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notes/算法.md
28
notes/算法.md
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@ -354,21 +354,21 @@ public class UF {
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但是 union 操作代价却很高,需要将其中一个连通分量中的所有节点 id 值都修改为另一个节点的 id 值。
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<div align="center"> <img src="../pics//75bb1eca-25a4-4f0b-b8e3-1bbe15c176cf.png" width="350"/> </div><br>
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<div align="center"> <img src="../pics//9764bf07-4840-486c-988f-334acefc3f49.png" width="300"/> </div><br>
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```java
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public int find(int p) {
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return id[p];
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}
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public void union(int p, int q) {
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int pID = find(p);
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int qID = find(q);
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public int find(int p) {
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return id[p];
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}
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public void union(int p, int q) {
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int pID = find(p);
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int qID = find(q);
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if (pID == qID) return;
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for (int i = 0; i < id.length; i++) {
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if (id[i] == pID) id[i] = qID;
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}
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if (pID == qID) return;
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for (int i = 0; i < id.length; i++) {
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if (id[i] == pID) id[i] = qID;
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}
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}
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```
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## quick-union
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@ -377,7 +377,7 @@ public class UF {
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但是 find 操作开销很大,因为同一个连通分量的节点 id 值不同,id 值只是用来指向另一个节点。因此需要一直向上查找操作,直到找到最上层的节点。
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<div align="center"> <img src="../pics//8d905dcf-19de-48ea-bfc2-762093ab5f54.png" width="350"/> </div><br>
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<div align="center"> <img src="../pics//c5043b7e-6efe-4c55-b663-272e1097ed21.png" width="300"/> </div><br>
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```java
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public int find(int p) {
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@ -563,12 +563,12 @@ public class Shell {
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<div align="center"> <img src="../pics//8dfb4cc9-26da-45e7-b820-4576fa1cbb0e.png" width="350"/> </div><br>
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<div align="center"> <img src="../pics//0c55e11c-d3ce-4cd8-b139-028aea6f40e3.png" width="450"/> </div><br>
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### 1. 归并方法
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归并方法将数组中两个已经排序的部分归并成一个。
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<div align="center"> <img src="../pics//0c55e11c-d3ce-4cd8-b139-028aea6f40e3.png" width="450"/> </div><br>
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```java
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public class MergeSort {
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private static Comparable[] aux;
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