Wrong Answer
/in/foo.cc: In function 'int main()':
/in/foo.cc:50:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i = 0; i < n_ary.size(); ++i)
~~^~~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:50:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i = 0; i < n_ary.size(); ++i)
~~^~~~~~~~~~~~~~
