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431.cpp
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431.cpp
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class Codec {
public:
// Encodes an n-ary tree to a binary tree.
TreeNode* encode(Node* root) {
if (!root) return NULL;
TreeNode *res = new TreeNode(root->val);
if (!root->children.empty()) {
res->left = encode(root->children[0]);
}
TreeNode *cur = res->left;
for (int i = 1; i < root->children.size(); ++i) {
cur->right = encode(root->children[i]);
cur = cur->right;
}
return res;
}
// Decodes your binary tree to an n-ary tree.
Node* decode(TreeNode* root) {
if (!root) return NULL;
Node *res = new Node(root->val, {});
TreeNode *cur = root->left;
while (cur) {
res->children.push_back(decode(cur));
cur = cur->right;
}
return res;
}
};
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