From d8801201ce08a83aad9ec99fea572b5afed7bb17 Mon Sep 17 00:00:00 2001
From: YDZ <ydz627@gmail.com>
Date: Mon, 29 Jul 2019 22:17:29 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=20problem=20684?=
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---
 .../684. Redundant Connection.go              | 18 +++++++
 .../684. Redundant Connection_test.go         | 47 +++++++++++++++++++
 2 files changed, 65 insertions(+)
 create mode 100644 Algorithms/0684. Redundant Connection/684. Redundant Connection.go
 create mode 100644 Algorithms/0684. Redundant Connection/684. Redundant Connection_test.go

diff --git a/Algorithms/0684. Redundant Connection/684. Redundant Connection.go b/Algorithms/0684. Redundant Connection/684. Redundant Connection.go
new file mode 100644
index 00000000..71ccfc4d
--- /dev/null
+++ b/Algorithms/0684. Redundant Connection/684. Redundant Connection.go	
@@ -0,0 +1,18 @@
+package leetcode
+
+func findRedundantConnection(edges [][]int) []int {
+	if len(edges) == 0 {
+		return []int{}
+	}
+	uf, res := UnionFind{}, []int{}
+	uf.init(len(edges) + 1)
+	for i := 0; i < len(edges); i++ {
+		if uf.find(edges[i][0]) != uf.find(edges[i][1]) {
+			uf.union(edges[i][0], edges[i][1])
+		} else {
+			res = append(res, edges[i][0])
+			res = append(res, edges[i][1])
+		}
+	}
+	return res
+}
diff --git a/Algorithms/0684. Redundant Connection/684. Redundant Connection_test.go b/Algorithms/0684. Redundant Connection/684. Redundant Connection_test.go
new file mode 100644
index 00000000..2e30735d
--- /dev/null
+++ b/Algorithms/0684. Redundant Connection/684. Redundant Connection_test.go	
@@ -0,0 +1,47 @@
+package leetcode
+
+import (
+	"fmt"
+	"testing"
+)
+
+type question684 struct {
+	para684
+	ans684
+}
+
+// para 是参数
+// one 代表第一个参数
+type para684 struct {
+	one [][]int
+}
+
+// ans 是答案
+// one 代表第一个答案
+type ans684 struct {
+	one []int
+}
+
+func Test_Problem684(t *testing.T) {
+
+	qs := []question684{
+
+		question684{
+			para684{[][]int{[]int{1, 2}, []int{1, 3}, []int{2, 3}}},
+			ans684{[]int{2, 3}},
+		},
+
+		question684{
+			para684{[][]int{[]int{1, 2}, []int{2, 3}, []int{3, 4}, []int{1, 4}, []int{1, 5}}},
+			ans684{[]int{1, 4}},
+		},
+	}
+
+	fmt.Printf("------------------------Leetcode Problem 684------------------------\n")
+
+	for _, q := range qs {
+		_, p := q.ans684, q.para684
+		fmt.Printf("【input】:%v       【output】:%v\n", p, findRedundantConnection(p.one))
+	}
+	fmt.Printf("\n\n\n")
+}