A shopkeeper needs to maintain daily earnings in a data structure. Sometimes he wants to know money made between day i and day j. This is the only query the shopkeeper makes. Suppose the days are numbered in increasing order irrespective of months or years. Design a data structure for the shopkeeper with the fastest possible functions to add earnings to the data structure and make the query. Which of the following is/are true about this data structure? Soloot ono

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