-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathtree2str.cpp
More file actions
72 lines (60 loc) · 1.46 KB
/
Copy pathtree2str.cpp
File metadata and controls
72 lines (60 loc) · 1.46 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
#include <string>
#define method1 1
#define method2 0
#define method3 0
class TreeNode
{
public:
int val;
TreeNode *left, *right;
TreeNode(int val)
{
this->val = val;
this->left = this->right = NULL;
}
};
class Solution
{
public:
#if method1
std::string tree2str(TreeNode *t)
{
if(!t) return "";
std::string res = "";
helper(t, res);
return std::string(res.begin() + 1, res.end() - 1);
}
void helper(TreeNode *t, std::string &res)
{
if(!t) return;
res += "(" + to_string(t->val);
if(!t->left && t->right) res += "()";
helper(t->left, res);
helper(t->right, res);
res += ")";
}
#endif
#if method2
std::string tree2str(TreeNode *t)
{
if(!t) return "";
std::string res = to_string(t->val);
std::string left = tree2str(t->left), right = tree2str(t->right);
if(left == "" && right == "") return res;
if(left == "") return res + "()" + "(" + right + ")";
if(right == "") return res + "(" + left + ")";
return res + "(" + left + ")" + "(" + right + ")";
}
#endif
#if method3
std::string tree2str(TreeNode *t)
{
if(!t) return "";
std::string res = to_string(t->val);
if(!t->left && !t->right) return res;
res += "(" + tree2str(t->left) + ")";
if(t->right) res += "(" + tree2str(t->right) + ")";
return res;
}
#endif
};