Compilare: user.cpp: In member function ‘void trie::del(std::string&)’: user.cpp:40:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < b.size() && temp != NULL){ ^ user.cpp:41:36: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if (temp->nr>1 || temp->marker && temp->info != b[b.size() - 1]){ temp2 = temp; k = i; } ^ user.cpp:56:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (tmp2 != NULL && k < b.size()){ ^ user.cpp:58:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k < b.size() - 1)k++; ^ user.cpp: In member function ‘int trie::counts(std::string&)’: user.cpp:71:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < b.size() && temp != NULL){ ^ user.cpp: In member function ‘int trie::cl(std::string&)’: user.cpp:82:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (tmp != NULL && i<b.size()){ ^ user.cpp: In member function ‘void trie::add(std::string&)’: user.cpp:92:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < b.size()){ ^ user.cpp: In function ‘int main()’: user.cpp:120:17: warning: ignoring return value of ‘int system(const char*)’, declared with attribute warn_unused_result [-Wunused-result] system("pause"); ^