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116.connect.cpp
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60 lines (50 loc) · 1.31 KB
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/*
// Definition for a Node.
class Node {
public:
int val;
Node* left;
Node* right;
Node* next;
Node() : val(0), left(NULL), right(NULL), next(NULL) {}
Node(int _val) : val(_val), left(NULL), right(NULL), next(NULL) {}
Node(int _val, Node* _left, Node* _right, Node* _next)
: val(_val), left(_left), right(_right), next(_next) {}
};
*/
class Solution {
public:
Node* connect(Node* root) {
if (root == NULL) return NULL;
queue<Node*> q;
queue<int> l;
q.push(root);
l.push(0);
Node* pre = NULL;
int preLevel = -1;
while(!q.empty()) {
Node* node = q.front();
q.pop();
int level = l.front();
l.pop();
if (pre != NULL) {
if (preLevel == level) {
pre->next = node;
}
if (preLevel != level) {
pre->next = NULL;
}
}
if (node->left != NULL) {
q.push(node->left);
l.push(level+1);
q.push(node->right);
l.push(level+1);
}
pre = node;
preLevel = level;
if (q.empty()) node->next = NULL;
}
return root;
}
};