/in/foo.cc: In function 'std::vector<int> Mul(std::vector<int>, int)':
/in/foo.cc:8:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    8 |     for (int i = 0; i < a.size() || t; i++) {
      |                     ~~^~~~~~~~~~
/in/foo.cc:9:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 |         if (i < a.size()) t += a[i] * b;
      |             ~~^~~~~~~~~~