Compilare: user.cpp: In function ‘int main()’: user.cpp:44:17: warning: unused variable ‘ok’ [-Wunused-variable] int n,t,i,s,ok; ^ user.cpp:45:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&n,&t); ^ user.cpp:47:59: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&v[i].second.first,&v[i].first); ^