#15300 (Java21) No.120 傾向と対策：門松列（その１）

• 問題: No.120 傾向と対策：門松列（その１）
• ユーザー: t8m8⛄️
• 提出日時: 2015-03-12 20:05:27
• 言語: Java21 (openjdk 21)
• 結果: AC
• 実行時間: 208 ms / 5,000 ms
• コード長: 4,272 bytes
• コンパイル時間: 4,709 ms
• コンパイル使用メモリ: 80,632 KB
• 実行使用メモリ: 43,376 KB
• 最終ジャッジ日時: 2024-06-24 18:40:22
• 合計ジャッジ時間: 5,683 ms
• ジャッジサーバーID （参考情報）: judge1 / judge5

入力	結果	実行時間; 実行使用メモリ
testcase_00	AC	195 ms; 43,060 KB
testcase_01	AC	198 ms; 43,032 KB
testcase_02	AC	174 ms; 43,116 KB
testcase_03	AC	208 ms; 43,376 KB

ソースコード

//No.120 傾向と対策：門松列（その１）

import java.util.*;
import java.io.*;
import static java.util.Arrays.*;
import static java.lang.Math.*;

public class No120 {

    static final InputStream in = System.in;
    static final PrintWriter out = new PrintWriter(System.out,false);

    static void solve(){
        int t = nextInt();
        for (int d=0; d<t; d++) {
            int n = nextInt();
            HashMap<Integer,Integer> map = new HashMap<Integer,Integer>();
            PriorityQueue<Integer> pq = new PriorityQueue<Integer>(new Comparator<Integer>(){
                public int compare(Integer a, Integer b) { return b - a; }
            });
            for (int i=0; i<n; i++) {
                int l = nextInt();
                Integer a = map.get(l);
                map.put(l,a==null?1:a+1);
            }
            for (int key : map.keySet())
                pq.add(map.get(key));

            int cnt = 0;
            while (pq.size() >= 3) {
                cnt++;
                int a = pq.poll();
                int b = pq.poll();
                int c = pq.poll();
                if (a > 1) pq.add(--a);
                if (b > 1) pq.add(--b);
                if (c > 1) pq.add(--c);
            }
            out.println(cnt);
        }
    }

    public static void main(String[] args) throws Exception {
        long start = System.currentTimeMillis();

        solve();
        out.flush();

        long end = System.currentTimeMillis();
        //trace(end-start + "ms");
        in.close();
    }

    static void trace(Object... o) { System.out.println(deepToString(o));}

    static final byte[] buf = new byte[1024];
    static int ptr = 0;
    static int buflen = 0;

    static 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;
    }

    static int readByte() { if (hasNextByte()) return buf[ptr++]; else return -1;}

    static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}

    static void skip() { while(hasNextByte() && !isPrintableChar(buf[ptr])) ptr++;}

    static boolean hasNext() {skip(); return hasNextByte();}

    static 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();
    }

    static 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();
        }
    }

    static int nextInt() {
        long num = nextLong();
        if (num < Integer.MIN_VALUE || Integer.MAX_VALUE < num)
            throw new NumberFormatException();
        return (int)num;
    }

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

    static char nextChar() {
        if (!hasNext()) throw new NoSuchElementException();
        return (char)readByte();
    }

    static 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();
    }

    static int[] nextArrayInt(int n) {
        int[] a = new int[n];
        for (int i=0; i<n; i++) a[i] = nextInt();
        return a;
    }
}