Warning: session_start(): open(/var/lib/php/sessions/sess_2frt22moc1quu664a4dn2hfcr8, O_RDWR) failed: No space left on device (28) in /var/www/tb-usercake/models/config.php on line 51

Warning: session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in /var/www/tb-usercake/models/config.php on line 51
static double ptLength(Pt p) { ret sqrt(p.x*p.x+p.y*p.y); }