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fix several bugs
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@@ -18,7 +18,7 @@ function backtrack(
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}
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// 遍历所有选择
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choices.forEach((choice, i) => {
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// 剪枝:不允许重复选择元素 且 不允许重复选择相等元素
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// 剪枝:不允许重复选择元素
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if (!selected[i]) {
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// 尝试:做出选择,更新状态
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selected[i] = true;
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