#365344 (Java) No.472 平均順位

• 問題: No.472 平均順位
• ユーザー: wdkkou
• 提出日時: 2019-08-04 18:46:09
• 言語: Java (openjdk 23)
• 結果: AC
• 実行時間: 594 ms / 2,000 ms
• コード長: 3,572 bytes
• コンパイル時間: 1,943 ms
• コンパイル使用メモリ: 81,948 KB
• 実行使用メモリ: 45,352 KB
• 最終ジャッジ日時: 2024-07-08 13:35:12
• 合計ジャッジ時間: 7,049 ms
• ジャッジサーバーID （参考情報）: judge5 / judge1

ファイルパターン	結果
sample	AC * 4
other	AC * 16

ソースコード

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import java.util.*;
import java.io.*;
public class Main {
    public static void main(String[] args) {
        FastScanner sc = new FastScanner();
        int n = sc.nextInt();
        int p = sc.nextInt();
        int[] a = new int[n];
        int[] b = new int[n];
        int[] c = new int[n];
        for (int i = 0; i < n; i++) {
            a[i] = sc.nextInt();
            b[i] = sc.nextInt();
            c[i] = sc.nextInt();
        }
        int[] current = new int[p + 1];
        int[] next = new int[p + 1];
        for (int i = 1; i <= n; i++) {
            for (int j = 0; j <= p; j++) {
                next[j] = current[j] + a[i - 1];
                if (j - 1 >= 0) {
                    // dp[i][j] = Math.min(dp[i][j], dp[i - 1][j - 1] + b[i - 1]);
                    next[j] = Math.min(next[j], current[j - 1] + b[i - 1]);
                }
                if (j - 2 >= 0) {
                    next[j] = Math.min(next[j], current[j - 2] + c[i - 1]);
                }
                if (j - 3 >= 0) {
                    next[j] = Math.min(next[j], current[j - 3] + 1);
                }
            }
            current = (int[]) next.clone();
        }
        // System.out.println(Arrays.toString(next));
        float ans = next[p] / (float) n;
        System.out.printf("%.5f%n", ans);
    }
}
class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;
    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        } else {
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }
    private int readByte() {
        if (hasNextByte())
            return buffer[ptr++];
        else
            return -1;
    }
    private static boolean isPrintableChar(int c) {
        return 33 <= c && c <= 126;
    }
    public boolean hasNext() {
        while (hasNextByte() && !isPrintableChar(buffer[ptr]))
            ptr++;
        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();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while (true) {
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            } else if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }
    public int nextInt() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE)
            throw new NumberFormatException();
        return (int) nl;
    }
    public double nextDouble() {
        return Double.parseDouble(next());
    }
}
 
 
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