Compilare: user.cpp: In function ‘int main()’: user.cpp:30:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < w.size(); i++) ^ user.cpp:33:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < 60 && j + i < w.size(); j++) ^ user.cpp:43:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < s[i].size(); j++) ^ user.cpp:46:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = 0; k < 60 && k + j < s[i].size(); k++) ^ user.cpp:19:6: warning: variable ‘ok’ set but not used [-Wunused-but-set-variable] int ok = 0; ^