Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:26:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<muchii[nod].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:143:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<ans.size();i++) ^ user.cpp:155:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<ans.size();i++) printf ("%d ",ans[i]); ^ user.cpp: In function ‘int getInt()’: user.cpp:84:16: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ user.cpp: In function ‘int main()’: user.cpp:99:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("johnie.in","r",stdin); ^ user.cpp:100:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("johnie.out","w",stdout); ^ /tmp/ccWtKJjQ.o: In function `getInt()': user.cpp:(.text+0x108): warning: the `gets' function is dangerous and should not be used.