Add solution and test-cases for problem 1791

Author: 0xff-dev

leetcode/1701-1800/1791.Find-Center-of-Star-Graph/README.md

@@ -1,28 +1,26 @@
 # [1791.Find Center of Star Graph][title]
 
-> [!WARNING|style:flat]
-> This question is temporarily unanswered if you have good ideas. Welcome to [Create Pull Request PR](https://github.com/kylesliu/awesome-golang-algorithm)
-
 ## Description
+There is an undirected **star** graph consisting of `n` nodes labeled from `1` to `n`. A star graph is a graph where there is one **center** node and **exactly** `n - 1` edges that connect the center node with every other node.
+
+You are given a 2D integer array `edges` where each `edges[i] = [ui, vi]` indicates that there is an edge between the nodes `ui` and `vi`. Return the center of the given star graph.
+
+**Example 1:**  
 
-**Example 1:**
+![1](./star_graph.png)
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: edges = [[1,2],[2,3],[4,2]]
+Output: 2
+Explanation: As shown in the figure above, node 2 is connected to every other node, so 2 is the center.
 ```
 
-## 题意
-> ...
+**Example 2:**
 
-## 题解
-
-### 思路1
-> ...
-Find Center of Star Graph
-```go
 ```
-
+Input: edges = [[1,2],[5,1],[1,3],[1,4]]
+Output: 1
+```
 
 ## 结语
 

leetcode/1701-1800/1791.Find-Center-of-Star-Graph/Solution.go

@@ -1,5 +1,12 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func Solution(edges [][]int) int {
+	a, b := edges[0], edges[1]
+	if a[0] == b[1] || a[0] == b[0] {
+		return a[0]
+	}
+	if a[1] == b[1] || a[1] == b[0] {
+		return a[1]
+	}
+	return -1
 }

leetcode/1701-1800/1791.Find-Center-of-Star-Graph/Solution_test.go

@@ -10,12 +10,11 @@ func TestSolution(t *testing.T) {
 	//	测试用例
 	cases := []struct {
 		name   string
-		inputs bool
-		expect bool
+		inputs [][]int
+		expect int
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", [][]int{{1, 2}, {2, 3}, {4, 2}}, 2},
+		{"TestCase2", [][]int{{1, 2}, {5, 1}, {1, 3}, {1, 4}}, 1},
 	}
 
 	//	开始测试
@@ -30,10 +29,10 @@ func TestSolution(t *testing.T) {
 	}
 }
 
-//	压力测试
+// 压力测试
 func BenchmarkSolution(b *testing.B) {
 }
 
-//	使用案列
+// 使用案列
 func ExampleSolution() {
 }