Compilare: user.cpp: In function ‘int main()’: user.cpp:19:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j < s[i].size() && j < s[i - 1].size()){ ~~^~~~~~~~~~~~~ user.cpp:19:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j < s[i].size() && j < s[i - 1].size()){ ~~^~~~~~~~~~~~~~~~~ user.cpp:9:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dictree.out", "w", stdout); ^