In file included from /in/driver/driver.cpp:1:0:
/in/ex2.h: In function 'int frequency(User, std::__cxx11::string)':
/in/ex2.h:63:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int j = 0; j <= user.blog_list->titles[i].size()-word.size(); j = j + word.size()){
                         ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/in/ex2.h:64:57: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             if (user.blog_list->titles[i].find(word, j) == -1){
                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~
/in/ex2.h:70:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int k = 0; k <= user.blog_list->contents[i].size()-word.size(); k = k + word.size()){
                         ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/in/ex2.h:71:59: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             if (user.blog_list->contents[i].find(word, k) == -1){
                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~