update at 2021-12-28 20:33:27 by ehlxr

budd-common/src/main/java/io/github/ehlxr/algorithm/sort/QuickSort.java

@@ -0,0 +1,77 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright © 2021 xrv <xrg@live.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package io.github.ehlxr.algorithm.sort;
+
+import java.util.Arrays;
+
+/**
+ * @author ehlxr
+ * @since 2021-12-28 19:57.
+ */
+public class QuickSort {
+    public static void main(String[] args) {
+        int[] arrs = new int[]{3, 2, 5, 7, 1, 9};
+        sort(arrs, 0, arrs.length - 1);
+
+        System.out.println(Arrays.toString(args));
+    }
+
+    public static void sort(int[] arrs, int p, int r) {
+        if (p >= r) {
+            return;
+        }
+
+        int k = partition(arrs, p, r);
+
+        sort(arrs, p, k - 1);
+        sort(arrs, k + 1, r);
+    }
+
+    public static int partition(int[] arrs, int p, int r) {
+        int i = p;
+        int pivot = arrs[r];
+        for (int j = p; j < r; j++) {
+            if (arrs[j] < pivot) {
+                if (j != i) {
+                    swap(arrs, i, j);
+                }
+                i++;
+            }
+        }
+
+        swap(arrs, i, r);
+        System.out.println("i=" + i);
+
+        return i;
+    }
+
+    public static void swap(int[] arrs, int i, int j) {
+        int temp = arrs[i];
+        arrs[i] = arrs[j];
+        arrs[j] = temp;
+    }
+
+
+}