//关于java的BufferReader输入的使用模板,可以自己添加到ide的模板库里面使用,就是没有Scanner的hasNext()方//法,有大佬可以帮忙写个封装么,这样就能写杭电别的关于hasNext的oj题了
//借鉴地址
//https://www.cpe.ku.ac.th/~jim/java-io.html

//输出
static PrintWriter out;

//输入类
static class FastReader {
    BufferedReader br;
    StringTokenizer st;

    public FastReader() {
        br = new BufferedReader(new InputStreamReader(System.in));
        out = new PrintWriter(System.out);
    }

    String next() {
        while (st == null || !st.hasMoreElements()) {
            try {
                st = new StringTokenizer(br.readLine());
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return st.nextToken();
    }

    int nextInt() {
        return Integer.parseInt(next());
    }

    long nextLong() {
        return Long.parseLong(next());
    }

    double nextDouble() {
        return Double.parseDouble(next());
    }

    BigInteger nextBigInteger() {return new BigInteger(next());}

    BigDecimal nextBigDecimal() {return new BigDecimal(next());}

    String nextLine() {
        String str = "";
        try {
            str = br.readLine();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return str;
    }
}

完整的模板

import java.math.*;
import java.util.*;
import java.lang.*;
import java.io.*;
import java.awt.*;


public class Main {
    static final int N = 100010;
    static int q[] = new int[N];

    //把解决方案放这里
    public static void solveCom() {
        FastReader sc = new FastReader();
        int n = sc.nextInt();


    } // solve fn ends

    public static void solveSub() {
        FastReader sc = new FastReader();
        int t = sc.nextInt();
        while (t-- > 0) {

        }


    } // solve fn ends

    public static void solveTrue() {
        FastReader sc = new FastReader();
        while (true) {

        }


    } // solve fn ends

    public static void solveScan() {
        Scanner sc = new Scanner(new BufferedInputStream(System.in));
        while (sc.hasNext()) {

        }

    }

    public static void main(String[] args) throws Exception {
        //调用solve方法,好处是有多个题解可以写n个solve方法
        solveCom();
//        solveSub();
//        solveTrue();
//        solveScan();

    }

    //输出
    static PrintWriter out;

    //输入类
    static class FastReader {
        BufferedReader br;
        StringTokenizer st;

        public FastReader() {
            br = new BufferedReader(new InputStreamReader(System.in));
            out = new PrintWriter(System.out);
        }

        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        BigInteger nextBigInteger() {return new BigInteger(next());}

        BigDecimal nextBigDecimal() {return new BigDecimal(next());}

        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    }
}