diff --git a/src/main/java/com/dota/arr/_2711/Solution.java b/src/main/java/com/dota/arr/_2711/Solution.java
new file mode 100644
index 0000000..031a54a
--- /dev/null
+++ b/src/main/java/com/dota/arr/_2711/Solution.java
@@ -0,0 +1,39 @@
+package com.dota.arr._2711;
+
+import java.util.HashSet;
+
+class Solution {
+    public int[][] differenceOfDistinctValues(int[][] grid) {
+        int n= grid.length, m = grid[0].length;
+        var res = new int[n][m];
+        var set = new HashSet<Integer>();
+        for (int i = 0; i < n; i++) {
+            for (int j = 0; j < m; j++) {
+                int ii=i-1,jj=j-1;
+                set.clear();
+                int lcnt = 0;
+                int rcnt = 0;
+                while(ii>=0 && jj>=0) {
+                    if (!set.contains(grid[ii][jj])) {
+                        lcnt++;
+                        set.add(grid[ii][jj]);
+                    }
+                    ii--;
+                    jj--;
+                }
+                set.clear();
+                ii = i+1;
+                jj = j+1;
+                while(ii<n&&jj<m) {
+                    if (!set.contains(grid[ii][jj])) {
+                        rcnt++;
+                        set.add(grid[ii][jj]);
+                    }
+                    ii++;jj++;
+                }
+                res[i][j] = Math.abs(lcnt-rcnt);
+            }
+        }
+        return res;
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/com/dota/dp/_1696/Solution.java b/src/main/java/com/dota/dp/_1696/Solution.java
new file mode 100644
index 0000000..c7d0eb8
--- /dev/null
+++ b/src/main/java/com/dota/dp/_1696/Solution.java
@@ -0,0 +1,28 @@
+package com.dota.dp._1696;
+
+import java.util.ArrayDeque;
+import java.util.Deque;
+
+class Solution {
+	public int maxResult(int[] nums, int k) {
+		int n = nums.length;
+		var dp = new int[n];
+		dp[0] = nums[0];
+		Deque<Integer> deque = new ArrayDeque<>();
+		deque.add(0);
+		for (int i = 1; i<n; i++) {
+				int t = nums[i] + dp[deque.peek()];
+				dp[i] = t;
+				while(!deque.isEmpty() && dp[deque.peekLast()] <= t) {
+					deque.pollLast();
+				}
+
+				deque.addLast(i);
+
+				if (i>=k&&deque.peek() < i-k+1) {
+					deque.pollFirst();
+				}
+		}
+		return dp[n - 1];
+	}
+}
\ No newline at end of file
diff --git a/src/main/java/com/dota/math/_2829/Solution.java b/src/main/java/com/dota/math/_2829/Solution.java
new file mode 100644
index 0000000..9ba5024
--- /dev/null
+++ b/src/main/java/com/dota/math/_2829/Solution.java
@@ -0,0 +1,25 @@
+package com.dota.math._2829;
+
+class Solution {
+	public int minimumSum(int n, int k) {
+		int sum = 0;
+		int cnt = 0;
+		var dp = new boolean[50];
+		int i = 1;
+		while(cnt<n) {
+			if (i<k) {
+				if(!dp[i]) {
+					sum += i;
+					dp[k - i] = true;
+					cnt++;
+				}
+			} else {
+				sum += i;
+				cnt++;
+			}
+
+			i++;
+		}
+		return sum;
+	}
+}
\ No newline at end of file
diff --git a/src/main/java/com/dota/slidingWindow/_239/Solution.java b/src/main/java/com/dota/slidingWindow/_239/Solution.java
new file mode 100644
index 0000000..697bf5d
--- /dev/null
+++ b/src/main/java/com/dota/slidingWindow/_239/Solution.java
@@ -0,0 +1,26 @@
+package com.dota.slidingWindow._239;
+
+import java.util.ArrayDeque;
+import java.util.Deque;
+
+class Solution {
+	public int[] maxSlidingWindow(int[] nums, int k) {
+		Deque<Integer> deque = new ArrayDeque<>();
+		int[] res = new int[nums.length - k + 1];
+		for (int i = 0; i < nums.length; i++) {
+			while (!deque.isEmpty() && nums[i] > nums[deque.peekLast()]) {
+				deque.pollLast();
+			}
+
+			deque.offerLast(i);
+			if (deque.peekFirst() < i - k + 1) {
+				deque.pollFirst();
+			}
+
+			if (i >= k - 1) {
+				res[i - k + 1] = nums[deque.peek()];
+			}
+		}
+		return res;
+	}
+}
\ No newline at end of file