Compilare: user.cpp: In constructor ‘DynConn::DynConn(int, int)’: user.cpp:9:29: warning: ‘DynConn::sz’ will be initialized after [-Wreorder] vector<int> link, rank, sz; ^~ user.cpp:8:36: warning: ‘std::vector<std::vector<std::pair<int, int> > > DynConn::edges’ [-Wreorder] vector<vector<pair<int, int>>> edges; ^~~~~ user.cpp:12:5: warning: when initialized here [-Wreorder] DynConn(int n, int k) : link(n, -1), rank(n, 0), sz(n, 1), edges(4 * n), k(k) {} ^~~~~~~ user.cpp: In function ‘int main()’: user.cpp:84:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nespus.in", "r", stdin); ^ user.cpp:85:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nespus.out", "w", stdout); ^