Insertion Sort

插入排序 将i元素插入到下标为0~i-1的位置上，逐个比较，如果发现前面的元素比arr[i]大 则将该元素后移 否则将i元素放入到空位置上

package whale.simpleAlgorithm;


/**
 * @Author: WhaleFall541
 * @Date: 2021/4/4 16:08
 */
public class SimpleSort {

    public static void main(String[] args) throws InterruptedException {

        int[] arr = {-1111, 20, -3, -10, 100, -255};

        insertSort(arr);
        StringBuilder sb = new StringBuilder();
        for (int i : arr)
            sb.append(i).append(" ");
        System.out.println("sb = " + sb);

    }

    // 插入排序
    private static void insertSort(int[] arr) {
        for (int i = 1; i < arr.length; i++) {
            // 需要将i插入到前面子序列
            if (arr[i] < arr[i - 1]) {
                int k = arr[i], j;
                // i为要插入的元素,j为i往前的元素
                // 如果arr[j]比k大 则把arr[j]元素往后挪
                // 如果arr[j]比k小则直接插入元素在空位上
                for (j = i - 1; j >= 0 && arr[j] > k; j--)
                    arr[j + 1] = arr[j];
                // 将元素放到比k小的后面
                arr[j + 1] = k;
            }
        }
    }
}

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