Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:14:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < edges[root].size(); ++i ) ^ user.cpp: In function ‘int main()’: user.cpp:39:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(curr <= n) ^ user.cpp:25:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "dfs.in", "r", stdin ); ^ user.cpp:26:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "dfs.out", "w", stdout ); ^