feat: add solution to lc problem: No.0684

No.0684.Redundant Connection

Author: yanglbme

Diff for: solution/0600-0699/0684.Redundant Connection/README.md

@@ -207,14 +207,39 @@ func findRedundantConnection(edges [][]int) []int {
 	for _, e := range edges {
 		a, b := e[0], e[1]
 		if find(a) == find(b) {
-			return []int{a, b}
+			return e
 		}
 		p[find(a)] = find(b)
 	}
 	return []int{}
 }
 ```
 
+### **JavaScript**
+
+```js
+/**
+ * @param {number[][]} edges
+ * @return {number[]}
+ */
+var findRedundantConnection = function (edges) {
+    let p = Array.from({ length: 1010 }, (_, i) => i);
+    function find(x) {
+        if (p[x] != x) {
+            p[x] = find(p[x]);
+        }
+        return p[x];
+    }
+    for (let [a, b] of edges) {
+        if (find(a) == find(b)) {
+            return [a, b];
+        }
+        p[find(a)] = find(b);
+    }
+    return [];
+};
+```
+
 ### **...**
 
 ```

Diff for: solution/0600-0699/0684.Redundant Connection/README_EN.md

@@ -174,14 +174,39 @@ func findRedundantConnection(edges [][]int) []int {
 	for _, e := range edges {
 		a, b := e[0], e[1]
 		if find(a) == find(b) {
-			return []int{a, b}
+			return e
 		}
 		p[find(a)] = find(b)
 	}
 	return []int{}
 }
 ```
 
+### **JavaScript**
+
+```js
+/**
+ * @param {number[][]} edges
+ * @return {number[]}
+ */
+var findRedundantConnection = function (edges) {
+    let p = Array.from({ length: 1010 }, (_, i) => i);
+    function find(x) {
+        if (p[x] != x) {
+            p[x] = find(p[x]);
+        }
+        return p[x];
+    }
+    for (let [a, b] of edges) {
+        if (find(a) == find(b)) {
+            return [a, b];
+        }
+        p[find(a)] = find(b);
+    }
+    return [];
+};
+```
+
 ### **...**
 
 ```

Diff for: solution/0600-0699/0684.Redundant Connection/Solution.go

@@ -13,7 +13,7 @@ func findRedundantConnection(edges [][]int) []int {
 	for _, e := range edges {
 		a, b := e[0], e[1]
 		if find(a) == find(b) {
-			return []int{a, b}
+			return e
 		}
 		p[find(a)] = find(b)
 	}

Diff for: solution/0600-0699/0684.Redundant Connection/Solution.js

@@ -0,0 +1,20 @@
+/**
+ * @param {number[][]} edges
+ * @return {number[]}
+ */
+var findRedundantConnection = function (edges) {
+    let p = Array.from({ length: 1010 }, (_, i) => i);
+    function find(x) {
+        if (p[x] != x) {
+            p[x] = find(p[x]);
+        }
+        return p[x];
+    }
+    for (let [a, b] of edges) {
+        if (find(a) == find(b)) {
+            return [a, b];
+        }
+        p[find(a)] = find(b);
+    }
+    return [];
+};