Compilare: user.cpp: In function ‘void add(int)’: user.cpp:26:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[k].size()&&ok==0;i++) ^ user.cpp: In function ‘int cauta(int)’: user.cpp:57:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[k].size();i++) ^ user.cpp: In function ‘void dfs(int)’: user.cpp:66:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<g[k].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:86:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arbore3.in","r",stdin); ^ user.cpp:87:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arbore3.out","w",stdout); ^ user.cpp:88:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&s); ^ user.cpp:92:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&val[i]); ^