Compilare: user.cpp: In function ‘int v1(std::string)’: user.cpp:21:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < qw.size(); ++i) { ^ user.cpp: In function ‘int main()’: user.cpp:40:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < ans[i].size() - 1; ++j) { ^ user.cpp: In function ‘void solve()’: user.cpp:53:13: warning: variable ‘qw’ set but not used [-Wunused-but-set-variable] int qw = words.size(); ^ user.cpp: In function ‘void verif()’: user.cpp:115:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < words[n - 1].size(); ++i) { ^