组件升级 & 面试题 (5)

Author: gdut-yy

README.md

@@ -38,14 +38,14 @@ OpenJDK Runtime Environment (build 21+35-2513)
 OpenJDK 64-Bit Server VM (build 21+35-2513, mixed mode, sharing)
 
 $ mvn -v
-Apache Maven 3.9.4 (dfbb324ad4a7c8fb0bf182e6d91b0ae20e3d2dd9)
-Maven home: D:\programs\apache-maven-3.9.4
-Java version: 21, vendor: Oracle Corporation, runtime: C:\Program Files\Java\jdk-21
+Apache Maven 3.9.9 (8e8579a9e76f7d015ee5ec7bfcdc97d260186937)
+Maven home: D:\programs\apache-maven-3.9.9
+Java version: 21, vendor: Oracle Corporation, runtime: D:\programs\jdk-21
 Default locale: zh_CN, platform encoding: UTF-8
 OS name: "windows 11", version: "10.0", arch: "amd64", family: "windows"
 
-IntelliJ IDEA 2023.2.2 (Community Edition)
-Build #IC-232.9921.47, built on September 13, 2023
+IntelliJ IDEA 2024.2.2 (Community Edition)
+Build #IC-242.22855.74, built on September 18, 2024
 ```
 
 ## Command 命令行

algo-core/pom.xml

@@ -12,7 +12,7 @@
     <artifactId>algo-core</artifactId>
 
     <properties>
-        <maven.compiler.source>17</maven.compiler.source>
-        <maven.compiler.target>17</maven.compiler.target>
+        <maven.compiler.source>21</maven.compiler.source>
+        <maven.compiler.target>21</maven.compiler.target>
     </properties>
 </project>

algo-core/src/main/java/template/BIT.java

@@ -0,0 +1,25 @@
+package template;
+
+public class BIT {
+    int n;
+    int[] tree;
+
+    public BIT(int n) {
+        this.n = n;
+        tree = new int[n + 1];
+    }
+
+    int lb(int x) {
+        return x & -x;
+    }
+
+    void add(int pos, int val) {
+        for (; pos <= n; pos += lb(pos)) tree[pos] += val;
+    }
+
+    int query(int pos) {
+        int ret = 0;
+        for (; pos > 0; pos -= lb(pos)) ret += tree[pos];
+        return ret;
+    }
+}

codeforces/codeforces-01/pom.xml

@@ -12,8 +12,8 @@
     <artifactId>codeforces-01</artifactId>
 
     <properties>
-        <maven.compiler.source>17</maven.compiler.source>
-        <maven.compiler.target>17</maven.compiler.target>
+        <maven.compiler.source>21</maven.compiler.source>
+        <maven.compiler.target>21</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
 

codeforces/codeforces-02/pom.xml

@@ -12,8 +12,8 @@
     <artifactId>codeforces-02</artifactId>
 
     <properties>
-        <maven.compiler.source>17</maven.compiler.source>
-        <maven.compiler.target>17</maven.compiler.target>
+        <maven.compiler.source>21</maven.compiler.source>
+        <maven.compiler.target>21</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
 

codeforces/codeforces-03/pom.xml

@@ -12,8 +12,8 @@
     <artifactId>codeforces-03</artifactId>
 
     <properties>
-        <maven.compiler.source>17</maven.compiler.source>
-        <maven.compiler.target>17</maven.compiler.target>
+        <maven.compiler.source>21</maven.compiler.source>
+        <maven.compiler.target>21</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
 

codeforces/codeforces-04/pom.xml

@@ -12,8 +12,8 @@
     <artifactId>codeforces-04</artifactId>
 
     <properties>
-        <maven.compiler.source>17</maven.compiler.source>
-        <maven.compiler.target>17</maven.compiler.target>
+        <maven.compiler.source>21</maven.compiler.source>
+        <maven.compiler.target>21</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
 

codeforces/codeforces-05/pom.xml

@@ -12,8 +12,8 @@
     <artifactId>codeforces-05</artifactId>
 
     <properties>
-        <maven.compiler.source>17</maven.compiler.source>
-        <maven.compiler.target>17</maven.compiler.target>
+        <maven.compiler.source>21</maven.compiler.source>
+        <maven.compiler.target>21</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
 

codeforces/codeforces-06/pom.xml

@@ -12,8 +12,8 @@
     <artifactId>codeforces-06</artifactId>
 
     <properties>
-        <maven.compiler.source>17</maven.compiler.source>
-        <maven.compiler.target>17</maven.compiler.target>
+        <maven.compiler.source>21</maven.compiler.source>
+        <maven.compiler.target>21</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
 

codeforces/codeforces-07/pom.xml

@@ -12,8 +12,8 @@
     <artifactId>codeforces-07</artifactId>
 
     <properties>
-        <maven.compiler.source>17</maven.compiler.source>
-        <maven.compiler.target>17</maven.compiler.target>
+        <maven.compiler.source>21</maven.compiler.source>
+        <maven.compiler.target>21</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>