This has the added bonus of making you aware of how much algorithmic filler there is!
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Modernising phrases
We now maintain an index variable. Previously, the cursor was always at the right-end of the input, since you couldn't use arrow keys to move it left, and new input was always appended at the right-end. Now, we need to keep a separate index which is not necessarily at the end of the input, and when a user enters a character we splice it into the input in the correct location.，更多细节参见咪咕体育直播在线免费看
Checking the literature