Merge pull request youngyangyang04#754 from fengwei2002/patch-1

纠错 这里不需要声明 vector<int> vec

Author: youngyangyang04

problems/0102.二叉树的层序遍历.md

@@ -1173,7 +1173,7 @@ public:
         if (root != NULL) que.push(root);
         while (!que.empty()) {
             int size = que.size();
-            vector<int> vec;
+            // vector<int> vec;
             Node* nodePre;
             Node* node;
             for (int i = 0; i < size; i++) {