diff --git a/leetcode/2601-2700/2661.First-Completely-Painted-Row-or-Column/1.jpg b/leetcode/2601-2700/2661.First-Completely-Painted-Row-or-Column/1.jpg
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diff --git a/leetcode/2601-2700/2661.First-Completely-Painted-Row-or-Column/2.jpg b/leetcode/2601-2700/2661.First-Completely-Painted-Row-or-Column/2.jpg
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diff --git a/leetcode/2601-2700/2661.First-Completely-Painted-Row-or-Column/README.md b/leetcode/2601-2700/2661.First-Completely-Painted-Row-or-Column/README.md
new file mode 100644
index 000000000..169163cb8
--- /dev/null
+++ b/leetcode/2601-2700/2661.First-Completely-Painted-Row-or-Column/README.md
@@ -0,0 +1,35 @@
+# [2661.First Completely Painted Row or Column][title]
+
+## Description
+You are given a **0-indexed** integer array `arr`, and an `m x n` integer **matrix** `mat`. `arr` and `mat` both contain **all** the integers in the range `[1, m * n]`.
+
+Go through each index `i` in `arr` starting from index `0` and paint the cell in `mat` containing the integer `arr[i]`.
+
+Return the smallest index `i` at which either a row or a column will be completely painted in `mat`.
+
+**Example 1:**  
+
+![1](./1.jpg)
+
+```
+Input: arr = [1,3,4,2], mat = [[1,4],[2,3]]
+Output: 2
+Explanation: The moves are shown in order, and both the first row and second column of the matrix become fully painted at arr[2].
+```
+
+**EXample 2:**  
+
+![2](./2.jpg)
+
+```
+Input: arr = [2,8,7,4,1,3,5,6,9], mat = [[3,2,5],[1,4,6],[8,7,9]]
+Output: 3
+Explanation: The second column becomes fully painted at arr[3].
+```
+
+## 结语
+
+如果你同我一样热爱数据结构、算法、LeetCode，可以关注我 GitHub 上的 LeetCode 题解：[awesome-golang-algorithm][me]
+
+[title]: https://leetcode.com/problems/first-completely-painted-row-or-column
+[me]: https://github.com/kylesliu/awesome-golang-algorithm
diff --git a/leetcode/2601-2700/2661.First-Completely-Painted-Row-or-Column/Solution.go b/leetcode/2601-2700/2661.First-Completely-Painted-Row-or-Column/Solution.go
index d115ccf5e..572b4598c 100755
--- a/leetcode/2601-2700/2661.First-Completely-Painted-Row-or-Column/Solution.go
+++ b/leetcode/2601-2700/2661.First-Completely-Painted-Row-or-Column/Solution.go
@@ -1,5 +1,21 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func Solution(arr []int, mat [][]int) int {
+	m, n := len(mat), len(mat[0])
+	rows, cols := make([]int, m), make([]int, n)
+	key := make(map[int][2]int)
+	for i := range m {
+		for j := range n {
+			key[mat[i][j]] = [2]int{i, j}
+		}
+	}
+	for i := range arr {
+		pos := key[arr[i]]
+		rows[pos[0]]++
+		cols[pos[1]]++
+		if rows[pos[0]] == n || cols[pos[1]] == m {
+			return i
+		}
+	}
+	return len(arr) - 1
 }
diff --git a/leetcode/2601-2700/2661.First-Completely-Painted-Row-or-Column/Solution_test.go b/leetcode/2601-2700/2661.First-Completely-Painted-Row-or-Column/Solution_test.go
index 14ff50eb4..0f23ccc98 100755
--- a/leetcode/2601-2700/2661.First-Completely-Painted-Row-or-Column/Solution_test.go
+++ b/leetcode/2601-2700/2661.First-Completely-Painted-Row-or-Column/Solution_test.go
@@ -10,30 +10,30 @@ func TestSolution(t *testing.T) {
 	//	测试用例
 	cases := []struct {
 		name   string
-		inputs bool
-		expect bool
+		arr    []int
+		mat    [][]int
+		expect int
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", []int{1, 3, 4, 2}, [][]int{{1, 4}, {2, 3}}, 2},
+		{"TestCase2", []int{2, 8, 7, 4, 1, 3, 5, 6, 9}, [][]int{{3, 2, 5}, {1, 4, 6}, {8, 7, 9}}, 3},
 	}
 
 	//	开始测试
 	for i, c := range cases {
 		t.Run(c.name+" "+strconv.Itoa(i), func(t *testing.T) {
-			got := Solution(c.inputs)
+			got := Solution(c.arr, c.mat)
 			if !reflect.DeepEqual(got, c.expect) {
-				t.Fatalf("expected: %v, but got: %v, with inputs: %v",
-					c.expect, got, c.inputs)
+				t.Fatalf("expected: %v, but got: %v, with inputs: %v %v",
+					c.expect, got, c.arr, c.mat)
 			}
 		})
 	}
 }
 
-//	压力测试
+// 压力测试
 func BenchmarkSolution(b *testing.B) {
 }
 
-//	使用案列
+// 使用案列
 func ExampleSolution() {
 }