Compilare: user.cpp: In function ‘int main()’: user.cpp:16:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d",&n,&m,&k); ^ user.cpp:19:41: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&v[i].m,&v[i].c); ^ user.cpp:36:24: warning: ‘poz’ may be used uninitialized in this function [-Wmaybe-uninitialized] v[poz].viz=true; ^