java:无法访问org.springframework.boot.SpringApplication的解决方法

#include<iostream>
using namespace std;

const int N = 100010;
int n, m;
int p[N];

int find(int x)                 // 找到x的祖先节点
{
    if (p[x] != x) p[x] = find(p[x]);
    return p[x];
}

int main()
{
    scanf("%d %d", &n, &m);
    for (int i = 1; i <= n; ++i) p[i] = i;
    
    while (m--)
    {
        char op;
        int a, b;
        scanf (" %c%d%d", &op, &a, &b);
        if (op == 'M') p[p[find(a)]] = find(b);        // 让a的祖先节点指向b的祖先节点
        else
        {
            if (find(a) == find(b)) puts("Yes");
            else puts("No");
        }
    }
    return 0;
}

import java.io.*;

public class Main
{
    static int N = 100010;
    static int n, m;
    static int [] p = new int [N];
    
    static int find(int x)
    {
        if (p[x] != x) p[x] = find(p[x]);
        return p[x];
    }
    
    public static void main(String[] args) throws IOException
    {
        BufferedReader reader = new BufferedReader(new InputStreamReader (System.in));   
        String [] str = reader.readLine().split(" ");
        n = Integer.parseInt(str[0]);
        m = Integer.parseInt(str[1]);
        
        for (int i = 1; i <= n; ++ i) p[i] = i;
        while (m -- > 0)
        {
            String op;
            int a, b;
            str = reader.readLine().split(" ");
            op = str[0];
            a = Integer.parseInt(str[1]);
            b = Integer.parseInt(str[2]);
            if (op.equals("M")) p[find(a)] = find(b);
            else 
            {
                if (find(a) == find(b)) System.out.println("Yes");
                else System.out.println("No");
            }
        }
    }
}