目录:
- import java.util.*;
-
- public class Main {
- public static void main(String[] args) {
- Scanner scan = new Scanner(System.in);
- int year = scan.nextInt();
- String tiangan[] = {"geng","xin","ren","gui","jia","yi","bing","ding","wu","ji"};
- String dizhi[] = {"shen","you","xu","hai","zi","chou","yin","mao","chen","si","wu","wei"};
- System.out.println(tiangan[year%10] + dizhi[year%12]);
- scan.close();
- //40 40%12 = 4
- //0:gengshen
- }
- }
求出公元0年的天干地支年,重新排序
- import java.util.*;
-
- public class Main {
- public static void main(String[] args) {
- Scanner scan = new Scanner(System.in);
- int num = scan.nextInt();
- HashSet
studentSet = new HashSet<>(); -
- for(int i = 0; i < num; i++){
- int score = scan.nextInt();
- studentSet.add(score);
- }
- //将一个包含整数的HashSet(studentSet)转换为一个整数数组(studentArray)
- Integer[] studentArray = studentSet.toArray(new Integer[0]);
- Arrays.sort(studentArray);
-
- System.out.println(studentArray.length);
- for(int i = 0; i < studentArray.length; i++){
- System.out.print(studentArray[i] + " ");
- }
- }
- }
- import java.util.*;
-
- public class Main {
- public static void main(String[] args) {
- Scanner scan = new Scanner(System.in);
- String s = scan.next();
- String str = s.replace("-","");
- int sum = 0;
- for(int i =0;i<9;i++){
- sum += Integer.parseInt(str.charAt(i)+"") * (i+1);
- }
-
- if((sum%11<10 && sum%11==Integer.parseInt(str.charAt(9)+"")) || (sum%11==10&&str.charAt(9)=='X')){
- System.out.println("Right");
- }else{
- if(sum%11<10){
- System.out.println(s.substring(0,12)+sum%11);
- }else if(sum%11==10){
- System.out.println(s.substring(0,12)+"X");
- }
- }
- scan.close();
- }
- }
在Java中,
charAt()
方法返回的是一个字符类型。当你需要将字符转换为可以被Integer.parseInt()
处理的字符串时,需要将其转换为字符串类型。虽然字符本身可以隐式地转换为字符串,但在实际编程中,直接写成str.charAt(i) + ""
的形式是为了增加代码的可读性,明确表示你想要将字符转换为字符串。这里的
(str.charAt(i) + "")
相当于显式地将字符转换为了长度为1的字符串。在本例中,由于Integer.parseInt()
需要接收一个代表整数的字符串作为参数,因此这样的转换是必要的。
- import java.math.BigInteger;
- import java.util.Scanner;
-
- public class Main {
- public static void main(String[] args) {
- Scanner scan = new Scanner(System.in);
- BigInteger num = scan.nextBigInteger();
- while(num.compareTo(BigInteger.valueOf(9)) > 0){
- num = num.mod(BigInteger.TEN).add(num.divide(BigInteger.TEN));
- }
- System.out.println(num);
- scan.close();
- }
- }
- import java.util.*;
-
- public class Main {
- public static void main(String[] args) {
- int count = 0;
- for(int i =1;;i++){
- if(check(i,2)==0 && check(i,8)==0 && check(i,10)==0 && check(i,16)==0){
- count++;
- }
- if(count == 2023){
- System.out.println(i);
- break;
- }
- }
- }
-
- public static int check(int i,int jinzhi){
- int temp = i;
- int he = 0;
- while(i > 0){
- he += i % jinzhi;
- i = i / jinzhi;
- }
- return temp % he;
- }
- }
- import java.util.Scanner;
-
- public class Main{
- public static void main(String[] args) {
- Scanner scanner = new Scanner(System.in);
- String s = scanner.nextLine();
- //将一个字符串按照指定的分隔符拆分成字符串数组
- //表示匹配一个或多个空白字符(包括空格、制表符、换行符等)
- String str[] = s.split("\\s+");
- for (int i = 0; i < str.length; i++) {
- //将当前字符串 str[i] 的第一个字符转换为大写并将剩余部分连接起来
- str[i] = str[i].substring(0, 1).toUpperCase() + str[i].substring(1);
- str[i] = str[i].replaceAll("(\\d)([a-zA-Z])", "$1_$2");
- str[i] = str[i].replaceAll("([a-zA-Z])(\\d)", "$1_$2");
- System.out.print(str[i] + " ");
- }
- }
- }
(\\d)
:匹配一个数字,并将其捕获到组1中。([a-zA-Z])
:匹配一个字母,并将其捕获到组2中。替换字符串是
"$1_$2"
,其中$1
和$2
是反向引用,分别代表匹配到的第一个和第二个捕获组的内容。所以这个操作会查找数字紧接着字母的情况,并在它们之间插入一个下划线。例如,如果str[i] = "3apple"
,经过这个操作后,结果变为"3_apple"
。
- import java.util.Scanner;
-
- public class Main {
- public static void main(String[] args) {
- Scanner scan = new Scanner(System.in);
- int num = scan.nextInt();
- int arr[] = new int[num];
- for(int i = 0;i
- arr[i] = scan.nextInt();
- }
-
- int result = 0;
- int count = 1;
- for (int i = 1; i < num; i++) {
- if(arr[i] > arr[i-1]){
- count++;
- result = result>count ? result:count;
- }else{
- count = 1;
- }
- }
- System.out.println(result);
- scan.close();
- }
- }
8. 灌溉
- import java.util.Scanner;
-
- public class Main {
- public static void main(String[] args) {
- Scanner scan = new Scanner(System.in);
- int n = scan.nextInt();
- int m = scan.nextInt();
- int count1 = scan.nextInt();
- int arr[][] = new int[n][m];
- for(int i = 0;i
- arr[scan.nextInt()-1][scan.nextInt()-1] = 1;
- }
- int k = scan.nextInt();
-
- int count = 1;
- for(int i = 0;i
- count ++;
- for(int hang = 0;hang
- for (int lie = 0;lie
- if(arr[hang][lie] == count-1){
- if(hang -1 >= 0){
- arr[hang-1][lie] = count;
- }
- if(hang +1 < n){
- arr[hang+1][lie] = count;
- }
- if(lie - 1 >= 0){
- arr[hang][lie-1] = count;
- }
- if(lie+1 < m){
- arr[hang][lie+1] = count;
- }
- }
- }
- }
- }
-
- int num = 0;
- for(int i =0;i
- for(int j = 0;j
- if(arr[i][j] > 0){
- num ++;
- }
- }
- }
- System.out.println(num);
- scan.close();
- }
- }
9. 特殊日期
- import java.util.Scanner;
-
- public class Main {
- public static void main(String[] args) {
- int year = 1900;
- int day = 1;
- int month = 1;
- int months[] = {0,31,28,31,30,31,30,31,31,30,31,30,31};
-
- int count = 0;
- while(true){
- if((year%4 == 0 && year%100 != 0) || year%400 == 0){
- months[2] = 29;
- }else{
- months[2] = 28;
- }
- if(year/1000 + year/100%10 + year/10%10 + year%10 == month/10 + month%10 + day/10 + day%10){
- count++;
- }
- day++;
- if(day>months[month]){
- day = 1;
- month++;
- if(month>12){
- month = 1;
- year++;
- }
- }
-
- if(year==9999 && month==12 && day==31){
- break;
- }
- }
- System.out.println(count);
- }
-
-
- }
10. 最大距离
- import java.util.*;
-
- public class Main {
- public static void main(String[] args) {
- Scanner scan = new Scanner(System.in);
- int num = scan.nextInt();
- int arr[] = new int[num];
- for(int i = 0;i
- arr[i] = scan.nextInt();
- }
- int max = 0;
- for(int i = 0;i
- for(int j = i+1;j
- int b = Math.abs(i - j) + Math.abs(arr[i] - arr[j]);
- if(b > max){
- max = b;
- }
- }
- }
- System.out.println(max);
- scan.close();
- }
- }
-
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-
原文地址:https://blog.csdn.net/weixin_72151610/article/details/136350671