problem1146

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Published: May 25, 2021 License: MIT Imports: 0 Imported by: 0

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1146. Snapshot Array

Implement a SnapshotArray that supports the following interface:

  • SnapshotArray(int length) initializes an array-like data structure with the given length. Initially, each element equals 0.
  • void set(index, val) sets the element at the given index to be equal to val.
  • int snap() takes a snapshot of the array and returns the snap_id: the total number of times we called snap() minus 1.
  • int get(index, snap_id) returns the value at the given index, at the time we took the snapshot with the given snap_id

Example 1:

Input: ["SnapshotArray","set","snap","set","get"]
[[3],[0,5],[],[0,6],[0,0]]
Output: [null,null,0,null,5]
Explanation:
SnapshotArray snapshotArr = new SnapshotArray(3); // set the length to be 3
snapshotArr.set(0,5);  // Set array[0] = 5
snapshotArr.snap();  // Take a snapshot, return snap_id = 0
snapshotArr.set(0,6);
snapshotArr.get(0,0);  // Get the value of array[0] with snap_id = 0, return 5

Constraints:

  • 1 <= length <= 50000
  • At most 50000 calls will be made to set, snap, and get.
  • 0 <= index < length
  • 0 <= snap_id < (the total number of times we call snap())
  • 0 <= val <= 10^9

Documentation

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

This section is empty.

Types

type SnapshotArray

type SnapshotArray struct {
	// contains filtered or unexported fields
}

SnapshotArray can snap a array

func Constructor

func Constructor(length int) SnapshotArray

Constructor resturn s a SnapshotArray

func (*SnapshotArray) Get

func (sa *SnapshotArray) Get(index int, snap int) int

Get returns val in the snap

func (*SnapshotArray) Set

func (sa *SnapshotArray) Set(index int, val int)

Set val in index

func (*SnapshotArray) Snap

func (sa *SnapshotArray) Snap() int

Snap make snapshot

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