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dichgrem
2025-10-30 14:30:50 +08:00
parent 3d166ec578
commit af1ea3e24e
21 changed files with 303 additions and 0 deletions
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7
com/study/demo/Demo.java Normal file
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package com.study.demo;
public class Demo {
public static void main(String [] args) {
System.out.println("HelloWorld!");
}
}

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com/study/demo/test1_1.java Normal file
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package com.study.demo;
import java.util.Scanner;
// I am 212306206
public class test1_type {
public static void main(String[] args) {
Scanner scanner = new Scanner (System.in);
int a = scanner.nextInt();
int b = scanner.nextInt();
int sum = a + b;
System.out.println(a + " + " + b + " = " + sum);
scanner.close();
}
}

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com/study/demo/test1_2.java Normal file
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package com.study.demo;
public class test2_for {
public static void main(String[] args) {
int[] numbers = new int[5];
for (int i = 0; i < numbers.length; i++) {
numbers[i] = i * 10;
}
System.out.print("数组内容: ");
for (int i = 0; i < numbers.length; i++) {
System.out.print(numbers[i] + " ");
}
}
}

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com/study/demo/test1_3.java Normal file
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package com.study.demo;
public class test3_1_99 {
public static void main(String[] args) {
int[] numbers = new int[99];
for (int i = 0; i < numbers.length; i++) {
numbers[i] = i + 1;
}
int sum = 0;
for (int i = 0; i < numbers.length; i++) {
sum += numbers[i];
}
System.out.println("1+2+...+99 的和 = " + sum);
}
}

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com/study/demo/test2_1.java Normal file
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package com.study.demo;
import java.util.Scanner;
public class test4 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
double r1 = sc.nextDouble();
double r2 = sc.nextDouble();
sc.close();
double R = 1 / (1 / r1 + 1 / r2);
System.out.printf("%.2f\n", R);
}
}

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com/study/demo/test2_2.java Normal file
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package com.study.demo;
import java.util.Scanner;
public class test5 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int a = scanner.nextInt();
int b = scanner.nextInt();
int c = scanner.nextInt();
double pi = 3.1415926535;
double area = a * b * c + a * c + (pi * c * c) / 4;
System.out.printf("%.3f\n", area / 10000);
}
}

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com/study/demo/test2_3.java Normal file
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package com.study.demo;
import java.util.Scanner;
public class test6 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int n = scanner.nextInt();
int result = 1 << n;
System.out.println(result);
}
}

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com/study/demo/test2_4.java Normal file
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package com.study.demo;
import java.util.Scanner;
public class test7 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int x = scanner.nextInt();
int y = scanner.nextInt();
int startYear = 2016, startMonth = 8;
int totalMonths = (x - startYear) * 12 + y - startMonth + 1;
System.out.println(totalMonths);
}
}

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com/study/demo/test2_5.java Normal file
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package com.study.demo;
import java.util.Scanner;
public class test8 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int x = scanner.nextInt();
int k = scanner.nextInt();
int a = x / 1000 % k;
int b = x / 100 % 10 % k;
int c = x / 10 % 10 % k;
int d = x % 10 % k;
System.out.print(a);
System.out.print(b);
System.out.print(c);
System.out.println(d);
}
}

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com/study/demo/test3_1.class Normal file
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com/study/demo/test3_1.java Normal file
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package com.study.demo;
import java.util.Scanner;
public class test3_1 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int n = scanner.nextInt();
int[] arr = new int[n];
for (int i = 0; i < n; i++) {
arr[i] = scanner.nextInt();
}
for (int i = 0; i < n / 2; i++) {
int temp = arr[i];
arr[i] = arr[n - 1 - i];
arr[n - 1 - i] = temp;
}
for (int i = 0; i < n; i++) {
System.out.print(arr[i] + (i == n - 1 ? "" : " "));
}
}
}

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com/study/demo/test3_2.class Normal file
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com/study/demo/test3_2.java Normal file
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package com.study.demo;
import java.util.Scanner;
public class test3_2 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int n = scanner.nextInt();
int[] a = new int[n];
int[] b = new int[n];
for (int i = 0; i < n; i++) {
a[i] = scanner.nextInt();
}
for (int i = 0; i < n; i++) {
b[i] = scanner.nextInt();
}
int sum = 0;
for (int i = 0; i < n; i++) {
sum += a[i] * b[i];
}
System.out.println(sum);
}
}

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com/study/demo/test3_3.class Normal file
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com/study/demo/test3_3.java Normal file
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package com.study.demo;
import java.util.Scanner;
public class test3_3 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int n = scanner.nextInt();
int[] arr = new int[n];
for (int i = 0; i < n; i++) {
arr[i] = scanner.nextInt();
}
int maxLen = 1, currentLen = 1;
for (int i = 1; i < n; i++) {
if (arr[i] == arr[i - 1]) {
currentLen++;
} else {
maxLen = Math.max(maxLen, currentLen);
currentLen = 1;
}
}
maxLen = Math.max(maxLen, currentLen);
System.out.println(maxLen);
}
}

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com/study/demo/test3_4.class Normal file
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com/study/demo/test3_4.java Normal file
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package com.study.demo;
import java.util.Scanner;
public class test3_4 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int n = scanner.nextInt();
int m = scanner.nextInt();
int[][] image = new int[n][m];
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
image[i][j] = scanner.nextInt();
}
}
for (int j = 0; j < m; j++) {
for (int i = n - 1; i >= 0; i--) {
System.out.print(image[i][j] + (i == 0 ? "" : " "));
}
System.out.println();
}
}
}

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com/study/demo/test3_5.class Normal file
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com/study/demo/test3_5.java Normal file
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package com.study.demo;
import java.util.Scanner;
public class test3_5 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int n = scanner.nextInt();
int[] t = new int[n - 1];
int[] s = new int[n];
for (int i = 0; i < n - 1; i++) {
t[i] = scanner.nextInt();
}
for (int i = 0; i < n; i++) {
s[i] = scanner.nextInt();
}
int x = scanner.nextInt();
int y = scanner.nextInt();
int total = 0;
if (x < y) {
for (int i = x - 1; i < y - 1; i++) {
total += s[i] + t[i];
}
total += s[y - 1];
} else {
for (int i = x - 1; i >= y; i--) {
total += s[i] + (i > 0 ? t[i - 1] : 0);
}
total += s[y - 1];
}
System.out.println(total);
}
}

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flake.lock generated Normal file
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{
"nodes": {
"nixpkgs": {
"locked": {
"lastModified": 1759070547,
"narHash": "sha256-JVZl8NaVRYb0+381nl7LvPE+A774/dRpif01FKLrYFQ=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "647e5c14cbd5067f44ac86b74f014962df460840",
"type": "github"
},
"original": {
"owner": "NixOS",
"ref": "nixpkgs-unstable",
"repo": "nixpkgs",
"type": "github"
}
},
"root": {
"inputs": {
"nixpkgs": "nixpkgs"
}
}
},
"root": "root",
"version": 7
}

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flake.nix Normal file
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{
description = "A Nix-flake-based development environment";
inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
outputs = { self, nixpkgs }:
let
supportedSystems = [ "x86_64-linux" "aarch64-linux" ];
forEachSupportedSystem = f: nixpkgs.lib.genAttrs supportedSystems (system: f {
pkgs = import nixpkgs { inherit self system; };
});
in
{
devShells = forEachSupportedSystem ({ pkgs }: {
default = pkgs.mkShell {
packages = with pkgs; [
jdk8
];
};
});
};
}