Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:22:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<AD[x].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:38:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("distante.in","r",stdin); ^ user.cpp:39:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("distante.out","w",stdout); ^ user.cpp: In function ‘int G()’: user.cpp:9:21: warning: ‘c’ is used uninitialized in this function [-Wuninitialized] while(!isdigit(c)) ^