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Update 01.Backtracking-Algorithm.md
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Contents/09.Algorithm-Base/04.Backtracking-Algorithm/01.Backtracking-Algorithm.md

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对于上述决策过程,我们也可以用一棵决策树来表示:
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![](https://qcdn.itcharge.cn/images/20220425102048.png)
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![全排列问题的决策树](https://qcdn.itcharge.cn/images/20220425102048.png)
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从全排列的决策树中我们可以看出:
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1. **明确所有选择**:根据数组中每个位置上的元素选与不选两种选择,画出决策树,如下图所示。
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- ![](https://qcdn.itcharge.cn/images/20220425210640.png)
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- ![子集的决策树](https://qcdn.itcharge.cn/images/20220425210640.png)
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2. **明确终止条件**
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1. **明确所有选择**:根据棋盘中当前行的所有列位置上是否选择放置皇后,画出决策树,如下图所示。
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- ![](https://qcdn.itcharge.cn/images/20220426095225.png)
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- ![n 皇后问题的决策树](https://qcdn.itcharge.cn/images/20220426095225.png)
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2. **明确终止条件**
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