Freight Conundrum

R2D2 is playing with BB8 with the freight left after the practice matches. There are $N$ pieces of freight on the field and R2D2 associates to each one two values $Id$ and $W$ which represent the $id$ and the $weight$ of a piece of freight. Now BB8 prepared $Q$ queries for R2D2 which are of 3 types: Type 1 : BB8 gives R2D2 a number $pos$ and tells him to switch the freights on the positions $p