diff --git a/src/main/java/com/cool/hot100/dp/Num198.java b/src/main/java/com/cool/hot100/dp/Num198.java
new file mode 100644
index 0000000..5b73ba5
--- /dev/null
+++ b/src/main/java/com/cool/hot100/dp/Num198.java
@@ -0,0 +1,45 @@
+package com.cool.hot100.dp;
+
+/**
+ * Created with IntelliJ IDEA.
+ *
+ * @Author: Cool
+ * @Date: 2024/09/24/14:10
+ * DayNumber 1
+ * Hard 2
+ * Level ?
+ */
+public class Num198 {
+    /**
+     * 滚动数组
+     * @param nums
+     * @return
+     */
+    public int rob(int[] nums) {
+        int noSteal=0;
+        int steal=nums[0];
+        for(int i=1;i<nums.length;i++){
+            int noStealTemp=noSteal;
+            noSteal=Math.max(noSteal,steal);
+            steal=noStealTemp+nums[i];
+        }
+        return Math.max(noSteal,steal);
+    }
+
+    /**
+     * 非滚动数组
+     * @param nums
+     * @return
+     */
+    public int rob1(int[] nums) {
+        int[][]dp=new int[nums.length][2];
+        dp[0][0]=0;
+        dp[0][1]=nums[0];
+        for(int i=1;i<nums.length;i++){
+            dp[i][0]=Math.max(dp[i-1][0],dp[i-1][1]);
+            dp[i][1]=dp[i-1][0]+nums[i];
+        }
+        return Math.max(dp[nums.length-1][0],dp[nums.length-1][1]);
+    }
+
+}
diff --git a/src/main/java/com/cool/hot100/dp/Num279.java b/src/main/java/com/cool/hot100/dp/Num279.java
new file mode 100644
index 0000000..6d0a90c
--- /dev/null
+++ b/src/main/java/com/cool/hot100/dp/Num279.java
@@ -0,0 +1,20 @@
+package com.cool.hot100.dp;
+
+import org.junit.Test;
+
+/**
+ * Created with IntelliJ IDEA.
+ *
+ * @Author: Cool
+ * @Date: 2024/09/24/16:58
+ * DayNumber 2
+ * Hard 2
+ * Level ?
+ */
+public class Num279 {
+
+
+    public int numSquares(int n) {
+
+    }
+}