結果

問題 No.921 ずんだアロー
ユーザー uwiuwi
提出日時 2019-11-08 22:10:28
言語 Java21
(openjdk 21)
結果
AC  
実行時間 108 ms / 2,000 ms
コード長 3,677 bytes
コンパイル時間 3,947 ms
コンパイル使用メモリ 84,476 KB
実行使用メモリ 42,632 KB
最終ジャッジ日時 2024-09-15 01:31:41
合計ジャッジ時間 7,010 ms
ジャッジサーバーID
（参考情報） 		judge3 / judge2
このコードへのチャレンジ
（要ログイン）

テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 52 ms
36,624 KB
testcase_01 AC 51 ms
36,792 KB
testcase_02 AC 52 ms
36,920 KB
testcase_03 AC 52 ms
36,856 KB
testcase_04 AC 49 ms
36,784 KB
testcase_05 AC 51 ms
36,792 KB
testcase_06 AC 51 ms
36,524 KB
testcase_07 AC 50 ms
36,640 KB
testcase_08 AC 50 ms
36,724 KB
testcase_09 AC 50 ms
36,776 KB
testcase_10 AC 106 ms
42,504 KB
testcase_11 AC 108 ms
42,632 KB
testcase_12 AC 75 ms
38,880 KB
testcase_13 AC 102 ms
40,968 KB
testcase_14 AC 102 ms
41,792 KB
testcase_15 AC 94 ms
40,204 KB
testcase_16 AC 59 ms
36,700 KB
testcase_17 AC 103 ms
41,800 KB
testcase_18 AC 97 ms
39,040 KB
testcase_19 AC 97 ms
38,840 KB
testcase_20 AC 96 ms
39,172 KB
testcase_21 AC 96 ms
38,948 KB
testcase_22 AC 94 ms
38,936 KB
testcase_23 AC 105 ms
42,472 KB
testcase_24 AC 97 ms
39,124 KB
権限があれば一括ダウンロードができます

ソースコード

diff # 

package contest191108;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.InputMismatchException;

public class B {
	InputStream is;
	PrintWriter out;
	String INPUT = "";
	
	void solve()
	{
		int n = ni();
		int[] a = na(n);
		int[] b = uniqcountOnly(a);
		long[] dp = new long[] {0L, -999999999L};
		for(int i = 0;i < b.length;i++) {
			long[] ndp = new long[2];
			Arrays.fill(ndp, -99999999L);
			ndp[0] = Math.max(dp[0] + Math.max(0, b[i]-1), dp[1] + Math.max(0, b[i]-2));
			ndp[1] = Math.max(dp[0] + b[i], dp[1] + b[i]-1);
			dp = ndp;
		}
		out.println(Math.max(dp[0], dp[1]));
	}
	
	public static int[] uniqcountOnly(int[] a)
	{
		int n = a.length;
		int p = 0;
		int[] b = new int[n];
		int prev = Integer.MIN_VALUE;
		for(int i = 0;i < n;i++){
			if(i == 0 || a[i] != prev)p++;
			b[p-1]++;
			prev = a[i];
		}
		return Arrays.copyOf(b, p);
	}

	
	void run() throws Exception
	{
		is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(INPUT.getBytes());
		out = new PrintWriter(System.out);
		
		long s = System.currentTimeMillis();
		solve();
		out.flush();
		if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms");
//		Thread t = new Thread(null, null, "~", Runtime.getRuntime().maxMemory()){
//			@Override
//			public void run() {
//				long s = System.currentTimeMillis();
//				solve();
//				out.flush();
//				if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms");
//			}
//		};
//		t.start();
//		t.join();
	}
	
	public static void main(String[] args) throws Exception { new B().run(); }
	
	private byte[] inbuf = new byte[1024];
	public int lenbuf = 0, ptrbuf = 0;
	
	private int readByte()
	{
		if(lenbuf == -1)throw new InputMismatchException();
		if(ptrbuf >= lenbuf){
			ptrbuf = 0;
			try { lenbuf = is.read(inbuf); } catch (IOException e) { throw new InputMismatchException(); }
			if(lenbuf <= 0)return -1;
		}
		return inbuf[ptrbuf++];
	}
	
	private boolean isSpaceChar(int c) { return !(c >= 33 && c <= 126); }
	private int skip() { int b; while((b = readByte()) != -1 && isSpaceChar(b)); return b; }
	
	private double nd() { return Double.parseDouble(ns()); }
	private char nc() { return (char)skip(); }
	
	private String ns()
	{
		int b = skip();
		StringBuilder sb = new StringBuilder();
		while(!(isSpaceChar(b))){ // when nextLine, (isSpaceChar(b) && b != ' ')
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}
	
	private char[] ns(int n)
	{
		char[] buf = new char[n];
		int b = skip(), p = 0;
		while(p < n && !(isSpaceChar(b))){
			buf[p++] = (char)b;
			b = readByte();
		}
		return n == p ? buf : Arrays.copyOf(buf, p);
	}
	
	private int[] na(int n)
	{
		int[] a = new int[n];
		for(int i = 0;i < n;i++)a[i] = ni();
		return a;
	}
	
	private long[] nal(int n)
	{
		long[] a = new long[n];
		for(int i = 0;i < n;i++)a[i] = nl();
		return a;
	}
	
	private char[][] nm(int n, int m) {
		char[][] map = new char[n][];
		for(int i = 0;i < n;i++)map[i] = ns(m);
		return map;
	}
	
	private int[][] nmi(int n, int m) {
		int[][] map = new int[n][];
		for(int i = 0;i < n;i++)map[i] = na(m);
		return map;
	}
	
	private int ni() { return (int)nl(); }
	
	private long nl()
	{
		long num = 0;
		int b;
		boolean minus = false;
		while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
		if(b == '-'){
			minus = true;
			b = readByte();
		}
		
		while(true){
			if(b >= '0' && b <= '9'){
				num = num * 10 + (b - '0');
			}else{
				return minus ? -num : num;
			}
			b = readByte();
		}
	}
	
	private static void tr(Object... o) { System.out.println(Arrays.deepToString(o)); }
}
0