結果
| 問題 | No.29 パワーアップ | 
| コンテスト | |
| ユーザー |  amyu | 
| 提出日時 | 2015-12-03 04:31:59 | 
| 言語 | Java (openjdk 23) | 
| 結果 | 
                                AC
                                 
                             | 
| 実行時間 | 59 ms / 5,000 ms | 
| コード長 | 3,801 bytes | 
| コンパイル時間 | 2,629 ms | 
| コンパイル使用メモリ | 80,712 KB | 
| 実行使用メモリ | 43,584 KB | 
| 最終ジャッジ日時 | 2025-10-24 20:55:11 | 
| 合計ジャッジ時間 | 4,417 ms | 
| ジャッジサーバーID (参考情報) | judge1 / judge4 | 
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| ファイルパターン | 結果 | 
|---|---|
| other | AC * 22 | 
ソースコード
import java.util.*;
import java.io.*;
public class Main{
    static final Reader sc = new Reader();
    static final PrintWriter out = new PrintWriter(System.out,false);
    public static void main(String[] args) throws Exception {
    	int n = sc.nextInt();
    	int[] item = new int[11];
    	for(int i=0;i<n;i++){
    		for(int j=0;j<3;j++){
	    		item[sc.nextInt()]++;
	    	}
    	}
    	int count = 0;
    	for(int i=1;i<11;i++){
    		while(item[i]>1){
    			item[i] -= 2;
    			count++;
    		}
    	}
    	int x = 0;
    	for(int i=1;i<11;i++){
    		x += item[i];
    	}
    	count += x/4;
    	out.println(count);
    	out.flush();
        sc.close();
        out.close();
    }
    static void trace(Object... o) { System.out.println(Arrays.deepToString(o));}
}
class Reader {
    private final InputStream in;
    private final byte[] buf = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;
    public Reader() { this(System.in);}
    public Reader(InputStream source) { this.in = source;}
    private boolean hasNextByte() {
        if (ptr < buflen) return true;
        ptr = 0;
        try{
            buflen = in.read(buf);
        }catch (IOException e) {e.printStackTrace();}
        if (buflen <= 0) return false;
        return true;
    }
    private int readByte() { if (hasNextByte()) return buf[ptr++]; else return -1;}
    private boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
    private void skip() { while(hasNextByte() && !isPrintableChar(buf[ptr])) ptr++;}
    public boolean hasNext() {skip(); return hasNextByte();}
    public String next() {
        if (!hasNext()) throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while (isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
    public long nextLong() {
        if (!hasNext()) throw new NoSuchElementException();
        boolean minus = false;
        long num = readByte();
        if(num == '-'){
            num = 0;
            minus = true;
        }else if (num < '0' || '9' < num){
            throw new NumberFormatException();
        }else{
            num -= '0';
        }
        while(true){
            int b = readByte();
            if('0' <= b && b <= '9')
                num = num * 10 + (b - '0');
            else if(b == -1 || !isPrintableChar(b))
                return minus ? -num : num;
            else
                throw new NoSuchElementException();
        }
    }
    public int nextInt() {
        long num = nextLong();
        if (num < Integer.MIN_VALUE || Integer.MAX_VALUE < num)
            throw new NumberFormatException();
        return (int)num;
    }
    public double nextDouble() {
        return Double.parseDouble(next());
    }
    public char nextChar() {
        if (!hasNext()) throw new NoSuchElementException();
        return (char)readByte();
    }
    public String nextLine() {
        while (hasNextByte() && (buf[ptr] == '\n' || buf[ptr] == '\r')) ptr++;
        if (!hasNextByte()) throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while (b != '\n' && b != '\r') {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
    public int[] nextIntArray(int n) {
        int[] res = new int[n];
        for (int i=0; i<n; i++) res[i] = nextInt();
        return res;
    }
    public char[] nextCharArray(int n) {
        char[] res = new char[n];
        for (int i=0; i<n; i++) res[i] = nextChar();
        return res;
    }
    public void close() {try{ in.close();}catch(IOException e){ e.printStackTrace();}};
}
            
            
            
        