Range update point query

Maintain an array of n integers, all initially 0, supporting two operations given in ops (0-indexed): ["u", l, r, delta] adds delta to every element in the inclusive range [l, r], and ["q", i] returns the current value at index i. Return the answers to the query operations in order. Both operations must run in O(log n). 1 <= n <= 100000, len(ops) <= 100000.