Meesho hacker rank test questions?

Ques 1 - Given a 2-d array of integers of size n^2 data, data[i] represents that the ith data point was inserted into the cache at time data[i][0]. It lives in the cache for data[i][1] time. For an array of q queries , queries[q], find the number of data items in the cache at each time query[i]. [Hard]