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Update 算法模板.md 

将深度优先遍历（递归）的第三项前序遍历改为后序遍历
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Know More 2021-05-27 08:57:42 +08:00 committed by GitHub
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@ -82,13 +82,13 @@ void traversal(TreeNode* cur, vector<int>& vec) {
traversal(cur->right, vec); // 右 traversal(cur->right, vec); // 右
} }
``` ```
前序遍历（中左右） 后序遍历（左右中）
``` ```
void traversal(TreeNode* cur, vector<int>& vec) { void traversal(TreeNode* cur, vector<int>& vec) {
if (cur == NULL) return; if (cur == NULL) return;
vec.push_back(cur->val); // 中 ，同时也是处理节点逻辑的地方
traversal(cur->left, vec); // 左 traversal(cur->left, vec); // 左
traversal(cur->right, vec); // 右 traversal(cur->right, vec); // 右
vec.push_back(cur->val); // 中 ，同时也是处理节点逻辑的地方
} }
``` ```