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given an array of integers, without reordering, determine the maximum difference between any element and prior smaller element. If there is never a lower prior element, return -1. example arr = [5,3,6,7,4] there are no earlier elements than arr[0]. there is no earlier reading with a value lower than arr[1]. there are two lower earlier readings with a value lower than arr[2]=6: • arr[2] - arr[1] = 6 - 3 = 3 • arr[2] - arr[0] = 6 - 5 = 1 there are three lower earlier readings with a lower value than arr[3]=7: • arr[3] - arr[2] = 7 - 6 = 1 • arr[3] - arr[1] = 7 - 3 =4 • arr[3] - arr[0] = 7 - 5 =2 there is one lower earlier reading with a lower value than arr[4]=4: • arr[4] - arr[1] = 4 - 3 = 1 the maximum trailing record is arr[3] - arr[1] = 4
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