Compilare: user.cpp: In function ‘int Solve(std::string)’: user.cpp:115:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(Best[node] < splitted.size() && Valid(Tags[node], splitted[Best[node]])) ^ user.cpp:121:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(Best[node] == splitted.size() && Valid(Tags[node], splitted.back())) ^ user.cpp: In function ‘int main()’: user.cpp:129:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("c3selector.in", "r", stdin); ^ user.cpp:130:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("c3selector.out", "w", stdout); ^