Numerical sequence editor
2016-08-23
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You now want to implement a digital sequence for the editor.
The initial time, the sequence is empty.
Shortly after, the following five actions:
I x x after insertion cursor
Digital D Delete before cursor
L to move the cursor to the left, if you have the most left, not moving
R Move the cursor to the right, if you have the most right, not moving
The initial time, the sequence is empty.
Shortly after, the following five actions:
I x x after insertion cursor
Digital D Delete before cursor
L to move the cursor to the left, if you have the most left, not moving
R Move the cursor to the right, if you have the most right, not moving
Q k is assumed that before the cursor sequence {a1, a2, ..., an}, define Si = a1 + a2 + ... + ai, then the
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