【排序算法】No.2 归并排序

时间复杂度：O(NlogN)  空间复杂度：O(N)

    public void merge(int[] array, int left, int mid, int right) {
        int length = right - left + 1;
        int[] tmp = new int[length];
        int i = left, j = mid + 1, index = 0;
        while (i <= mid && j <= right) {
            if (array[i] <= array[j]) {
                tmp[index++] = array[i++];
            } else {
                tmp[index++] = array[j++];
            }
        }

        while (i <= mid) {
            tmp[index++] = array[i++];
        }
        while (j <= right) {
            tmp[index++] = array[j++];
        }
        for (i = 0; i < length; i++) {
            array[left++] = tmp[i];
        }
    }
    public void mergeSort(int[] array, int left, int right) {
        if (left >= right) {
            return;
        }
        int mid = (left + right) / 2;
        mergeSort(array, left, mid);
        mergeSort(array, mid + 1, right);
        merge(array, left, mid, right);
    }

 

来源：CSDN

作者：是逍遥呀呀呀呀

链接：https://blog.csdn.net/weixin_38092213/article/details/103653628