Given an array with n integers, check if it could become non-decreasing by modifying at most 1 element.
We define an array is non-decreasing if array[i] <= array[i + 1] holds for every i (1 <= i < n).
Explanation: You could modify the first 4 to 1 to get a non-decreasing array.
Explanation: You can't get a non-decreasing array by modify at most one element.
p.s. The n belongs to [1, 10000]