Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:31:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<ceva.size(); i++) ^ user.cpp:35:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i + 1 < inapoi.size(); i+=2) ^ user.cpp:46:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i + 1 < dupa.size(); i+=2) ^ user.cpp: In function ‘int main()’: user.cpp:77:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("drumuri.in", "r", stdin); ^ user.cpp:78:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("drumuri.out", "w", stdout); ^ user.cpp:79:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d", &n, &m); ^ user.cpp:88:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d", &x, &y); ^