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94.cpp
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65 lines (62 loc) · 1.5 KB
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//recursive method:
class Solution {
public:
void traverse(TreeNode* root,vector<int> &v){
if(root){
traverse(root->left,v);
v.push_back(root->val);
traverse(root->right,v);
}
}
vector<int> inorderTraversal(TreeNode* root) {
vector<int> v;
traverse(root,v);
return v;
}
};
//stack method:
class Solution{
public:
vector<int> inorderTraversal(TreeNode* root){
vector<int> v;
stack<TreeNode*> s;
auto curr=root;
while(curr || !s.empty( )){
while(curr){
s.push(curr);
curr=curr->left;
}
curr=s.top();
s.pop();
v.push_back(curr->val);
curr=curr->right;
}
return v;
}
};
//Morris Traversal:
class Solution{
public:
vector<int> inorderTraversal(TreeNode* root){
vector<int> v;
auto curr=root;
while(curr){
if(curr->left==NULL){
v.push_back(curr->val);
curr=curr->right;
}else{
auto pre=curr->left;
while(pre->right && pre->right!=curr) pre=pre->right;
if(!pre->right){
pre->right=curr;
curr=curr->left;
}else{
pre->right=NULL;
v.push_back(curr->val);
curr=curr->right;
}
}
}
return v;
}
};