Compilare: user.cpp: In constructor ‘SCCWrapper::SCCWrapper(int)’: user.cpp:19:15: warning: ‘SCCWrapper::Viz’ will be initialized after [-Wreorder] vector<bool> Viz; ^ user.cpp:18:22: warning: ‘std::vector<std::vector<int> > SCCWrapper::G’ [-Wreorder] vector<vector<int>> G, G_T; ^ user.cpp:28:2: warning: when initialized here [-Wreorder] SCCWrapper(int n) : n(n), Viz(n), G(n), G_T(n), SCC(n) { ^ In file included from /usr/include/c++/4.8/cassert:43:0, from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:33, from user.cpp:11: user.cpp: In member function ‘void SCCWrapper::Reduce()’: user.cpp:64:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(Stack.size() == n); ^ user.cpp: In function ‘int main()’: user.cpp:84:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ctc.in", "r", stdin); ^ user.cpp:85:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ctc.out", "w", stdout); ^