/in/foo.cc: In function 'int main()':
/in/foo.cc:39:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for (int a = 0; a < v.size() - 1; a++)
                             ~~^~~~~~~~~~~~~~
/in/foo.cc:44:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
                 for (int b = a + 1; b < v.size(); b++)
                                     ~~^~~~~~~~~~
/in/foo.cc:52:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
                     for (int c = 0; c < v.size(); c++)
                                     ~~^~~~~~~~~~
/in/foo.cc:69:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
                     for (int g = 0; g < v1.size(); g++)
                                     ~~^~~~~~~~~~~
/in/foo.cc:89:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for (int i = 1; i <= v.size() / 2; i++)
                             ~~^~~~~~~~~~~~~~~
/in/foo.cc:93:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for (int j = v.size() - 1; j >= (v.size() / 2) + 2; j--)
                                        ~~^~~~~~~~~~~~~~~~~~~~~
/in/foo.cc:98:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for (int g = 0; g < v1.size(); g++)
                             ~~^~~~~~~~~~~
/in/foo.cc:102:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for (int g = 0; g < v2.size(); g++)
                             ~~^~~~~~~~~~~
/in/foo.cc:25:13: warning: unused variable 'll' [-Wunused-variable]
         int ll = v.size();
             ^~