diff --git a/solution/0800-0899/0830.Positions of Large Groups/README.md b/solution/0800-0899/0830.Positions of Large Groups/README.md
index 51b8de3282a0c..389aa0187ce17 100644
--- a/solution/0800-0899/0830.Positions of Large Groups/README.md	
+++ b/solution/0800-0899/0830.Positions of Large Groups/README.md	
@@ -110,7 +110,7 @@ class Solution {
                 ++j;
             }
             if (j - i >= 3) {
-                ans.add(Arrays.asList(i, j - 1));
+                ans.add(List.of(i, j - 1));
             }
             i = j;
         }
@@ -163,6 +163,28 @@ func largeGroupPositions(s string) [][]int {
 }
 ```
 
+#### TypeScript
+
+```ts
+function largeGroupPositions(s: string): number[][] {
+    const n = s.length;
+    const ans: number[][] = [];
+
+    for (let i = 0; i < n; ) {
+        let j = i;
+        while (j < n && s[j] === s[i]) {
+            ++j;
+        }
+        if (j - i >= 3) {
+            ans.push([i, j - 1]);
+        }
+        i = j;
+    }
+
+    return ans;
+}
+```
+
 <!-- tabs:end -->
 
 <!-- solution:end -->
diff --git a/solution/0800-0899/0830.Positions of Large Groups/README_EN.md b/solution/0800-0899/0830.Positions of Large Groups/README_EN.md
index 34473b9fdbac5..7f6c880c414fd 100644
--- a/solution/0800-0899/0830.Positions of Large Groups/README_EN.md	
+++ b/solution/0800-0899/0830.Positions of Large Groups/README_EN.md	
@@ -65,7 +65,11 @@ tags:
 
 <!-- solution:start -->
 
-### Solution 1
+### Solution 1: Two Pointers
+
+We use two pointers $i$ and $j$ to find the start and end positions of each group, then check if the group length is greater than or equal to $3$. If so, we add it to the result array.
+
+The time complexity is $O(n)$, where $n$ is the length of the string $s$.
 
 <!-- tabs:start -->
 
@@ -100,7 +104,7 @@ class Solution {
                 ++j;
             }
             if (j - i >= 3) {
-                ans.add(Arrays.asList(i, j - 1));
+                ans.add(List.of(i, j - 1));
             }
             i = j;
         }
@@ -153,6 +157,28 @@ func largeGroupPositions(s string) [][]int {
 }
 ```
 
+#### TypeScript
+
+```ts
+function largeGroupPositions(s: string): number[][] {
+    const n = s.length;
+    const ans: number[][] = [];
+
+    for (let i = 0; i < n; ) {
+        let j = i;
+        while (j < n && s[j] === s[i]) {
+            ++j;
+        }
+        if (j - i >= 3) {
+            ans.push([i, j - 1]);
+        }
+        i = j;
+    }
+
+    return ans;
+}
+```
+
 <!-- tabs:end -->
 
 <!-- solution:end -->
diff --git a/solution/0800-0899/0830.Positions of Large Groups/Solution.java b/solution/0800-0899/0830.Positions of Large Groups/Solution.java
index 07451deabe1a3..72135bef15d35 100644
--- a/solution/0800-0899/0830.Positions of Large Groups/Solution.java	
+++ b/solution/0800-0899/0830.Positions of Large Groups/Solution.java	
@@ -9,10 +9,10 @@ public List<List<Integer>> largeGroupPositions(String s) {
                 ++j;
             }
             if (j - i >= 3) {
-                ans.add(Arrays.asList(i, j - 1));
+                ans.add(List.of(i, j - 1));
             }
             i = j;
         }
         return ans;
     }
-}
\ No newline at end of file
+}
diff --git a/solution/0800-0899/0830.Positions of Large Groups/Solution.ts b/solution/0800-0899/0830.Positions of Large Groups/Solution.ts
new file mode 100644
index 0000000000000..5fdaeb9ca7816
--- /dev/null
+++ b/solution/0800-0899/0830.Positions of Large Groups/Solution.ts	
@@ -0,0 +1,17 @@
+function largeGroupPositions(s: string): number[][] {
+    const n = s.length;
+    const ans: number[][] = [];
+
+    for (let i = 0; i < n; ) {
+        let j = i;
+        while (j < n && s[j] === s[i]) {
+            ++j;
+        }
+        if (j - i >= 3) {
+            ans.push([i, j - 1]);
+        }
+        i = j;
+    }
+
+    return ans;
+}
diff --git a/solution/3200-3299/3240.Minimum Number of Flips to Make Binary Grid Palindromic II/README.md b/solution/3200-3299/3240.Minimum Number of Flips to Make Binary Grid Palindromic II/README.md
index 67edbe2fc8b12..6b71721997a17 100644
--- a/solution/3200-3299/3240.Minimum Number of Flips to Make Binary Grid Palindromic II/README.md	
+++ b/solution/3200-3299/3240.Minimum Number of Flips to Make Binary Grid Palindromic II/README.md	
@@ -97,7 +97,7 @@ tags:
 对于后两种情况，我们需要统计最中间的一行或一列中对应位置不相同的格子对数 $\text{diff}$，以及对应位置相同且为 $1$ 的格子个数 $\text{cnt1}$，然后再分情况讨论：
 
 -   如果 $\text{cnt1} \bmod 4 = 0$，那么我们只需要将 $\text{diff}$ 个格子变成 $0$ 即可，操作次数为 $\text{diff}$；
--   否则，说明 $\text{cnt1} = 2$，此时如果 $\text{diff} \lt 0$，我们可以将其中一个格子变成 $1$，使得 $\text{cnt1} = 4$，那么剩下的 $\text{diff} - 1$ 个格子变成 $0$ 即可，操作次数一共为 $\text{diff}$。
+-   否则，说明 $\text{cnt1} = 2$，此时如果 $\text{diff} \gt 0$，我们可以将其中一个格子变成 $1$，使得 $\text{cnt1} = 4$，那么剩下的 $\text{diff} - 1$ 个格子变成 $0$ 即可，操作次数一共为 $\text{diff}$。
 -   否则，如果 $\text{diff} = 0$，我们就把 $\text{2}$ 个格子变成 $0$，使得 $\text{cnt1} \bmod 4 = 0$，操作次数为 $\text{2}$。
 
 我们将操作次数累加到答案中，最后返回答案即可。
diff --git a/solution/3200-3299/3240.Minimum Number of Flips to Make Binary Grid Palindromic II/README_EN.md b/solution/3200-3299/3240.Minimum Number of Flips to Make Binary Grid Palindromic II/README_EN.md
index 93c7473258aa7..cd3632d672823 100644
--- a/solution/3200-3299/3240.Minimum Number of Flips to Make Binary Grid Palindromic II/README_EN.md	
+++ b/solution/3200-3299/3240.Minimum Number of Flips to Make Binary Grid Palindromic II/README_EN.md	
@@ -94,8 +94,8 @@ Next, we discuss the parity of $m$ and $n$:
 
 For the latter two cases, we need to count the number of differing pairs of cells $\text{diff}$ in the middle row or column, and the number of cells that are the same and equal to $1$ $\text{cnt1}$. Then we discuss the following cases:
 
--   If $\text{cnt1} \bmod 4 = 0$, we only need to change the $\text{diff}$ cells to $0$, and the number of operations is $\text{diff}$.
--   Otherwise, if $\text{cnt1} = 2$, if $\text{diff} \lt 0$, we can change one of the cells to $1$ to make $\text{cnt1} = 4$, and then change the remaining $\text{diff} - 1$ cells to $0$. The total number of operations is $\text{diff}$.
+-   If $\text{cnt1} \bmod 4 = 0$, we only need to change the $\text{diff}$ cells to $0$, and the number of operations is $\text{diff                }$.
+-   Otherwise, if $\text{cnt1} = 2$, if $\text{diff} \gt 0$, we can change one of the cells to $1$ to make $\text{cnt1} = 4$, and then change the remaining $\text{diff} - 1$ cells to $0$. The total number of operations is $\text{diff}$.
 -   Otherwise, if $\text{diff} = 0$, we change the $2$ cells to $0$ to make $\text{cnt1} \bmod 4 = 0$, and the number of operations is $2$.
 
 We add the number of operations to the answer and finally return the answer.