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

update md

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pull/6/head
yuanguangxin 5 years ago
parent a3277ce348
commit e90f60d5a8
10 changed files with 257 additions and 51 deletions
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117
.idea/workspace.xml
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@ -2,8 +2,17 @@
<project version="4">
<component name="ChangeListManager">
<list default="true" id="af7ffdf2-4ddc-4ed6-8222-60ed5acbc2ed" name="Default Changelist" comment="">
<change afterPath="$PROJECT_DIR$/src/q42/Solution.java" afterDir="false" />
<change afterPath="$PROJECT_DIR$/src/Interviewing.md" afterDir="false" />
<change afterPath="$PROJECT_DIR$/src/q10/Solution.java" afterDir="false" />
<change afterPath="$PROJECT_DIR$/src/q110/q2/Solution.java" afterDir="false" />
<change afterPath="$PROJECT_DIR$/src/q110/q2/TreeNode.java" afterDir="false" />
<change afterPath="$PROJECT_DIR$/src/q22/f1/Solution.java" afterDir="false" />
<change afterPath="$PROJECT_DIR$/src/q22/f2/Solution.java" afterDir="false" />
<change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
<change beforePath="$PROJECT_DIR$/Rocket.md" beforeDir="false" afterPath="$PROJECT_DIR$/Rocket.md" afterDir="false" />
<change beforePath="$PROJECT_DIR$/src/q110/Solution.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/q110/q1/Solution.java" afterDir="false" />
<change beforePath="$PROJECT_DIR$/src/q110/TreeNode.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/q110/q1/TreeNode.java" afterDir="false" />
<change beforePath="$PROJECT_DIR$/src/q94/Solution.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/q94/Solution.java" afterDir="false" />
</list>
<option name="SHOW_DIALOG" value="false" />
<option name="HIGHLIGHT_CONFLICTS" value="true" />
@ -66,11 +75,11 @@
</component>
<component name="RecentsManager">
<key name="CopyClassDialog.RECENTS_KEY">
<recent name="q110.q2" />
<recent name="q110" />
<recent name="q450" />
<recent name="q701" />
<recent name="q98.f3" />
<recent name="q98.f2" />
</key>
<key name="CopyFile.RECENT_KEYS">
<recent name="$PROJECT_DIR$/src/etc/q1" />
@ -78,13 +87,13 @@
<recent name="$PROJECT_DIR$/src/q206/f1" />
</key>
</component>
<component name="RunManager" selected="Application.Solution (4)">
<component name="RunManager" selected="Application.Solution (2)">
<configuration name="Solution (1)" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
<option name="MAIN_CLASS_NAME" value="q98.f3.Solution" />
<option name="MAIN_CLASS_NAME" value="q10.Solution" />
<module name="LeetCode" />
<extension name="coverage">
<pattern>
<option name="PATTERN" value="q98.f3.*" />
<option name="PATTERN" value="q10.*" />
<option name="ENABLED" value="true" />
</pattern>
</extension>
@ -93,11 +102,11 @@
</method>
</configuration>
<configuration name="Solution (2)" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
<option name="MAIN_CLASS_NAME" value="q110.Solution" />
<option name="MAIN_CLASS_NAME" value="q46.f1.Solution" />
<module name="LeetCode" />
<extension name="coverage">
<pattern>
<option name="PATTERN" value="q110.*" />
<option name="PATTERN" value="q46.f1.*" />
<option name="ENABLED" value="true" />
</pattern>
</extension>
@ -105,12 +114,12 @@
<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="q1277.Solution" />
<configuration name="Solution (4)" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
<option name="MAIN_CLASS_NAME" value="q42.Solution" />
<module name="LeetCode" />
<extension name="coverage">
<pattern>
<option name="PATTERN" value="q1277.*" />
<option name="PATTERN" value="q42.*" />
<option name="ENABLED" value="true" />
</pattern>
</extension>
@ -118,12 +127,12 @@
<option name="Make" enabled="true" />
</method>
</configuration>
<configuration name="Solution (4)" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
<option name="MAIN_CLASS_NAME" value="q42.Solution" />
<configuration name="Solution (5)" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
<option name="MAIN_CLASS_NAME" value="q746.Solution" />
<module name="LeetCode" />
<extension name="coverage">
<pattern>
<option name="PATTERN" value="q42.*" />
<option name="PATTERN" value="q746.*" />
<option name="ENABLED" value="true" />
</pattern>
</extension>
@ -132,11 +141,11 @@
</method>
</configuration>
<configuration name="Solution" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
<option name="MAIN_CLASS_NAME" value="q450.Solution" />
<option name="MAIN_CLASS_NAME" value="q22.f2.Solution" />
<module name="LeetCode" />
<extension name="coverage">
<pattern>
<option name="PATTERN" value="q450.*" />
<option name="PATTERN" value="q22.f2.*" />
<option name="ENABLED" value="true" />
</pattern>
</extension>
@ -172,11 +181,11 @@
</configuration>
<recent_temporary>
<list>
<item itemvalue="Application.Solution (4)" />
<item itemvalue="Application.Solution (3)" />
<item itemvalue="Application.Solution (2)" />
<item itemvalue="Application.Solution" />
<item itemvalue="Application.Solution (5)" />
<item itemvalue="Application.Solution (1)" />
<item itemvalue="Application.Solution (5)" />
</list>
</recent_temporary>
</component>
@ -217,7 +226,7 @@
<workItem from="1580044287086" duration="50376000" />
<workItem from="1580562331089" duration="8289000" />
<workItem from="1580626297484" duration="35811000" />
<workItem from="1581061282899" duration="47765000" />
<workItem from="1581061282899" duration="68429000" />
</task>
<task id="LOCAL-00001" summary="add q5/q7/q172">
<created>1580045439607</created>
@ -324,7 +333,14 @@
<option name="project" value="LOCAL" />
<updated>1581441609925</updated>
</task>
<option name="localTasksCounter" value="16" />
<task id="LOCAL-00016" summary="add q42">
<created>1581519773712</created>
<option name="number" value="00016" />
<option name="presentableId" value="LOCAL-00016" />
<option name="project" value="LOCAL" />
<updated>1581519773712</updated>
</task>
<option name="localTasksCounter" value="17" />
<servers />
</component>
<component name="TypeScriptGeneratedFilesManager">
@ -346,7 +362,8 @@
<MESSAGE value="update q98" />
<MESSAGE value="add q110/q450/q701" />
<MESSAGE value="add q1277" />
<option name="LAST_COMMIT_MESSAGE" value="add q1277" />
<MESSAGE value="add q42" />
<option name="LAST_COMMIT_MESSAGE" value="add q42" />
</component>
<component name="WindowStateProjectService">
<state x="320" y="115" key="#Inspections" timestamp="1581061018990">
@ -361,66 +378,70 @@
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1
Rocket.md
Unescape View File

@ -205,6 +205,7 @@ Read View判断行的可见性，创建一个新事务时，copy一份当前系
(4)where对null判断
(5)where不等于
(6)or操作有至少一个字段没有索引
(7)需要回表的查询结果集过大（超过配置的范围）
11. 数据库优化指南

60
src/q10/Solution.java
Unescape View File

@ -0,0 +1,60 @@
package q10;
public class Solution {
public boolean isMatch(String s, String p) {
int i = 0;
int j = 0;
while (i < s.length()) {
char sc = s.charAt(i);
if (j >= p.length()) {
return false;
}
char pc = p.charAt(j);
if (j + 1 < p.length()) {
if (p.charAt(j + 1) == '*') {
if (pc == '.') {
j+=2;
break;
} else if (pc == sc) {
while (i < s.length() && s.charAt(i) == pc) {
i++;
}
}
j += 2;
} else {
if ((sc == pc) || (pc == '.')) {
i++;
j++;
} else {
return false;
}
}
} else {
if ((sc == pc) || (pc == '.')) {
i++;
j++;
} else {
return false;
}
}
}
while (j < p.length()) {
if (p.charAt(j) == '*') {
j++;
} else {
if (j + 1 < p.length() && p.charAt(j) == '*') {
j += 2;
} else {
return false;
}
}
}
return true;
}
public static void main(String[] args) {
System.out.println(new Solution().isMatch("aaa", "a*a"));
}
}

4
src/q110/Solution.java → src/q110/q1/Solution.java
Unescape View File

@ -1,7 +1,7 @@
package q110;
package q110.q1;
/**
* 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)
* 从顶至底遍历 o(n^2)
*/
public class Solution {

2
src/q110/TreeNode.java → src/q110/q1/TreeNode.java
Unescape View File

@ -1,4 +1,4 @@
package q110;
package q110.q1;
public class TreeNode {
int val;

26
src/q110/q2/Solution.java
Unescape View File

@ -0,0 +1,26 @@
package q110.q2;
/**
* 从底至顶遍历 o(n)
*/
public class Solution {
public boolean isBalanced(TreeNode root) {
return depth(root) != -1;
}
private int depth(TreeNode root) {
if (root == null) {
return 0;
}
int left = depth(root.left);
if (left == -1) {
return -1;
}
int right = depth(root.right);
if (right == -1) {
return -1;
}
return Math.abs(left - right) < 2 ? Math.max(left, right) + 1 : -1;
}
}

11
src/q110/q2/TreeNode.java
Unescape View File

@ -0,0 +1,11 @@
package q110.q2;
public class TreeNode {
int val;
TreeNode left;
TreeNode right;
TreeNode(int x) {
val = x;
}
}

50
src/q22/f1/Solution.java
Unescape View File

@ -0,0 +1,50 @@
package q22.f1;
import java.util.*;
/**
* 暴力法 o(2^2n*n)
*/
public class Solution {
public boolean isValid(String s) {
Stack<Character> stack = new Stack<>();
for (int i = 0; i < s.length(); i++) {
char t = s.charAt(i);
if (t == '(') {
stack.push(t);
} else {
if (stack.empty() || stack.pop() != '(') {
return false;
}
}
}
return stack.empty();
}
public List<String> generateParenthesis(int n) {
List<String> rs = new ArrayList<>();
if (n < 1) {
return rs;
}
String root = "(";
rs.add(root);
for (int k = 0; k < 2 * n - 1; k++) {
List<String> tempList = new ArrayList<>();
for (int i = 0; i < rs.size(); i++) {
String temp = rs.get(i);
tempList.add(temp + "(");
tempList.add(temp + ")");
}
rs.clear();
rs.addAll(tempList);
}
rs.removeIf(s -> !isValid(s));
return rs;
}
public static void main(String[] args) {
new Solution().generateParenthesis(3);
}
}

34
src/q22/f2/Solution.java
Unescape View File

@ -0,0 +1,34 @@
package q22.f2;
import java.util.ArrayList;
import java.util.List;
/**
* 回溯法 o((4^n)/(n^1/2))
*/
public class Solution {
public List<String> generateParenthesis(int n) {
List<String> ans = new ArrayList();
backtrack(ans, "", 0, 0, n);
return ans;
}
public void backtrack(List<String> ans, String cur, int open, int close, int max) {
if (cur.length() == max * 2) {
ans.add(cur);
return;
}
if (open < max) {
backtrack(ans, cur + "(", open + 1, close, max);
}
if (close < open) {
backtrack(ans, cur + ")", open, close + 1, max);
}
}
public static void main(String[] args) {
System.out.println(new Solution().generateParenthesis(3));
}
}

3
src/q94/Solution.java
Unescape View File

@ -4,6 +4,9 @@ import java.util.ArrayList;
import java.util.List;
import java.util.Stack;
/**
* 非递归 o(n)
*/
public class Solution {
public List<Integer> inorderTraversal(TreeNode root) {
List<Integer> rs = new ArrayList<>();

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