#66811 (Java) No.324 落ちてた閉路グラフ

• 問題: No.324 落ちてた閉路グラフ
• ユーザー: Grenache
• 提出日時: 2015-12-18 16:50:40
• 言語: Java (openjdk 23)
• 結果: AC
• 実行時間: 216 ms / 5,000 ms
• コード長: 3,287 bytes
• コンパイル時間: 4,225 ms
• コンパイル使用メモリ: 78,416 KB
• 実行使用メモリ: 53,276 KB
• 最終ジャッジ日時: 2024-11-15 19:34:51
• 合計ジャッジ時間: 8,692 ms
• ジャッジサーバーID （参考情報）: judge1 / judge5

ファイルパターン	結果
sample	AC * 4
other	AC * 34

ソースコード

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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.Iterator;
public class Main_yukicoder324_1 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        Printer pr = new Printer(System.out);
        final int INF = Integer.MAX_VALUE / 2;
        int n = sc.nextInt();
        int m = sc.nextInt();
        int[] w = new int[n];
        for (int i = 0; i < n; i++) {
            w[i] = sc.nextInt();
        }
        if (m == 0) {
            pr.println(0);
            pr.close();
            sc.close();
            return;
        }
        int[][][] dp = new int[2][m + 1][2];
        int[][][] dp2 = new int[2][m + 1][2];
        for (int i = 0; i < 2; i++) {
            for (int j = 0; j <= m; j++) {
                Arrays.fill(dp[i][j], -INF);
                Arrays.fill(dp2[i][j], -INF);
            }
        }
        for (int i = 0; i < 2; i++) {
            dp[i][0][0] = 0;
        }
        dp2[0][1][1] = 0;
        for (int i = 1; i < n; i++) {
            int tmpi = i % 2;
            int tmpim = (i + 1) % 2;
            for (int j = 1; j <= m; j++) {
                if (i != n - 1) {
                    dp[tmpi][j][0] = Math.max(dp[tmpim][j][0], dp[tmpim][j][1]);
                    dp[tmpi][j][1] = Math.max(dp[tmpim][j - 1][0], dp[tmpim][j - 1][1] + w[i - 1]);
                    dp2[tmpi][j][0] = Math.max(dp2[tmpim][j][0], dp2[tmpim][j][1]);
                    dp2[tmpi][j][1] = Math.max(dp2[tmpim][j - 1][0], dp2[tmpim][j - 1][1] + w[i - 1]);
                } else {
                    dp[tmpi][j][0] = Math.max(dp[tmpim][j][0], dp[tmpim][j][1]);
                    dp[tmpi][j][1] = Math.max(dp[tmpim][j - 1][0], dp[tmpim][j - 1][1] + w[i - 1]);
                    dp2[tmpi][j][0] = Math.max(dp2[tmpim][j][0], dp2[tmpim][j][1]);
                    dp2[tmpi][j][1] = Math.max(dp2[tmpim][j - 1][0] + w[i], dp2[tmpim][j - 1][1] + w[i - 1] + w[i]);
                }
            }
        }
        int max = -INF;
        for (int i = 0; i < 2; i++) {
            max = Math.max(max, dp[(n - 1) % 2][m][i]);
            max = Math.max(max, dp2[(n - 1) % 2][m][i]);
        }
        pr.println(max);
        pr.close();
        sc.close();
    }
    @SuppressWarnings("unused")
    private static class Scanner {
        BufferedReader br;
        Iterator<String> it;
        Scanner (InputStream in) {
            br = new BufferedReader(new InputStreamReader(in));
        }
        String next() throws RuntimeException  {
            try {
                if (it == null || !it.hasNext()) {
                    it = Arrays.asList(br.readLine().split(" ")).iterator();
                }
                return it.next();
            } catch (IOException e) {
                throw new IllegalStateException();
            }
        }
        int nextInt() throws RuntimeException {
            return Integer.parseInt(next());
        }
        long nextLong() throws RuntimeException {
            return Long.parseLong(next());
        }
        float nextFloat() throws RuntimeException {
            return Float.parseFloat(next());
        }
        double nextDouble() throws RuntimeException {
            return Double.parseDouble(next());
        }
        void close() {
            try {
                br.close();
            } catch (IOException e) {
//              throw new IllegalStateException();
            }
        }
    }
    private static class Printer extends PrintWriter {
        Printer(PrintStream out) {
            super(out);
        }
    }
}
 
 
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