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