Compilare: user.cpp: In function ‘int main()’: user.cpp:72:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[p].size();j++) ^ user.cpp:57:11: warning: unused variable ‘nr’ [-Wunused-variable] int p=0,nr; ^ user.cpp:25:23: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(c,1000003,f); ^