Merge pull request #1593 from wang2jun/master

0100相同的树 增加 js 迭代法版本

problems/0100.相同的树.md

@@ -253,6 +253,28 @@ var isSameTree = function (p, q) {
     return isSameTree(p.left, q.left) && isSameTree(p.right, q.right);
 };
 ```
+> 迭代法
+
+```javascript
+var isSameTree = (p, q) => {
+    const queue = [{ p, q }];
+    // 这是用{ } 解决了null的问题！
+    while (queue.length) {
+        const cur = queue.shift();
+        if (cur.p == null && cur.q == null) continue;
+        if (cur.p == null || cur.q == null) return false;
+        if (cur.p.val != cur.q.val) return false;
+        queue.push({
+            p: cur.p.left,
+            q: cur.q.left
+        }, {
+            p: cur.p.right,
+            q: cur.q.right
+        });
+    }
+    return true;
+};
+```
 
 TypeScript: