You are given a binary array consists of 0's and 1's , and q queries . q can be large !

in each query you are given a certain range [L , R].

you have to either toggle bits in the given range i.e make 0 = 1 and 1 = 0 .

and on another query you are about to count all 1's in the range of [L,R]. **** The problem gives a feel of segment tree + lazy propogation . but how to do toggling in segment tree .

how should we update the lazy tree !

Any idea !