diff --git a/README.md b/README.md
index f0ae2d5..9e889a8 100644
--- a/README.md
+++ b/README.md
@@ -194,6 +194,10 @@ C++标准库提供的数据结构实在是太多了，参考[C++标准库头文
 
 ### 数组/队列/集合/映射
 
+- [找出叠涂元素](src/array/first_completely_painted_row_or_column.cpp)  [数组, 哈希表, 矩阵]
+
+  - LeetCode 2661. 找出叠涂元素 <https://leetcode.cn/problems/first-completely-painted-row-or-column>
+
 - [打家劫舍](src/array/house_robber.cpp)  [数组, 动态规划]
 
   - LeetCode 198. 打家劫舍 <https://leetcode.cn/problems/house-robber>
diff --git a/images/array/first_completely_painted_row_or_column.jpeg b/images/array/first_completely_painted_row_or_column.jpeg
new file mode 100644
index 0000000..5bfdb75
Binary files /dev/null and b/images/array/first_completely_painted_row_or_column.jpeg differ
diff --git a/src/array/first_completely_painted_row_or_column.cpp b/src/array/first_completely_painted_row_or_column.cpp
new file mode 100644
index 0000000..b059054
--- /dev/null
+++ b/src/array/first_completely_painted_row_or_column.cpp
@@ -0,0 +1,36 @@
+// 找出叠涂元素
+// https://leetcode.cn/problems/first-completely-painted-row-or-column
+// INLINE  ../../images/array/first_completely_painted_row_or_column.jpeg
+
+#include <headers.hpp>
+
+class Solution {
+public:
+  int firstCompleteIndex(vector<int> &arr, vector<vector<int>> &mat) {
+    int n = mat.size();
+    int m = mat[0].size();
+    unordered_map<int, pair<int, int>> mp;
+    vector<int> rowCnt(n, 0);
+    vector<int> colCnt(m, 0);
+    int completeIndex = -1;
+    for (int i = 0; i < n; ++i) {
+      for (int j = 0; j < m; ++j) {
+        mp[mat[i][j]] = {i, j};
+      }
+    }
+    for (int i = 0; i < arr.size(); ++i) {
+      auto &v = mp[arr[i]];
+      ++rowCnt[v.first];
+      if (rowCnt[v.first] == m) {
+        completeIndex = i;
+        break;
+      }
+      ++colCnt[v.second];
+      if (colCnt[v.second] == n) {
+        completeIndex = i;
+        break;
+      }
+    }
+    return completeIndex;
+  }
+};
\ No newline at end of file
diff --git a/src/lib/list_node.cpp b/src/lib/list_node.cpp
index 04bfe4f..790f1c3 100644
--- a/src/lib/list_node.cpp
+++ b/src/lib/list_node.cpp
@@ -1,16 +1,14 @@
 #include <list_node.hpp>
 
 // 创建链表，输入数组和数组长度，返回链表头指针
-ListNode *createLinkedList(int arr[], int n)
-{
+ListNode *createLinkedList(int arr[], int n) {
   if (n == 0)
     return nullptr;
 
   ListNode *head = new ListNode(arr[0]);
 
   ListNode *curNode = head;
-  for (int i = 1; i < n; i++)
-  {
+  for (int i = 1; i < n; i++) {
     curNode->next = new ListNode(arr[i]);
     curNode = curNode->next;
   }
@@ -18,12 +16,10 @@ ListNode *createLinkedList(int arr[], int n)
 }
 
 // 将链表转换为字符串输出
-string listNodeToString(ListNode *head)
-{
+string listNodeToString(ListNode *head) {
   string str = "";
   ListNode *curNode = head;
-  while (curNode != nullptr)
-  {
+  while (curNode != nullptr) {
     str.append(to_string(curNode->val));
     str.append(" -> ");
     curNode = curNode->next;
@@ -33,11 +29,9 @@ string listNodeToString(ListNode *head)
 }
 
 // 输出链表
-void printLinkedList(ListNode *head)
-{
+void printLinkedList(ListNode *head) {
   ListNode *curNode = head;
-  while (curNode != nullptr)
-  {
+  while (curNode != nullptr) {
     cout << curNode->val << " -> ";
     curNode = curNode->next;
   }
@@ -45,11 +39,9 @@ void printLinkedList(ListNode *head)
 }
 
 // 删除链表
-void deleteLinkedList(ListNode *head)
-{
+void deleteLinkedList(ListNode *head) {
   ListNode *curNode = head;
-  while (curNode != nullptr)
-  {
+  while (curNode != nullptr) {
     ListNode *delNode = curNode;
     curNode = curNode->next;
     delete delNode;
diff --git a/test/array/first_completely_painted_row_or_column_test.cpp b/test/array/first_completely_painted_row_or_column_test.cpp
new file mode 100644
index 0000000..908fb25
--- /dev/null
+++ b/test/array/first_completely_painted_row_or_column_test.cpp
@@ -0,0 +1,20 @@
+#include <array/first_completely_painted_row_or_column.cpp>
+
+TEST(找出叠涂元素, firstCompleteIndex) {
+  Solution solution;
+  // 示例 1：
+  // 输入：arr = [1,3,4,2], mat = [[1,4],[2,3]]
+  // 输出：2
+  // 解释：遍历如上图所示，arr[2] 在矩阵中的第一行或第二列上都被涂色。
+  vector<int> arr1 = {1, 3, 4, 2};
+  vector<vector<int>> mat1 = {{1, 4}, {2, 3}};
+  EXPECT_EQ(solution.firstCompleteIndex(arr1, mat1), 2);
+
+  // 示例 2：
+  // 输入：arr = [2,8,7,4,1,3,5,6,9], mat = [[3,2,5],[1,4,6],[8,7,9]]
+  // 输出：3
+  // 解释：遍历如上图所示，arr[3] 在矩阵中的第二列上都被涂色。
+  vector<int> arr2 = {2, 8, 7, 4, 1, 3, 5, 6, 9};
+  vector<vector<int>> mat2 = {{3, 2, 5}, {1, 4, 6}, {8, 7, 9}};
+  EXPECT_EQ(solution.firstCompleteIndex(arr2, mat2), 3);
+}
diff --git a/test/lib/lib_test.cpp b/test/lib/lib_test.cpp
index 47f80f9..08b7709 100644
--- a/test/lib/lib_test.cpp
+++ b/test/lib/lib_test.cpp
@@ -1,4 +1,4 @@
-// 执行编译时间：2023-09-17 15:52:26
+// 执行编译时间：2023-12-01 16:35:53
 #include <gtest/gtest.h>
 #include <lib.hpp>