动态字符串

Java 解法, 执行用时: 10ms, 内存消耗: 9592KB, 提交时间: 2022-07-30

import java.util.Scanner;
import java.io.*;

public class Main {
    public static void main(String[] args) throws IOException{
         /*
         Scanner scanner = new Scanner(System.in);
         String str = scanner.next();

        //write your code here......
        int cnt=0;
        if(str.length()%3!=0){
            for(int i=0;i<str.length()%3;i++){
                System.out.print(str.charAt(i));
            }
        }
        System.out.print(",");
        for(int i=str.length()%3;i<str.length();i++){
            System.out.print(str.charAt(i));
            cnt++;
            if(cnt==3&&i!=str.length()-1){
                cnt=0;
                System.out.print(",");
            }
        }
        */
        
        
        
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String str = br.readLine();
        StringBuilder sb = new StringBuilder(str);
        int cnt=0;
        for(int i =sb.length()-1;i>=0;i--){
            cnt++;
            if(cnt==3){
                cnt=0;
                sb.insert(i,',');
            }
        }
        System.out.print(sb);

    }
}

Java 解法, 执行用时: 12ms, 内存消耗: 9344KB, 提交时间: 2022-06-28

import java.util.Scanner;
import java.io.InputStreamReader;
import java.io.BufferedReader;
import java.io.IOException;
public class Main {
    public static void main(String[] args)throws IOException {
      
        //write your code here......
        BufferedReader a=new BufferedReader(new InputStreamReader(System.in));
        StringBuilder b=new StringBuilder(a.readLine());
        for(int i=b.length()-3;i>=0;i-=3){
            b.insert(i,",");
        }
        System.out.println(b);
        
        
        
  
    }
}

Java 解法, 执行用时: 12ms, 内存消耗: 9404KB, 提交时间: 2022-04-29

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
    public static void main(String[] args)throws IOException {
       BufferedReader a=new BufferedReader(new InputStreamReader(System.in));
        StringBuilder b=new StringBuilder(a.readLine());       
        for(int i=b.length()-3;i>=0;i-=3){
                b.insert(i,",");          
        }       
        System.out.println(b);
    }
}

Java 解法, 执行用时: 12ms, 内存消耗: 9408KB, 提交时间: 2022-04-08

import java.util.Scanner;
import java.io.*;
public class Main {
    public static void main(String[] args)throws IOException {
       BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        StringBuilder sb=new StringBuilder(br.readLine());
        
        for(int i=sb.length()-3;i>=0;i-=3){
           
                sb.insert(i,",");
           
        }
       
        System.out.println(sb);
        //write your code here......
        

    }
}

Java 解法, 执行用时: 12ms, 内存消耗: 9440KB, 提交时间: 2022-08-02

import java.util.Scanner;
import java.io.*;

public class Main {
    public static void main(String[] args) throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String str = br.readLine();
        StringBuilder sb = new StringBuilder(str);
        int cnt=0;
        for(int i =sb.length()-1;i>=0;i--){
            cnt++;
            if(cnt==3){
                cnt=0;
                sb.insert(i,',');
            }
        }
        System.out.print(sb);

    }
}

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