/in/foo.cc: In function 'int main()':
/in/foo.cc:24:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i = 0; i < b.size(); i++)
~~^~~~~~~~~~
/in/foo.cc:27:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (j = 0; j < a.size(); j++)
~~^~~~~~~~~~
/in/foo.cc:35:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
if (j == a.size())
~~^~~~~~~~~~~
/in/foo.cc:38:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i = 0; i < a.size(); i++)
~~^~~~~~~~~~