Compilare: user.cpp: In function ‘int main()’: user.cpp:11:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d",&u,&n,&o); ^ user.cpp:15:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&o); ^ user.cpp:45:31: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(v[p-1]!=v[p]){ko=0;break;} ^