msb-public-java
/
LeetCode
mirror of https://github.com/yuanguangxin/LeetCode
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add q110/q450/q701

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pull/6/head
yuanguangxin 5 years ago
parent 104f1ff5a1
commit d581ca1a4c
7 changed files with 237 additions and 62 deletions
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120
.idea/workspace.xml
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@ -1,13 +1,14 @@
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@ -82,7 +83,7 @@
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@ -110,24 +111,11 @@
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<option name="MAIN_CLASS_NAME" value="q101.f2.Solution" />
<option name="MAIN_CLASS_NAME" value="q110.Solution" />
<module name="LeetCode" />
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<configuration name="Solution (3)" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
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<module name="LeetCode" />
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@ -149,11 +137,11 @@
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<option name="MAIN_CLASS_NAME" value="q98.f1.Solution" />
<option name="MAIN_CLASS_NAME" value="q450.Solution" />
<module name="LeetCode" />
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@ -189,11 +177,11 @@
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41
src/q110/Solution.java
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@ -0,0 +1,41 @@
package q110;
/**
* o(n^2) 可修改getHeight()，在求树高后先判断是否平衡，将复杂度降为o(n)
*/
public class Solution {
public int getHeight(TreeNode root) {
if (root == null) {
return 0;
} else {
int lh = getHeight(root.left);
int rh = getHeight(root.right);
return Math.max(lh, rh) + 1;
}
}
public boolean isBalanced(TreeNode root) {
if (root == null) {
return true;
}
if (Math.abs(getHeight(root.left) - getHeight(root.right)) > 1) {
return false;
} else {
return isBalanced(root.left) && isBalanced(root.right);
}
}
public static void main(String[] args) {
TreeNode root = new TreeNode(3);
TreeNode n1 = new TreeNode(9);
TreeNode n2 = new TreeNode(20);
TreeNode n3 = new TreeNode(15);
TreeNode n4 = new TreeNode(7);
// root.left = n1;
root.right = n2;
n2.left = n3;
n2.right = n4;
System.out.println(new Solution().isBalanced(root));
}
}

11
src/q110/TreeNode.java
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@ -0,0 +1,11 @@
package q110;
public class TreeNode {
int val;
TreeNode left;
TreeNode right;
TreeNode(int x) {
val = x;
}
}

76
src/q450/Solution.java
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@ -0,0 +1,76 @@
package q450;
/**
* 用前驱节点代替待删除的节点 o(log(n))
*/
public class Solution {
public TreeNode deleteNode(TreeNode root, int key) {
if (root == null) {
return null;
}
if (key < root.val) {
root.left = deleteNode(root.left, key);
return root;
}
if (key > root.val) {
root.right = deleteNode(root.right, key);
return root;
}
if (root.left == null) {
return root.right;
}
if (root.right == null) {
return root.left;
}
//求前驱节点
TreeNode predecessor = maximum(root.left);
TreeNode predecessorCopy = new TreeNode(predecessor.val);
//先remove再衔接
predecessorCopy.left = removeMax(root.left);
predecessorCopy.right = root.right;
root.left = null;
root.right = null;
return predecessorCopy;
}
/**
* 两种情况，一种 node.right == null 说明前驱节点为删除节点的左节点，否则为删除节点的右侧叶节点（对应maximum(root.left)）
*
* @param node
* @return
*/
private TreeNode removeMax(TreeNode node) {
if (node.right == null) {
return node.left;
}
node.right = removeMax(node.right);
return node;
}
private TreeNode maximum(TreeNode node) {
if (node.right == null) {
return node;
}
return maximum(node.right);
}
public static void main(String[] args) {
TreeNode root = new TreeNode(1);
// TreeNode n1 = new TreeNode(3);
TreeNode n2 = new TreeNode(2);
// TreeNode n3 = new TreeNode(2);
// TreeNode n4 = new TreeNode(4);
// TreeNode n5 = new TreeNode(7);
//
// root.left = n1;
root.right = n2;
// n1.left = n3;
// n1.right = n4;
// n2.right = n5;
new Solution().deleteNode(root, 1);
}
}

11
src/q450/TreeNode.java
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@ -0,0 +1,11 @@
package q450;
public class TreeNode {
int val;
TreeNode left;
TreeNode right;
TreeNode(int x) {
val = x;
}
}

29
src/q701/Solution.java
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@ -0,0 +1,29 @@
package q701;
/**
* 递归（大于插入右子树，小于插入左子树） o(n)
*/
public class Solution {
public TreeNode insertIntoBST(TreeNode root, int val) {
TreeNode node = new TreeNode(val);
TreeNode temp = root;
if (root == null) {
return node;
}
if (val >= root.val) {
if (root.right == null) {
root.right = node;
} else {
insertIntoBST(root.right, val);
}
} else {
if (root.left == null) {
root.left = node;
} else {
insertIntoBST(root.left, val);
}
}
return temp;
}
}

11
src/q701/TreeNode.java
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@ -0,0 +1,11 @@
package q701;
public class TreeNode {
int val;
TreeNode left;
TreeNode right;
TreeNode(int x) {
val = x;
}
}
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