msb-public-java
/
LeetCode
mirror of https://github.com/yuanguangxin/LeetCode
1
2
Code Issues Projects Releases Wiki Activity

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 @@
<?xml version="1.0" encoding="UTF-8"?> <?xml version="1.0" encoding="UTF-8"?>
<project version="4"> <project version="4">
<component name="ChangeListManager"> <component name="ChangeListManager">
<list default="true" id="af7ffdf2-4ddc-4ed6-8222-60ed5acbc2ed" name="Default Changelist" comment="add q94/98/144/145"> <list default="true" id="af7ffdf2-4ddc-4ed6-8222-60ed5acbc2ed" name="Default Changelist" comment="update q98">
<change afterPath="$PROJECT_DIR$/src/q98/f3/Solution.java" afterDir="false" /> <change afterPath="$PROJECT_DIR$/src/q110/Solution.java" afterDir="false" />
<change afterPath="$PROJECT_DIR$/src/q98/f3/TreeNode.java" afterDir="false" /> <change afterPath="$PROJECT_DIR$/src/q110/TreeNode.java" afterDir="false" />
<change afterPath="$PROJECT_DIR$/src/q450/Solution.java" afterDir="false" />
<change afterPath="$PROJECT_DIR$/src/q450/TreeNode.java" afterDir="false" />
<change afterPath="$PROJECT_DIR$/src/q701/Solution.java" afterDir="false" />
<change afterPath="$PROJECT_DIR$/src/q701/TreeNode.java" afterDir="false" />
<change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" /> <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
<change beforePath="$PROJECT_DIR$/src/q98/Solution.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/q98/f1/Solution.java" afterDir="false" />
<change beforePath="$PROJECT_DIR$/src/q98/TreeNode.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/q98/f1/TreeNode.java" afterDir="false" />
<change beforePath="$PROJECT_DIR$/src/q98/f2/Solution.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/q98/f2/Solution.java" afterDir="false" />
</list> </list>
<option name="SHOW_DIALOG" value="false" /> <option name="SHOW_DIALOG" value="false" />
<option name="HIGHLIGHT_CONFLICTS" value="true" /> <option name="HIGHLIGHT_CONFLICTS" value="true" />
@ -70,11 +71,11 @@
</component> </component>
<component name="RecentsManager"> <component name="RecentsManager">
<key name="CopyClassDialog.RECENTS_KEY"> <key name="CopyClassDialog.RECENTS_KEY">
<recent name="q110" />
<recent name="q450" />
<recent name="q701" />
<recent name="q98.f3" /> <recent name="q98.f3" />
<recent name="q98.f2" /> <recent name="q98.f2" />
<recent name="q145" />
<recent name="q94" />
<recent name="q144" />
</key> </key>
<key name="CopyFile.RECENT_KEYS"> <key name="CopyFile.RECENT_KEYS">
<recent name="$PROJECT_DIR$/src/etc/q1" /> <recent name="$PROJECT_DIR$/src/etc/q1" />
@ -82,7 +83,7 @@
<recent name="$PROJECT_DIR$/src/q206/f1" /> <recent name="$PROJECT_DIR$/src/q206/f1" />
</key> </key>
</component> </component>
<component name="RunManager" selected="Application.Solution (1)"> <component name="RunManager" selected="Application.Solution (2)">
<configuration name="Main" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true"> <configuration name="Main" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
<option name="MAIN_CLASS_NAME" value="etc.tree.traversal.Main" /> <option name="MAIN_CLASS_NAME" value="etc.tree.traversal.Main" />
<module name="LeetCode" /> <module name="LeetCode" />
@ -110,24 +111,11 @@
</method> </method>
</configuration> </configuration>
<configuration name="Solution (2)" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true"> <configuration name="Solution (2)" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
<option name="MAIN_CLASS_NAME" value="q101.f2.Solution" /> <option name="MAIN_CLASS_NAME" value="q110.Solution" />
<module name="LeetCode" /> <module name="LeetCode" />
<extension name="coverage"> <extension name="coverage">
<pattern> <pattern>
<option name="PATTERN" value="q101.f2.*" /> <option name="PATTERN" value="q110.*" />
<option name="ENABLED" value="true" />
</pattern>
</extension>
<method v="2">
<option name="Make" enabled="true" />
</method>
</configuration>
<configuration name="Solution (3)" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
<option name="MAIN_CLASS_NAME" value="q98.f2.Solution" />
<module name="LeetCode" />
<extension name="coverage">
<pattern>
<option name="PATTERN" value="q98.f2.*" />
<option name="ENABLED" value="true" /> <option name="ENABLED" value="true" />
</pattern> </pattern>
</extension> </extension>
@ -149,11 +137,11 @@
</method> </method>
</configuration> </configuration>
<configuration name="Solution" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true"> <configuration name="Solution" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
<option name="MAIN_CLASS_NAME" value="q98.f1.Solution" /> <option name="MAIN_CLASS_NAME" value="q450.Solution" />
<module name="LeetCode" /> <module name="LeetCode" />
<extension name="coverage"> <extension name="coverage">
<pattern> <pattern>
<option name="PATTERN" value="q98.f1.*" /> <option name="PATTERN" value="q450.*" />
<option name="ENABLED" value="true" /> <option name="ENABLED" value="true" />
</pattern> </pattern>
</extension> </extension>
@ -189,11 +177,11 @@
</configuration> </configuration>
<recent_temporary> <recent_temporary>
<list> <list>
<item itemvalue="Application.Solution (2)" />
<item itemvalue="Application.Solution" />
<item itemvalue="Application.Solution (1)" /> <item itemvalue="Application.Solution (1)" />
<item itemvalue="Application.Main" /> <item itemvalue="Application.Main" />
<item itemvalue="Application.Solution (4)" /> <item itemvalue="Application.Solution (4)" />
<item itemvalue="Application.Solution (1)" />
<item itemvalue="Application.Solution (3)" />
</list> </list>
</recent_temporary> </recent_temporary>
</component> </component>
@ -234,7 +222,7 @@
<workItem from="1580044287086" duration="50376000" /> <workItem from="1580044287086" duration="50376000" />
<workItem from="1580562331089" duration="8289000" /> <workItem from="1580562331089" duration="8289000" />
<workItem from="1580626297484" duration="35811000" /> <workItem from="1580626297484" duration="35811000" />
<workItem from="1581061282899" duration="19690000" /> <workItem from="1581061282899" duration="36747000" />
</task> </task>
<task id="LOCAL-00001" summary="add q5/q7/q172"> <task id="LOCAL-00001" summary="add q5/q7/q172">
<created>1580045439607</created> <created>1580045439607</created>
@ -320,7 +308,14 @@
<option name="project" value="LOCAL" /> <option name="project" value="LOCAL" />
<updated>1581102125245</updated> <updated>1581102125245</updated>
</task> </task>
<option name="localTasksCounter" value="13" /> <task id="LOCAL-00013" summary="update q98">
<created>1581156795852</created>
<option name="number" value="00013" />
<option name="presentableId" value="LOCAL-00013" />
<option name="project" value="LOCAL" />
<updated>1581156795852</updated>
</task>
<option name="localTasksCounter" value="14" />
<servers /> <servers />
</component> </component>
<component name="TypeScriptGeneratedFilesManager"> <component name="TypeScriptGeneratedFilesManager">
@ -339,7 +334,8 @@
<MESSAGE value="add q54" /> <MESSAGE value="add q54" />
<MESSAGE value="add q23/q101" /> <MESSAGE value="add q23/q101" />
<MESSAGE value="add q94/98/144/145" /> <MESSAGE value="add q94/98/144/145" />
<option name="LAST_COMMIT_MESSAGE" value="add q94/98/144/145" /> <MESSAGE value="update q98" />
<option name="LAST_COMMIT_MESSAGE" value="update q98" />
</component> </component>
<component name="WindowStateProjectService"> <component name="WindowStateProjectService">
<state x="320" y="115" key="#Inspections" timestamp="1581061018990"> <state x="320" y="115" key="#Inspections" timestamp="1581061018990">
@ -354,62 +350,62 @@
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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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