Compilare: user.cpp: In function ‘int main()’: user.cpp:86:66: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n;i++) if(d[i]==0) {for(int j=0;j<v[i].v.size();j++) h.push_back(v[i].v[j]);viz[i]=1;} ; ^ user.cpp:104:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i< v[arc.destinatie].v.size(); i++) ^ user.cpp:64:34: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] {fread(buff, 1,buff_size, stdin); ^ user.cpp: In function ‘void read(int&)’: user.cpp:29:96: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] while(!isdigit(buff[pos])) if(++pos == buff_size) fread(buff, 1,buff_size, stdin), pos = 0; ^ user.cpp:34:73: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++pos == buff_size) fread(buff, 1, buff_size, stdin), pos = 0; ^