diff --git a/README.md b/README.md
index 952c3851..a90ef380 100644
--- a/README.md
+++ b/README.md
@@ -717,4 +717,5 @@ LeetCode
 |1419|[Minimum Number of Frogs Croaking](https://leetcode.com/problems/minimum-number-of-frogs-croaking/)|c|[c++](./src/1419-Minimum-Number-of-Frogs-Croaking/1419.cpp)|[python](./src/1419-Minimum-Number-of-Frogs-Croaking/1419.py)|[go](./src/1419-Minimum-Number-of-Frogs-Croaking/1419.go)|[js](./src/1419-Minimum-Number-of-Frogs-Croaking/1419.js)|[java](./src/1419-Minimum-Number-of-Frogs-Croaking/1419.java)|Medium|
 |1420|[Build Array Where You Can Find The Maximum Exactly K Comparisons](https://leetcode.com/problems/build-array-where-you-can-find-the-maximum-exactly-k-comparisons/)|c|[c++](./src/1420-Build-Array-Where-You-Can-Find-The-Maximum-Exactly-K-Comparisons/1420.cpp)|[python](./src/1420-Build-Array-Where-You-Can-Find-The-Maximum-Exactly-K-Comparisons/1420.py)|[go](./src/1420-Build-Array-Where-You-Can-Find-The-Maximum-Exactly-K-Comparisons/1420.go)|[js](./src/1420-Build-Array-Where-You-Can-Find-The-Maximum-Exactly-K-Comparisons/1420.js)|[java](./src/1420-Build-Array-Where-You-Can-Find-The-Maximum-Exactly-K-Comparisons/1420.java)|Hard|
 |1422|[Maximum Score After Splitting a String](https://leetcode.com/problems/maximum-score-after-splitting-a-string/)|c|[c++](./src/1422-Maximum-Score-After-Splitting-a-String/1422.cpp)|[python](./src/1422-Maximum-Score-After-Splitting-a-String/1422.py)|[go](./src/1422-Maximum-Score-After-Splitting-a-String/1422.go)|[js](./src/1422-Maximum-Score-After-Splitting-a-String/1422.js)|[java](./src/1422-Maximum-Score-After-Splitting-a-String/1422.java)|Easy|
-|1423|[Maximum Points You Can Obtain from Cards](https://leetcode.com/problems/maximum-points-you-can-obtain-from-cards/)|c|[c++](./src/1423-Maximum-Points-You-Can-Obtain-from-Cards/1423.cpp)|[python](./src/1423-Maximum-Points-You-Can-Obtain-from-Cards/1423.py)|[go](./src/1423-Maximum-Points-You-Can-Obtain-from-Cards/1423.go)|[js](./src/1423-Maximum-Points-You-Can-Obtain-from-Cards/1423.js)|[java](./src/1423-Maximum-Points-You-Can-Obtain-from-Cards/1423.java)|Medium|
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+|1423|[Maximum Points You Can Obtain from Cards](https://leetcode.com/problems/maximum-points-you-can-obtain-from-cards/)|c|[c++](./src/1423-Maximum-Points-You-Can-Obtain-from-Cards/1423.cpp)|[python](./src/1423-Maximum-Points-You-Can-Obtain-from-Cards/1423.py)|[go](./src/1423-Maximum-Points-You-Can-Obtain-from-Cards/1423.go)|[js](./src/1423-Maximum-Points-You-Can-Obtain-from-Cards/1423.js)|[java](./src/1423-Maximum-Points-You-Can-Obtain-from-Cards/1423.java)|Medium|
+|1424|[Diagonal Traverse II](https://leetcode.com/problems/diagonal-traverse-ii/)|c|[c++](./src/1424-Diagonal-Traverse-II/1424.cpp)|[python](./src/1424-Diagonal-Traverse-II/1424.py)|[go](./src/1424-Diagonal-Traverse-II/1424.go)|[js](./src/1424-Diagonal-Traverse-II/1424.js)|[java](./src/1424-Diagonal-Traverse-II/1424.java)|Medium|
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diff --git a/src/1424-Diagonal-Traverse-II/1424.cpp b/src/1424-Diagonal-Traverse-II/1424.cpp
new file mode 100644
index 00000000..d2ac2396
--- /dev/null
+++ b/src/1424-Diagonal-Traverse-II/1424.cpp
@@ -0,0 +1,22 @@
+class Solution {
+public:
+    vector<int> findDiagonalOrder(vector<vector<int>>& nums) {
+        vector<vector<int>> mat;
+        int n = 0, k = 0;
+        for (int i = 0; i < nums.size(); i++) {
+            vector<int> row = nums[i];
+            for (int j = 0; j < row.size(); j++, n++) {
+                if (i + j >= mat.size()) mat.push_back({});
+                mat[i + j].emplace_back(row[j]);
+            }
+        }
+        
+        vector<int> res(n);
+        for (auto& diag : mat) {
+            for (int i = diag.size() - 1; i >= 0; i--) {
+                res[k++] = diag[i];
+            }
+        }
+        return res;
+    }
+};
\ No newline at end of file
diff --git a/src/1424-Diagonal-Traverse-II/1424.go b/src/1424-Diagonal-Traverse-II/1424.go
new file mode 100644
index 00000000..388f15f3
--- /dev/null
+++ b/src/1424-Diagonal-Traverse-II/1424.go
@@ -0,0 +1,19 @@
+func findDiagonalOrder(nums [][]int) []int {
+    mat := [][]int{}
+    for i := 0; i < len(nums); i++ {
+        for j := 0; j < len(nums[i]); j++ {
+            if i + j >= len(mat) {
+                mat = append(mat, []int{})
+            }
+            mat[i + j] = append(mat[i + j], nums[i][j])
+        }
+    }
+    
+    res := []int{}
+    for _, diag := range mat {
+        for i := len(diag) - 1; i >= 0; i-- {
+            res = append(res, diag[i])
+        }
+    }
+    return res
+}
\ No newline at end of file
diff --git a/src/1424-Diagonal-Traverse-II/1424.java b/src/1424-Diagonal-Traverse-II/1424.java
new file mode 100644
index 00000000..19cccb35
--- /dev/null
+++ b/src/1424-Diagonal-Traverse-II/1424.java
@@ -0,0 +1,21 @@
+class Solution {
+    public int[] findDiagonalOrder(List<List<Integer>> nums) {
+        List<Deque<Integer>> mat = new ArrayList<>();
+        int n = 0, k = 0;
+        for (int i = 0; i < nums.size(); i++) {
+            List<Integer> row = nums.get(i);
+            for (int j = 0; j < row.size(); j++, n++) {
+                if (i + j >= mat.size()) mat.add(new ArrayDeque());
+                mat.get(i + j).push(row.get(j));
+            }
+        }
+        
+        int[] res = new int[n];
+        for (Deque<Integer> diag : mat) {
+            for (int num : diag) {
+                res[k++] = num;
+            }
+        }
+        return res;
+    }
+}
\ No newline at end of file
diff --git a/src/1424-Diagonal-Traverse-II/1424.js b/src/1424-Diagonal-Traverse-II/1424.js
new file mode 100644
index 00000000..848910a7
--- /dev/null
+++ b/src/1424-Diagonal-Traverse-II/1424.js
@@ -0,0 +1,17 @@
+var findDiagonalOrder = function(nums) {
+    let mat = [];
+    for (let i = 0; i < nums.length; i++) {
+        for (let j = 0; j < nums[i].length; j++) {
+            if (i + j >= mat.length) mat.push([]);
+            mat[i + j].unshift(nums[i][j]);
+        }
+    }
+    
+    let res = [];
+    for (let diag of mat) {
+        for (let num of diag) {
+            res.push(num);
+        }
+    }
+    return res;
+};
\ No newline at end of file
diff --git a/src/1424-Diagonal-Traverse-II/1424.py b/src/1424-Diagonal-Traverse-II/1424.py
new file mode 100644
index 00000000..3cf0fc1f
--- /dev/null
+++ b/src/1424-Diagonal-Traverse-II/1424.py
@@ -0,0 +1,9 @@
+class Solution:
+    def findDiagonalOrder(self, nums: List[List[int]]) -> List[int]:
+        res = []
+        for i, r in enumerate(nums):
+            for j, a in enumerate(r):
+                if len(res) <= i + j:
+                    res.append([])
+                res[i + j].append(a)
+        return [a for r in res for a in r[::-1]]
\ No newline at end of file
diff --git a/src/addProb.py b/src/addProb.py
index c758320c..fc469a0d 100644
--- a/src/addProb.py
+++ b/src/addProb.py
@@ -2,9 +2,9 @@
 import os, bisect
 
 # 题目名称
-name = "Maximum Points You Can Obtain from Cards"
-ID = 1423
-url = "https://leetcode.com/problems/maximum-points-you-can-obtain-from-cards/"
+name = "Diagonal Traverse II"
+ID = 1424
+url = "https://leetcode.com/problems/diagonal-traverse-ii/"
 difficult = "Medium"
 prog = ['c', 'cpp', 'py', 'go', 'js', 'java']