HackerLand National Bank has a simple policy for warning clients about possiblefraudulent account activity. If the amount spent by a client on a particular day is greaterthan or equal to 2 ×the client's medianspending for the last d days, they send the client a notification about potential fraud. The bank doesn't send the client any notificationsuntil they have at least d prior days of transaction data.Given the value of d and a client's total daily expenditures for a period of n days (where n>d) write amethod which returns the number of times the client will receive a notification over all days.Note: Your algorithm time efficiency should not exceed O(nd) where n is the total number of daily expenditures and d is the number of prior day expenditures used for frauddetection.Your algorithm space complexity should not exceed O(n+d).where n is the total number of daily expenditures and d is the number of prior day expenditures used for frauddetection.Space complexity is defined as the input size + any auxiliary space that is used by the algorithm. The space complexity of a variable that holds a single item is of O(1) but the space complexity of a variable that holds a collection of n items is O(n). Often times we ignore the input size and only compare space complexity of algorithms based on the auxiliary space they use. For example, merge sort space complexity is O(n) because it uses an auxiliary array of size O(n) to store merged subarrays. The textbook does not talk much about space complexity. To learn more about space complexity please read this brief lecture from North Western University and watch this short Youtube video.
HackerLand National Bank has a simple policy for warning clients about possiblefraudulent account activity. If the amount spent by a client on a particular day is greaterthan or equal to 2 ×the client's medianspending for the last d days, they send the client a notification about potential fraud. The bank doesn't send the client any notificationsuntil they have at least d prior days of transaction data.Given the value of d and a client's total daily expenditures for a period of n days (where n>d) write amethod which returns the number of times the client will receive a notification over all days.Note: Your
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