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Zig-Zag Level Order Traversal cpp solution #146

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Zig-Zag Level Order Traversal cpp solution #146

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36 changes: 36 additions & 0 deletions Zig-Zag Level Order Traversal
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Original file line number Diff line number Diff line change
@@ -0,0 +1,36 @@
vector<vector<int>> solve(TreeNode* root){
//CODE HERE
vector<vector<int>> ans;
queue<TreeNode*>q;
q.push(root);

int count =0;
if(root == NULL)
return ans;

while(1){
int size = q.size();
if(size == 0)
return ans;

vector<int>data;
count++ ;
while(size>0){
TreeNode* temp = q.front();
q.pop();

data.push_back(temp->val);
if(temp->left != NULL)
q.push(temp->left);
if(temp->right != NULL)
q.push(temp->right);
size--;

}
if(count%2==0)
reverse(data.begin(), data.end());
ans.push_back(data);
}
return ans;
}