Maximize Room Pressure

​ In a row n connected rooms  there are k gas cylinder: the **i-th** gas cylinder is placed in room ri (1≤ri≤n). Two or more gas cylinder cannot be placed in the same room \. Each gas cylinder  generate pressure in **i-th** room is pi \. We can calculate pressure of every room $ 1\leq i\leq n$ using following formula **Max(pi -| ri −i |)** where  $1\leq j\leq k$ .|x-y| denote the absolute diffe