diff --git a/src/leetcode/lc315_countSmaller.java b/src/leetcode/lc315_countSmaller.java
index 31f32b0..ce56d40 100644
--- a/src/leetcode/lc315_countSmaller.java
+++ b/src/leetcode/lc315_countSmaller.java
@@ -38,7 +38,7 @@ import java.util.List;
  * @DATE 2020/12/4 6:11 下午
  * @Description
  */
-class Solution {
+class lc315_countSmaller {
     public static  List<Integer> countSmaller(int[] nums) {
         if (nums.length < 1 || nums == null) {
             return null;
@@ -89,7 +89,7 @@ class Main_315{
 
     public static void main(String[] args){
         int[] nums = new int[]{3,7,5,2,6,1};
-        List<Integer> list = Solution.countSmaller(nums);
+        List<Integer> list = lc315_countSmaller.countSmaller(nums);
         System.out.println(list);
 
     }
diff --git a/src/leetcode/lc92_reverseBetween.java b/src/leetcode/lc92_reverseBetween.java
new file mode 100644
index 0000000..cbb289b
--- /dev/null
+++ b/src/leetcode/lc92_reverseBetween.java
@@ -0,0 +1,101 @@
+package leetcode;
+
+
+//反转从位置 m 到 n 的链表。请使用一趟扫描完成反转。
+//
+// 说明:
+//1 ≤ m ≤ n ≤ 链表长度。
+//
+// 示例:
+//
+// 输入: 1->2->3->4->5->NULL, m = 2, n = 4
+//输出: 1->4->3->2->5->NULL
+// Related Topics 链表
+// 👍 594 👎 0
+
+/**
+ * @author Leo
+ * @ClassName lc92_reverseBetween
+ * @DATE 2020/12/7 2:29 下午
+ * @Description
+ */
+//leetcode submit region begin(Prohibit modification and deletion)
+/**
+ * Definition for singly-linked list.
+ * public class ListNode {
+ *     int val;
+ *     ListNode next;
+ *     ListNode(int x) { val = x; }
+ * }
+ */
+class lc92_reverseBetween {
+    public ListNode reverseBetween1(ListNode head, int m, int n) {
+        if (head==null||m == n){
+            return head;
+        }
+        ListNode cur = head;
+        ListNode pre = null;
+        while (cur != null && m > 1) {
+            pre = cur;
+            cur = cur.next;
+            m--;
+            n--;
+        }
+        if (cur==null||cur.next == null){
+            return head;
+        }
+        ListNode tail = cur;
+        ListNode temp = pre;
+        ListNode next = null;
+        while (cur != null && n > 0) {
+            next = cur.next;
+            cur.next = pre;
+            pre = cur;
+            cur = next;
+            n--;
+        }
+        if (temp != null) {
+            temp.next = pre;
+        }else{
+            head = pre;
+        }
+        tail.next = cur;
+        return head;
+    }
+
+
+    public ListNode reverseBetween(ListNode head, int m, int n) {
+        if (head == null || m == n) {
+            return head;
+        }
+        ListNode pre = null;
+        ListNode cur = head;
+        while (cur != null && m > 1) {
+            pre = cur;
+            cur = cur.next;
+            m--;
+            n--;
+        }
+        ListNode preTemp = pre, next = null, tail = cur;
+        while (cur != null && n > 0) {
+            next = cur.next;
+            cur.next = preTemp;
+            preTemp = cur;
+            cur = next;
+        }
+        if (pre != null) {
+            pre.next = cur;
+        }else{
+
+        }
+        tail.next = next;
+
+        return head;
+    }
+
+}
+class ListNode {
+    int val;
+    ListNode next;
+    ListNode(int x) { val = x; }
+}
diff --git a/src/leo/class03_05/CountOfRangeSum.java b/src/leo/class03_05/CountOfRangeSum.java
index e3a1429..1369ad6 100644
--- a/src/leo/class03_05/CountOfRangeSum.java
+++ b/src/leo/class03_05/CountOfRangeSum.java
@@ -362,10 +362,10 @@ class CountOfRangeSum5 {
         while (index <= r) {
             long max = sum[index] - lower;
             long min = sum[index] - upper;
-            while (windowR <= r && sum[windowR] <= max) {
+            while (windowR <= m && sum[windowR] <= max) {
                 windowR++;
             }
-            while (windowL < r && sum[windowL] < min) {
+            while (windowL <=m && sum[windowL] < min) {
                 windowL++;
             }
             index++;
@@ -393,6 +393,69 @@ class CountOfRangeSum5 {
 
 }
 
+
+class CountOfRangeSum6{
+    public static int countRangeSum(int[] arr, int lower, int upper) {
+        if (arr.length == 0 || arr == null) {
+            return 0;
+        }
+        long[] sum = new long[arr.length];
+        sum[0] = arr[0];
+        for (int i = 1; i < arr.length; i++) {
+            sum[i] = sum[i - 1] + arr[i];
+        }
+        return process(sum, 0, arr.length - 1, lower, upper);
+    }
+
+    public static int process(long[] arr, int l, int r, int lower, int upper) {
+        if (l > r) {
+            return 0;
+        }
+        if (l == r) {
+            return arr[l] >= lower && arr[l] <= upper ? 1 : 0;
+        }
+        int m = l + ((r - l) >> 1);
+        return process(arr, l, m, lower, upper) + process(arr, m + 1, r, lower, upper) + merge(arr, l, m, r, lower, upper);
+    }
+
+    public static int merge(long[] arr,int l,int m,int r,int lower,int upper){
+        int windowL = l;
+        int windowR = l;
+        int index = m + 1;
+        int res = 0;
+        while (index <= r) {
+            long max = arr[index] - lower;
+            long min = arr[index] - upper;
+            while (windowR<=m&&arr[windowR] <= max) {
+                windowR++;
+            }
+            while (windowL<=m&&arr[windowL] < min) {
+                windowL++;
+            }
+            index++;
+            res += windowR - windowL;
+        }
+        long[] help = new long[r - l + 1];
+        int i = 0;
+        int p1 = l;
+        int p2 = m + 1;
+        while (p1 <= m && p2 <= r) {
+            help[i++] = arr[p1] <= arr[p2] ? arr[p1++] : arr[p2++];
+        }
+        while(p1<=m){
+            help[i++] = arr[p1++];
+        }
+        while(p2<=r){
+            help[i++] = arr[p2++];
+        }
+        for (i = 0; i < help.length; i++) {
+            arr[l + i] = help[i];
+        }
+        return res;
+
+    }
+}
+
 class MainTest{
 
     public static int countRangeSum(int[] nums, int lower, int upper) {
@@ -422,7 +485,7 @@ class MainTest{
             do {
                 upper = (int) ((range * Math.random() + 1) - (range * Math.random() + 1));
             } while (upper <= lower);
-            int sumCount = CountOfRangeSum4.countRangeSum(arr, lower, upper);
+            int sumCount = CountOfRangeSum5.countRangeSum(arr, lower, upper);
             int testSumCount = countRangeSum(copyArray, lower, upper);
             if (sumCount != testSumCount) {
                 System.out.println("sumCount :" + sumCount+" testSumCount : "+testSumCount);
diff --git a/src/leo/class03_05/QuickSort1.java b/src/leo/class03_05/QuickSort1.java
index 4a2adc2..465ea85 100644
--- a/src/leo/class03_05/QuickSort1.java
+++ b/src/leo/class03_05/QuickSort1.java
@@ -1,6 +1,7 @@
 package leo.class03_05;
 
 import leo.util.ArrayUtil;
+import sun.jvm.hotspot.debugger.Page;
 
 import java.util.Arrays;
 import java.util.Stack;
@@ -375,7 +376,7 @@ class QuickSort3_4{
         }
         int[] equalArea = partition(arr, l, r);
         process(arr, l, equalArea[0] - 1);
-        process(arr, equalArea[0] + 1, r);
+        process(arr, equalArea[1] + 1, r);
     }
 
     private static int[] partition(int[] arr, int l, int r) {
@@ -409,6 +410,56 @@ class QuickSort3_4{
 
 }
 
+class QuickSort3_5 {
+
+    public static void quickSort(int[] arr) {
+        if (arr.length < 2 || arr == null) {
+            return;
+        }
+        process(arr, 0, arr.length - 1);
+    }
+
+    public static void process(int[] arr, int l, int r) {
+
+        if (l >= r) {
+            return;
+        }
+        int[] equalsArea = partition(arr, l, r);
+        process(arr, l, equalsArea[0] - 1);
+        process(arr, equalsArea[1] + 1, r);
+
+    }
+
+
+    private static int[] partition(int[] arr, int l, int r) {
+        int leftIndex = l - 1;
+        int rightIndex = r;
+        int i = l;
+        while (i < rightIndex) {
+            if (arr[i] == arr[r]) {
+                i++;
+            } else if (arr[i] > arr[r]) {
+                swap(arr, i, --rightIndex);
+
+            } else if (arr[i] < arr[r]) {
+                swap(arr, i++, ++leftIndex);
+            }
+        }
+        swap(arr, r, rightIndex);
+        return new int[]{leftIndex + 1, rightIndex};
+    }
+
+
+    public static void swap(int[] arr, int i, int j) {
+        if (i == j || arr[i] == arr[j]) {
+            return;
+        }
+        arr[i]= arr[i]^arr[j];
+        arr[j]= arr[i]^arr[j];
+        arr[i]= arr[i]^arr[j];
+    }
+}
+
 class QuickSortUnRecursive{
 
     private static class Op {
diff --git a/src/leo/class04_06/HeapSort.java b/src/leo/class04_06/HeapSort.java
index 9cfda81..430ea2c 100644
--- a/src/leo/class04_06/HeapSort.java
+++ b/src/leo/class04_06/HeapSort.java
@@ -1,6 +1,7 @@
 package leo.class04_06;
 
 import leo.util.ArrayUtil;
+import sun.jvm.hotspot.debugger.Page;
 
 import java.util.Arrays;
 
@@ -66,6 +67,46 @@ public class HeapSort {
     }
 
 }
+class HeapSort1{
+
+    public static void heapSort(int[] arr) {
+        if (arr.length < 2 || arr == null) {
+            return;
+        }
+        for (int i = arr.length - 1; i >= 0; i--) {
+            heapify(arr, i, arr.length);
+        }
+        int length = arr.length;
+        while (length > 0) {
+            swap(arr, 0, --length);
+            heapify(arr, 0, length);
+        }
+        heapify(arr, 0, length);
+    }
+
+    public static void heapify(int[] arr, int i, int heapSize) {
+        int left = i << 1 | 1;
+        while (left < heapSize) {
+            int largest = left + 1 < heapSize && arr[left + 1] > arr[left] ? left + 1 : left;
+            largest = arr[largest] > arr[i] ? largest : i;
+            if (largest == i) {
+                return;
+            }
+            swap(arr, largest, i);
+            i = largest;
+            left = i << 1 | 1;
+        }
+    }
+
+    public static void swap(int[] arr, int i, int j) {
+        if (i == j || arr[i] == arr[j]) {
+            return;
+        }
+        arr[i] = arr[i] ^ arr[j];
+        arr[j] = arr[i] ^ arr[j];
+        arr[i] = arr[i] ^ arr[j];
+    }
+}
 
 
 
@@ -83,7 +124,7 @@ class MainHeapSort {
             int[] arr = ArrayUtil.randomArray(sizeMax, range);
             int[] copyArray = ArrayUtil.copyArray(arr);
             Arrays.sort(copyArray);
-            HeapSort.heapSort(arr);
+            HeapSort1.heapSort(arr);
             if (!ArrayUtil.isEqual(arr, copyArray)) {
                 ArrayUtil.printArr(arr);
                 ArrayUtil.printArr(copyArray);
diff --git a/src/leo/class04_06/MyMaxHeap.java b/src/leo/class04_06/MyMaxHeap.java
index fcc9390..d837cc1 100644
--- a/src/leo/class04_06/MyMaxHeap.java
+++ b/src/leo/class04_06/MyMaxHeap.java
@@ -1,6 +1,8 @@
 package leo.class04_06;
 
 import java.util.PriorityQueue;
+import java.util.concurrent.ForkJoinPool;
+import java.util.function.IntPredicate;
 
 /**
  * @author Leo
@@ -298,6 +300,136 @@ class MyMaxHeap3 {
 
 }
 
+class MyMaxHeap4{
+
+    int size;
+    int[] arr;
+    final int limit;
+
+    public MyMaxHeap4(int limit) {
+        this.limit = limit;
+        this.size = 0;
+        arr = new int[limit];
+    }
+
+    public boolean isEmpty() {
+        return size == 0;
+    }
+
+    public void push(int v) {
+        if (size==limit){
+            throw new RuntimeException("heap is full");
+        }
+        arr[size] = v;
+        heapInsert(arr, size++);
+    }
+
+    public int pop() {
+        if (size == 0) {
+            throw new RuntimeException("heap is empty");
+        }
+        int value = arr[0];
+        swap(arr, 0, --size);
+        heapify(arr, 0, size);
+        return value;
+    }
+
+    private void heapInsert(int[] arr, int i) {
+        while (arr[i] > arr[(i - 1) / 2]) {
+            swap(arr, i, (i - 1) / 2);
+            i = (i - 1) / 2;
+        }
+
+    }
+
+    private void heapify(int[] arr, int index, int heapSize) {
+        int left = index << 1 | 1;
+        while (left < heapSize) {
+            int largest = left+1<heapSize&&arr[left+1]>arr[left]?left+1:left;
+            largest = arr[largest] > arr[index] ? largest : index;
+            if (largest == index) {
+                return;
+            }
+            swap(arr, largest, index);
+            index = largest;
+            left = index << 1 | 1;
+        }
+    }
+    public static void swap(int[] arr, int i, int j) {
+        if (i == j || arr[i] == arr[j]) {
+            return;
+        }
+        arr[i] = arr[i] ^ arr[j];
+        arr[j] = arr[i] ^ arr[j];
+        arr[i] = arr[i] ^ arr[j];
+    }
+
+}
+
+
+class MyMaxHeap5{
+    private int size;
+    private int[] arr;
+    private final int limit;
+
+    public MyMaxHeap5(int limit) {
+        this.limit = limit;
+        this.arr = new int[limit];
+        this.size = 0;
+    }
+
+    public boolean isEmpty() {
+        return size == 0;
+    }
+
+    public void push(int value) {
+        if (this.size == this.limit) {
+            throw new RuntimeException("heap is full");
+        }
+        arr[size] = value;
+        heapInsert(arr, size++);
+    }
+
+    public int pop() {
+        if (size == 0) {
+            throw new RuntimeException("heap is empty");
+        }
+        int value = arr[0];
+        swap(arr, 0, --size);
+        heapify(arr, 0, size);
+        return value;
+    }
+
+    public void heapify(int[] arr, int i, int heapSize) {
+        int left = i << 1 | 1;
+        while (left < heapSize) {
+            int largest = left + 1 < heapSize && arr[left + 1] > arr[left] ? left + 1 : left;
+            largest = arr[largest] > arr[i] ? largest : i;
+            if (i == largest) {
+                return;
+            }
+            swap(arr, largest, i);
+            i = largest;
+            left = i << 1 | 1;
+        }
+    }
+    public void heapInsert(int[] arr, int index) {
+        while (arr[index] > arr[(index - 1) / 2]) {
+            swap(arr, index, (index - 1) / 2);
+            index = (index - 1) / 2;
+        }
+    }
+
+    public void swap(int[] arr, int i, int j) {
+        if (i == j || arr[i] == arr[j]) {
+            return;
+        }
+        arr[i] = arr[i] ^ arr[j];
+        arr[j] = arr[i] ^ arr[j];
+        arr[i] = arr[i] ^ arr[j];
+    }
+}
+
 
 class Main{
 
@@ -307,7 +439,7 @@ class Main{
         int range = 50;
         System.out.println("start!");
         PriorityQueue<Integer> queue = new PriorityQueue<>((a,b)-> {return b-a;});
-        MyMaxHeap3 heap = new MyMaxHeap3(testTimes);
+        MyMaxHeap5 heap = new MyMaxHeap5(testTimes);
         for (int i = 0; i < testTimes; i++) {
             if (heap.isEmpty()) {
                 int num = (int) ((range * Math.random() + 1) - (range * Math.random() + 1));
diff --git a/src/leo/class04_06/SortArrayDistanceLessK.java b/src/leo/class04_06/SortArrayDistanceLessK.java
index 3e18f5c..50cd2ac 100644
--- a/src/leo/class04_06/SortArrayDistanceLessK.java
+++ b/src/leo/class04_06/SortArrayDistanceLessK.java
@@ -84,7 +84,32 @@ class SortArrayDistanceLessK2{
 
 }
 
+class SortArrayDistanceLessK3 {
 
+    public static void sortArrayDistanceLessK(int[] arr, int k) {
+        if (k == 0) {
+            return;
+        }
+        if (arr.length < 2 || arr == null) {
+            return;
+        }
+        PriorityQueue<Integer> queue = new PriorityQueue<>();
+        int i;
+        for (i = 0; i < Math.min(arr.length - 1, k - 1); i++) {
+            queue.add(arr[i]);
+        }
+        int j = 0;
+        for (; i < arr.length; i++, j++) {
+            queue.add(arr[i]);
+            arr[j] = queue.poll();
+        }
+        while (!queue.isEmpty()) {
+            arr[j++] = queue.poll();
+        }
+
+    }
+
+}
 class MainK {
 
 
@@ -101,7 +126,7 @@ class MainK {
             UpsetArray(arr, k);
             int[] copyArray = ArrayUtil.copyArray(arr);
             Arrays.sort(copyArray);
-            SortArrayDistanceLessK2.sortArrayDistanceLessK(arr,k);
+            SortArrayDistanceLessK3.sortArrayDistanceLessK(arr,k);
             if (!ArrayUtil.isEqual(arr, copyArray)) {
                 ArrayUtil.printArr(arr);
                 ArrayUtil.printArr(copyArray);
diff --git a/src/leo/class06_09/CopyListWithRandom.java b/src/leo/class06_09/CopyListWithRandom.java
index 855a78c..d23261f 100644
--- a/src/leo/class06_09/CopyListWithRandom.java
+++ b/src/leo/class06_09/CopyListWithRandom.java
@@ -79,6 +79,38 @@ public class CopyListWithRandom {
         return copyHead;
     }
 
+    public static Node copyRandomNode1(Node head) {
+        if (head == null) {
+            return null;
+        }
+        Node cur = head;
+        Node next;
+        while (cur != null) {
+            next = cur.next;
+            cur.next = new Node(cur.value);
+            cur.next.next = next;
+            cur = next;
+        }
+        Node copy;
+        cur = head;
+        while (cur != null) {
+            next = cur.next.next;
+            copy = cur.next;
+            copy.rand = cur.rand == null ? null : cur.rand.next;
+            cur = next;
+        }
+        cur  = head;
+        Node copyHead = head.next;
+        while(cur!=null){
+            next = cur.next.next;
+            copy = cur.next;
+            cur.next = next;
+            copy.next = next == null ? null : next.next;
+            cur = next;
+        }
+        return copyHead;
+
+    }
 
 
     public static void main(String[] args){
@@ -90,7 +122,7 @@ public class CopyListWithRandom {
         for (int i = 0; i < testTime; i++) {
             Node node = randomNode(maxSize, range);
             Node headMap = copyRandomNodeByMap(node);
-            Node head = copyRandomNode(node);
+            Node head = copyRandomNode1(node);
             Node curNode = node;
             Node curHeadMap = headMap;
             Node curHead = head;
diff --git a/src/leo/class06_09/FindFirstIntersectNode.java b/src/leo/class06_09/FindFirstIntersectNode.java
index 1480716..f87f7fc 100644
--- a/src/leo/class06_09/FindFirstIntersectNode.java
+++ b/src/leo/class06_09/FindFirstIntersectNode.java
@@ -131,7 +131,119 @@ public class FindFirstIntersectNode {
 
     }
 
+}
+
+class FindFirstIntersectNode1{
+    public static Node getIntersectNode(Node head1, Node head2) {
+        if (head1 == null || head2 == null) {
+            return null;
+        }
+        Node loop1 = getLoop(head1);
+        Node loop2 = getLoop(head2);
+        if (loop1 != null && loop2 != null) {
+            return bothLoop(head1, loop1, head2, loop2);
+        } else if (loop1 == null && loop2 == null) {
+            return noLoop(head1, head2);
+        }
+        return null;
+    }
 
+    public static Node bothLoop(Node head1, Node loop1, Node head2, Node loop2) {
+        Node cur1 = null;
+        Node cur2 = null;
+        if (loop1 == loop2) {
+            int n = 0;
+            cur1 = head1;
+            cur2 = head2;
+            while (cur1 != loop1) {
+                n++;
+                cur1 = cur1.next;
+            }
+            while (cur2 != loop2) {
+                n--;
+                cur2 = cur2.next;
+            }
+            cur1 = n > 0 ? head1 : head2;
+            cur2 = cur1 == head1 ? head2 : head1;
+            n = Math.abs(n);
+            while (n != 0) {
+                cur1 = cur1.next;
+                n--;
+            }
+            while (cur1 != cur2) {
+                cur1 = cur1.next;
+                cur2 = cur2.next;
+            }
+
+            return cur1;
+        }else{
+            cur1 = loop1.next;
+            while (cur1 != loop1) {
+                if (cur1 == loop2) {
+                    return loop1;
+                }
+                cur1 = cur1.next;
+            }
+            return null;
+        }
+    }
+
+
+    public static Node noLoop(Node head1, Node head2) {
+        if (head1 == null || head2 == null) {
+            return null;
+        }
+        int n = 0;
+        Node cur1 = head1;
+        while (cur1 != null) {
+            n++;
+            cur1 = cur1.next;
+        }
+        Node cur2 = head2;
+        while (cur2 != null) {
+            n--;
+            cur2 = cur2.next;
+        }
+        if (cur1 != cur2) {
+            return null;
+        }
+        cur1 = n > 0 ? head1 : head2;
+        cur2 = cur1 == head1 ? head2 : head1;
+        n = Math.abs(n);
+        while (n != 0) {
+            n--;
+            cur1 = cur1.next;
+        }
+        while (cur1 != cur2) {
+            cur1 = cur1.next;
+            cur2 = cur2.next;
+        }
+        return cur1;
+    }
+
+    public static Node getLoop(Node head) {
+        if (head == null || head.next == null || head.next.next == null) {
+            return null;
+        }
+        Node slow = head.next;
+        Node fast = head.next.next;
+        while (slow != fast) {
+            if (fast.next == null || fast.next.next == null) {
+                return null;
+            }
+            slow = slow.next;
+            fast = fast.next.next;
+        }
+        fast = head;
+        while (fast != slow) {
+            slow = slow.next;
+            fast = fast.next;
+        }
+        return slow;
+    }
+}
+
+class FindFirstIntersectNode_Main{
     public static void main(String[] args) {
         // 1->2->3->4->5->6->7->null
         Node head1 = new Node(1);
@@ -147,7 +259,7 @@ public class FindFirstIntersectNode {
         head2.next = new Node(9);
         head2.next.next = new Node(8);
         head2.next.next.next = head1.next.next.next.next.next; // 8->6
-        System.out.println(getIntersectNode(head1, head2).value);
+        System.out.println(FindFirstIntersectNode1.getIntersectNode(head1, head2).value);
 
         // 1->2->3->4->5->6->7->4...
         head1 = new Node(1);
@@ -164,18 +276,14 @@ public class FindFirstIntersectNode {
         head2.next = new Node(9);
         head2.next.next = new Node(8);
         head2.next.next.next = head1.next; // 8->2
-        System.out.println(getIntersectNode(head1, head2).value);
+        System.out.println(FindFirstIntersectNode1.getIntersectNode(head1, head2).value);
 
         // 0->9->8->6->4->5->6..
         head2 = new Node(0);
         head2.next = new Node(9);
         head2.next.next = new Node(8);
         head2.next.next.next = head1.next.next.next.next.next; // 8->6
-        System.out.println(getIntersectNode(head1, head2).value);
+        System.out.println(FindFirstIntersectNode1.getIntersectNode(head1, head2).value);
 
     }
-
-
-
-
 }
diff --git a/src/leo/class06_09/IsPalindromeList.java b/src/leo/class06_09/IsPalindromeList.java
index 90edbc4..68aea8a 100644
--- a/src/leo/class06_09/IsPalindromeList.java
+++ b/src/leo/class06_09/IsPalindromeList.java
@@ -364,6 +364,48 @@ public class IsPalindromeList {
         return verify;
     }
 
+    public static boolean isPalindromeList7(Node head) {
+        if (head == null || head.next == null) {
+            return true;
+        }
+        Node n1 = head;
+        Node n2 = head;
+        while (n2.next != null && n2.next.next != null) {
+            n1 = n1.next;
+            n2 = n2.next.next;
+        }
+        //n1 is mid
+        n2 = n1.next;
+        n1.next = null;
+        Node n3;
+        while (n2 != null) {
+            n3 = n2.next;
+            n2.next = n1;
+            n1 = n2;
+            n2 = n3;
+        }
+        n2 = head;
+        n3 = n1;
+        boolean verify = true;
+        while (n1 != null && n2 != null) {
+            if (n1.value != n2.value) {
+                verify = false;
+                break;
+            }
+            n1 = n1.next;
+            n2 = n2.next;
+        }
+        n2 = n3.next;
+        n3.next = null;
+        while (n2 != null) {
+            n1 = n2.next;
+            n2.next = n3;
+            n3 = n2;
+            n2 = n1;
+        }
+        return verify;
+    }
+
 
 }
 
@@ -382,13 +424,12 @@ class IsPalindromeListMain {
             Node originNode = generateRandomNode(maxSize, range);
             Node head = copyNode(originNode);
             b = IsPalindromeList.isPalindromeListByStack(head);
-            a = IsPalindromeList.isPalindromeList6(head);
+            a = IsPalindromeList.isPalindromeList7(head);
             if (!isEqualsNode(head, originNode)) {
                 System.out.println("not equals node!");
             }
             if (a != b) {
-                System.out.println(a);
-                System.out.println(b);
+                System.out.println(a+" "+ b);
                 System.out.println("fuck!");
             }
         }
diff --git a/src/leo/class06_09/SmallerEqualBigger.java b/src/leo/class06_09/SmallerEqualBigger.java
index c3a2054..d2af1a7 100644
--- a/src/leo/class06_09/SmallerEqualBigger.java
+++ b/src/leo/class06_09/SmallerEqualBigger.java
@@ -109,6 +109,55 @@ public class SmallerEqualBigger {
             return sH;
         }
     }
+
+
+    public static Node listPartition1(Node head, int target) {
+        if (head == null || head.next == null) {
+            return head;
+        }
+        Node sH = null;
+        Node sT = null;
+        Node bH = null;
+        Node bT = null;
+        Node cur = head;
+        while (cur != null) {
+            Node next = cur.next;
+            cur.next = null;
+            if (cur.value < target) {
+                if (sH == null) {
+                    sH = cur;
+                    sT = cur;
+                }else{
+                    sT.next = cur;
+                    sT = cur;
+                }
+            } else if (cur.value == target) {
+                if (bH == null) {
+                    bH = cur;
+                    bT = cur;
+                }else{
+                    cur.next = bH;
+                    bH = cur;
+                }
+            } else if (cur.value > target) {
+                if (bT == null) {
+                    bH = cur;
+                    bT = cur;
+                }else {
+                    bT.next = cur;
+                    bT = cur;
+                }
+            }
+            cur = next;
+        }
+
+        if (sT == null) {
+            return bH;
+        }else {
+            sT.next = bH;
+            return sH;
+        }
+    }
 }
 
 class SmallerEqualBigger_Main{
@@ -126,12 +175,14 @@ class SmallerEqualBigger_Main{
         int maxSize = 5;
         int range = 100;
         Node originNode = generateRandomNode(maxSize, range);
+        Node copyNode = copyNode(originNode);
         printLinkedList(originNode);
-        // head1 = listPartition1(head1, 4);
         int i = randomInt(range);
         System.out.println(i);
-        originNode = SmallerEqualBigger.listPartition(originNode, i);
+        copyNode = SmallerEqualBigger.NodePartitionByArray.nodePartitionByArray(copyNode, i);
+        originNode = SmallerEqualBigger.listPartition1(originNode, i);
         printLinkedList(originNode);
+        printLinkedList(copyNode);
 
     }