Compilare: user.cpp: In function ‘int main()’: user.cpp:36:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 1 ; j < crt.size(); ++j) ^ user.cpp:45:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 1 ; j < c.size() - 1 ; ++j) ^ user.cpp:52:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 1 ; j < c.size() ; ++j) ^ user.cpp:67:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k + 1 < cc.size() && (cc[k + 1].second == '*' || cc[k].second == '*')) ^ user.cpp:70:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k + 2 < cc.size() && cc[k + 2].second == '*' && cc[k].second == '*') ^