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Deven
41 lines
1.0 KiB
Python
41 lines
1.0 KiB
Python
class SnapshotArray:
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def __init__(self, length: int):
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self.data = [0] * length
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self.snapshotChanges = [[] for i in range(length)]
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self.snapId = 0
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def set(self, index: int, val: int) -> None:
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self.data[index] = val
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changes = self.snapshotChanges[index]
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if len(changes) > 0 and changes[-1][0] == self.snapId:
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changes[-1][1] = val
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else:
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self.snapshotChanges[index].append([self.snapId, val])
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def snap(self) -> int:
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self.snapId += 1
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return self.snapId - 1
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def get(self, index: int, snap_id: int) -> int:
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changes = self.snapshotChanges[index]
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insert_index = bisect.bisect(changes, snap_id, key=lambda c : c[0])
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if insert_index == 0:
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return 0
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return changes[insert_index - 1][1]
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# Your SnapshotArray object will be instantiated and called as such:
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# obj = SnapshotArray(length)
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# obj.set(index,val)
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# param_2 = obj.snap()
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# param_3 = obj.get(index,snap_id) |