diff --git a/src/main/java/com/dota/slidingWindow/_1695/Solution.java b/src/main/java/com/dota/slidingWindow/_1695/Solution.java
new file mode 100644
index 0000000..e044399
--- /dev/null
+++ b/src/main/java/com/dota/slidingWindow/_1695/Solution.java
@@ -0,0 +1,21 @@
+package com.dota.slidingWindow._1695;
+
+class Solution {
+	public int maximumUniqueSubarray(int[] nums) {
+		var dp = new int[10001];
+		var res = 0;
+		int sum = 0;
+		int l = 0;
+		for (int num : nums) {
+			dp[num]++;
+			sum += num;
+			while (dp[num] == 2) {
+				sum -= nums[l];
+				dp[nums[l]]--;
+				l++;
+			}
+			res = Math.max(res, sum);
+		}
+		return res;
+	}
+}
\ No newline at end of file
diff --git a/src/main/java/com/dota/slidingWindow/_2904/Solution.java b/src/main/java/com/dota/slidingWindow/_2904/Solution.java
new file mode 100644
index 0000000..5b1ffc8
--- /dev/null
+++ b/src/main/java/com/dota/slidingWindow/_2904/Solution.java
@@ -0,0 +1,38 @@
+package com.dota.slidingWindow._2904;
+
+class Solution {
+    public String shortestBeautifulSubstring(String s, int k) {
+        int l = 0;
+        int cnt = 0;
+        String res = "";
+        for (int i = 0; i < s.length(); i++) {
+           if (s.charAt(i) == '0') {
+               continue;
+           }
+
+           cnt++;
+           if (cnt==k) {
+               while(s.charAt(l)=='0') {
+                   l++;
+               }
+               if (res.isEmpty()) {
+                   res = s.substring(l, i+1);
+               } else {
+                   if (i+1-l < res.length()) {
+                       res = s.substring(l, i+1);
+                   } else if (i+1-l==res.length() && s.substring(l,i+1).compareTo(res)<0) {
+                       res = s.substring(l,i+1);
+                   }
+               }
+           }
+
+           while(cnt==k||(l<s.length()&& s.charAt(l)=='0')) {
+               if (s.charAt(l)=='1') {
+                   cnt--;
+               }
+               l++;
+           }
+        }
+        return res;
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/com/dota/slidingWindow/_2958/Solution.java b/src/main/java/com/dota/slidingWindow/_2958/Solution.java
new file mode 100644
index 0000000..f816e56
--- /dev/null
+++ b/src/main/java/com/dota/slidingWindow/_2958/Solution.java
@@ -0,0 +1,20 @@
+package com.dota.slidingWindow._2958;
+
+import java.util.HashMap;
+
+class Solution {
+    public int maxSubarrayLength(int[] nums, int k) {
+        int res=0;
+        int l = 0;
+        var dp = new HashMap<Integer, Integer>();
+        for (int i = 0; i < nums.length; i++) {
+            dp.put(nums[i], dp.getOrDefault(nums[i], 0) + 1);
+            while (dp.get(nums[i]) > k) {
+                dp.put(nums[l], dp.get(nums[l]) - 1);
+                l++;
+            }
+            res = Math.max(res, i - l + 1);
+        }
+        return res;
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/com/dota/slidingWindow/_904/Solution.java b/src/main/java/com/dota/slidingWindow/_904/Solution.java
new file mode 100644
index 0000000..0988921
--- /dev/null
+++ b/src/main/java/com/dota/slidingWindow/_904/Solution.java
@@ -0,0 +1,40 @@
+package com.dota.slidingWindow._904;
+
+class Solution {
+	public int totalFruit(int[] fruits) {
+		int res = 0;
+		int n = fruits.length;
+		var dp = new int[n];
+		int cnt = 0;
+		int l = 0;
+		for (int i = 0; i < n; i++) {
+			var idx = fruits[i];
+			dp[idx]++;
+			if (dp[idx] == 1) {
+				cnt++;
+			}
+			while (cnt > 2) {
+				idx = fruits[l++];
+				dp[idx]--;
+				if (dp[idx] == 0) {
+					cnt--;
+				}
+			}
+			res = Math.max(res, i - l + 1);
+		}
+		return res;
+	}
+}
+
+class Saolution {
+	public int minimumOperations(int[] nums) {
+		var dp = new int[101];
+		for (int i = nums.length - 1; i >= 0; i--) {
+			dp[nums[i]]++;
+			if (dp[nums[i]] == 2) {
+				return (i+3)/3;
+			}
+		}
+		return 0;
+	}
+}
\ No newline at end of file