/in/foo.cc: In function 'void add()':
/in/foo.cc:42:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |                 if (i <= sum.size()) t += sum[sum.size() - i];
      |                     ~~^~~~~~~~~~~~~
/in/foo.cc:43:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |                 if (i <= base.size()) t += base[base.size() - i];
      |                     ~~^~~~~~~~~~~~~~
/in/foo.cc: In function 'bool camp(int, int)':
/in/foo.cc:106:42: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  106 |         for (int i = 0, j = x + blank; i < a.size() && j < n; i++, j++)
      |                                        ~~^~~~~~~~~~
/in/foo.cc: In function 'void output()':
/in/foo.cc:154:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  154 |         for (i = 0; i < sum.size(); i++) cout << sum[i];
      |                     ~~^~~~~~~~~~~~
/in/foo.cc: In function 'bool all00()':
/in/foo.cc:180:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  180 |         for (i = 0; i < ans.size(); i++)
      |                     ~~^~~~~~~~~~~~