Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:21:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<V[nod].size();i++) ^ user.cpp: In function ‘int add(int)’: user.cpp:42:9: warning: unused variable ‘rez’ [-Wunused-variable] int rez; ^ user.cpp: In function ‘int main()’: user.cpp:77:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1;i<=E.size();i++) ^ user.cpp:81:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=1;j<=E.size()-(1<<i)+1;j++) ^ user.cpp:64:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("maxdist.in","r",stdin); ^ user.cpp:65:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&q); ^ user.cpp:69:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^ user.cpp:89:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&Q[i]); ^