vc6中c++代码问题如何解决

Question

#include "stdafx.h"

/**

• Definition for a binary tree node.
• struct TreeNode {
• int val;
• TreeNode *left;
• TreeNode *right;
• TreeNode(int x) : val(x), left(NULL), right(NULL) {}
• }; */

class Solution {
public:
int maxPathSum (TreeNode *root, int &val) {
if (root == nullptr) return 0;
int left = maxPathSum(root->left, val);
int right = maxPathSum(root->right, val);
int lmr = root->val + max(0, left) + max(0, right);
int ret = root->val + max(0, max(left, right));
val = max(val, max(lmr, ret));
return ret;

}

int maxPathSum(TreeNode* root)
{
int val = INT_MIN;
maxPathSum(root, val);
return val;
}

};

报错如下：

11.cpp
C:\code\11\11.cpp(16) : error C2061: syntax error : identifier 'TreeNode'
C:\code\11\11.cpp(26) : error C2061: syntax error : identifier 'TreeNode'
C:\code\11\11.cpp(27) : error C2535: 'int __thiscall Solution::maxPathSum(void)' : member function already defined or declared
C:\code\11\11.cpp(16) : see declaration of 'maxPathSum'

Answer 1

struct TreeNode {
int val;
TreeNode *left;
TreeNode *right;
TreeNode(int x) : val(x), left(NULL), right(NULL) {}
};
这个你都注释掉了，当然编译不通过

int maxPathSum(TreeNode* root)
->
int Solution::maxPathSum(TreeNode* root)