(); j++) {
      |                             ~~^~~~~~~~~~~~~~~~~~~~~
/in/foo.cc: In member function 'BigInt BigInt::operator+(const BigInt&) const':
/in/foo.cc:72:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   72 |         for (int i = 0; i < result.size(); i++) {
      |                         ~~^~~~~~~~~~~~~~~
/in/foo.cc:73:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   73 |             if (i < digits.size()) carry += digits[i];
      |                 ~~^~~~~~~~~~~~~~~
/in/foo.cc:74:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   74 |             if (i < other.digits.size()) carry += other.digits[i];
      |                 ~~^~~~~~~~~~~~~~~~~~~~~