Pseudo Code
Given an array nums,
prefix = [nums[0]]
for (int i = 1; i < nums.length; i++)
prefix.append(nums[i] + prefix[prefix.length - 1])
Given an array nums,
prefix = [nums[0]]
for (int i = 1; i < nums.length; i++)
prefix.append(nums[i] + prefix[prefix.length - 1])
Will the Guru 
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