diff --git a/C++/DiagonalSortMatrix.cpp b/C++/DiagonalSortMatrix.cpp
new file mode 100644
index 0000000..8943b1a
--- /dev/null
+++ b/C++/DiagonalSortMatrix.cpp
@@ -0,0 +1,58 @@
+//https://leetcode.com/problems/sort-the-matrix-diagonally/
+class Solution
+{
+public:
+    vector<vector<int>> diagonalSort(vector<vector<int>> &mat)
+    {
+        int n = mat.size();
+        int m = mat[0].size();
+        int x, y, counter;
+        for (int i = 1; i <= m; i++)
+        {
+            vector<int> val;
+            x = i;
+            y = 0;
+            while (x < m && y < n)
+            {
+                val.push_back(mat[y][x]);
+                x++;
+                y++;
+            }
+            sort(val.begin(), val.end());
+            x = i;
+            y = 0;
+            counter = 0;
+            while (x < m && y < n)
+            {
+                mat[y][x] = val[counter];
+                counter++;
+                x++;
+                y++;
+            }
+        }
+        for (int i = 1; i <= n; i++)
+        {
+            vector<int> val;
+            x = 0;
+            y = i;
+            while (x < m && y < n)
+            {
+                val.push_back(mat[y][x]);
+                x++;
+                y++;
+            }
+            sort(val.begin(), val.end());
+            x = 0;
+            y = i;
+            counter = 0;
+            while (x < m && y < n)
+            {
+                mat[y][x] = val[counter];
+                counter++;
+                x++;
+                y++;
+            }
+        }
+        return mat;
+    }
+};