Compilare: user.cpp: In function ‘void df(int, int)’: user.cpp:13:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<g[x].size();++i) ^ user.cpp: In function ‘void cautciclu(int)’: user.cpp:21:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<g[x].size();++i) { ^ user.cpp: In function ‘int main()’: user.cpp:48:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("something.in","r",stdin); ^ user.cpp:49:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("something.out","w",stdout); ^ user.cpp:50:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:52:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^