Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:16:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<vec[nod].size(); i++){ ^ user.cpp: In function ‘void verif()’: user.cpp:26:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<ord.size(); i++){ ^ user.cpp:28:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<vec[nod].size(); j++){ ^ user.cpp: In function ‘int main()’: user.cpp:42:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("easygraph.in", "r", stdin); ^ user.cpp:43:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("easygraph.out", "w", stdout); ^ user.cpp:44:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &t); ^ user.cpp:48:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &n, &m); ^ user.cpp:51:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%lld", &v[i]); ^ user.cpp:55:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &x, &y); ^