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‎advanced_algorithm/backtrack.md

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@@ -146,6 +146,8 @@ func permute(_ nums: [Int]) -> [[Int]] {
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> 给定一个可包含重复数字的序列，返回所有不重复的全排列。
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![backtrack_permutations_ii](../images/backtrack_permutations_ii.png)
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```swift
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//https://leetcode-cn.com/problems/permutations-ii/solution/swift-47-quan-pai-lie-iipai-xu-hou-hui-su-you-hua-/
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//执行用时：64 ms, 在所有 Swift 提交中击败了43.59%的用户

‎images/backtrack_permutations_ii.png

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