3 aircraft and 4 cabin layouts, from the 777-200LR to the 777-300ER. Pick one for its seat map, the best seats and the seats to avoid.
There are seat maps for 3 PIA aircraft here: the Boeing 777-200ER, the Boeing 777-200LR and the Boeing 777-300ER.
The Boeing 777-300ER, with 393 seats: 35 Executive Economy and 358 Economy in its main layout.