O(nlogn) algo for each postion in paragraph store the frequency of the given words(from start point to this point) .
now in resultant array you need to two indexes that have >=1 value in the difference of the frequency of two points. eg hello hello are you hello ,you hello hello are you 1 2 2 2 (freq of hello) 0 0 0 1 (freq of you) for index 0 we get index 3 for index 1 we get index 3 for index 2 we have no value for index 3 we have no vale ans=3-1+1=3 NOTE:INDEX represents word no. --
