diff --git a/5.leetcode/src/com/fanxb/common/Q739.java b/5.leetcode/src/com/fanxb/common/Q739.java
new file mode 100644
index 0000000..621efbb
--- /dev/null
+++ b/5.leetcode/src/com/fanxb/common/Q739.java
@@ -0,0 +1,34 @@
+package com.fanxb.common;
+
+import java.util.Arrays;
+import java.util.Iterator;
+import java.util.LinkedList;
+
+/**
+ * Created with IntelliJ IDEA
+ *
+ * @author fanxb
+ * Date: 2020/6/11 10:58
+ */
+public class Q739 {
+    public int[] dailyTemperatures(int[] T) {
+        if (T.length == 0) {
+            return new int[0];
+        }
+        LinkedList<Integer> linkedList = new LinkedList<>();
+        int[] res = new int[T.length];
+        for (int i = 0; i < T.length; i++) {
+            int j = 0;
+            while (linkedList.size() > j && T[linkedList.get(j)] > T[i]) {
+                j++;
+            }
+            linkedList.add(j, i);
+            res[linkedList.get(j)] = i - linkedList.get(j);
+        }
+        return res;
+    }
+
+    public static void main(String[] args) {
+        System.out.println(Arrays.toString(new Q739().dailyTemperatures(new int[]{1, 2, 3})));
+    }
+}
diff --git a/5.leetcode/src/com/fanxb/common/Q9.java b/5.leetcode/src/com/fanxb/common/Q9.java
new file mode 100644
index 0000000..f0f654f
--- /dev/null
+++ b/5.leetcode/src/com/fanxb/common/Q9.java
@@ -0,0 +1,35 @@
+package com.fanxb.common;
+
+/**
+ * Created with IntelliJ IDEA
+ *
+ * @author fanxb
+ * Date: 2020/6/10 10:49
+ */
+public class Q9 {
+
+    public boolean isPalindrome(int x) {
+        //小于0的数或者末尾为0的正数肯定不是回文数
+        if (x < 0 || (x > 0 && x % 10 == 0)) {
+            return false;
+        }
+        long temp = 1;
+        while (x / (temp * 10) > 0) {
+            temp = temp * 10;
+        }
+        for (int i = 1; i < temp; temp = temp / 10, i *= 10) {
+            System.out.println(x / i % 10 + ":" + x / temp % 10);
+            if (x / i % 10 != x / temp % 10) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    public static void main(String[] args) {
+        Q9 instance = new Q9();
+        System.out.println(instance.isPalindrome(1212312));
+        System.out.println(instance.isPalindrome(1410110141));
+        System.out.println(instance.isPalindrome(-121));
+    }
+}
diff --git a/5.leetcode/src/com/fanxb/interview/Q64.java b/5.leetcode/src/com/fanxb/interview/Q64.java
new file mode 100644
index 0000000..57c4f15
--- /dev/null
+++ b/5.leetcode/src/com/fanxb/interview/Q64.java
@@ -0,0 +1,18 @@
+package com.fanxb.interview;
+
+/**
+ * Created with IntelliJ IDEA
+ *
+ * @author fanxb
+ * Date: 2020/6/11 9:56
+ */
+public class Q64 {
+    public int sumNums(int n) {
+        boolean temp = n - 1 > 0 && (n += sumNums(n - 1)) > 0;
+        return n;
+    }
+
+    public static void main(String[] args) {
+        System.out.println(new Q64().sumNums(10));
+    }
+}