【7-9 有重复的数据I (20 分)】【此题卡输入，需要自己写个输入挂】

参考一个博客的输入挂，先挂在此处，以备以后使用。

import java.io.*;
import java.util.*;
import java.math.*;
 
public class Main
{
 
    public static void main(String[] args)
    {
        InputReader in = new InputReader();
        PrintWriter out = new PrintWriter(System.out);
        
        
        
        out.close();
    }
}
class InputReader
{
    BufferedReader buf;
    StringTokenizer tok;
    InputReader()
    {
        buf = new BufferedReader(new InputStreamReader(System.in));
    }
    boolean hasNext()
    {
        while(tok == null || !tok.hasMoreElements()) 
        {
            try
            {
                tok = new StringTokenizer(buf.readLine());
            } 
            catch(Exception e) 
            {
                return false;
            }
        }
        return true;
    }
    String next()
    {
        if(hasNext()) return tok.nextToken();
        return null;
    }
    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());
    }
}

正确代码：

import java.io.*;
import java.util.*;
import java.math.*;
public class Main{
    public static void main(String[] args) {
        InputReader in = new InputReader();
        PrintWriter out = new PrintWriter(System.out);
        final int maxn = 100000+10;
        int[] vis = new int[maxn];
        int n = in.nextInt(), num, flag = 0;
        for(int i = 0; i < n; i++) {
            num = in.nextInt();
            if(vis[num] == 1)
                flag = 1;
            vis[num] = 1;
        }
        if(flag == 0)
            out.println("NO");
        else 
            out.println("YES");
        out.close();
    }
}

class InputReader{
    BufferedReader buf;
    StringTokenizer tok;
    InputReader(){
        buf = new BufferedReader(new InputStreamReader(System.in));
    }
    boolean hasNext() {
        while(tok == null || !tok.hasMoreElements()) {
            try {
                tok = new StringTokenizer(buf.readLine());
            }
            catch(Exception e) {
                return false;
            }
        }
        return true;
    }
    String next() {
        if(hasNext()) {
            return tok.nextToken();
        }
        return null;
    }
    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());
    }
}