JAVA基础算法题

public class Main{
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        int N = sc.nextInt();
        int count=0;
        for(int i=1;i<=N;i++){
            double pow = Math.pow(i, 3);
            double sqrt = Math.sqrt(pow);
            if((int)sqrt==sqrt){
                count++;
            }
        }
        System.out.println(count++);
    }
}

public class Main {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        int N = sc.nextInt();
        int M=sc.nextInt();
        int count=0;
        sc.nextLine();
        int[] arr=new int[N];
        for(int i=0;i<N;i++){
            arr[i] = sc.nextInt();
        }
        for(int i=0;i<N;i++){
            for(int j=i+1;j<N;j++)
            if(arr[i]+arr[j]==M){
                count++;
            }
        }
        System.out.println(count);
    }
}

public class Main {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        int x = sc.nextInt();
        int y=sc.nextInt();
        //解二元一次方程组15*x + 10*y= 400   5*x + 10*y= 300
        int M=(x-y)/10;
        int N=(3*y-x)/20;
        if(M<0){
            System.out.print("不存在");
        }else{
            System.out.print(M+" ");
        }
        if(N<0){
            System.out.println("不存在");
        }
        else{
            System.out.println(N);
        }
    }
}

public class Main{
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        String str= sc.nextLine();
        String result="";
        for(int i=0;i<str.length();i++){
        int start=i;
        int end=str.length()-1;
        while(start<end) {
            if (str.charAt(start) == str.charAt(end)) {
                String newstr = str.substring(start, end+1);
                String substr = newstr.substring(1, newstr.length()-1);
                if (substr.contains(String.valueOf(newstr.charAt(0)))) {
                    start++;
                    break;
                } else {
                    result = result.length() > newstr.length() ? result : newstr;
                    break;
                }
            } else {
                end--;
            }
        }
        }
        System.out.println(result);
    }
    }

public class Main {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        int L = sc.nextInt();
        int Z=sc.nextInt();
        //解二元一次方程 x+3y=L   6x+4y=Z
        int x=(3*Z-4*L)/14;
        int y=(6*L-Z)/14;
        System.out.println(x+" "+y);
    }
}