#149005 (Java) No.482 あなたの名は

• 問題: No.482 あなたの名は
• ユーザー: Grenache
• 提出日時: 2017-02-10 22:34:50
• 言語: Java (openjdk 23)
• 結果: AC
• 実行時間: 222 ms / 2,000 ms
• コード長: 4,362 bytes
• コンパイル時間: 4,312 ms
• コンパイル使用メモリ: 77,876 KB
• 実行使用メモリ: 41,888 KB
• 最終ジャッジ日時: 2024-12-29 19:14:38
• 合計ジャッジ時間: 9,987 ms
• ジャッジサーバーID （参考情報）: judge2 / judge1

ファイルパターン	結果
sample	AC * 3
other	AC * 28

ソースコード

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import java.io.*;
import java.util.*;
public class Main_yukicoder482 {
    private static Scanner sc;
    private static Printer pr;
    private static void solve() {
        int n = sc.nextInt();
        long k = sc.nextLong();
        int[] d = new int[n];
        int[] p = new int[n];
        for (int i = 0; i < n; i++) {
            d[i] = sc.nextInt();
            p[d[i] - 1] = i;
        }
        int cnt = 0;
        for (int i = 0; i < n; i++) {
            if (d[i] != i + 1) {
                int tmp = d[i];
                d[i] = d[p[i]];
                d[p[i]] = tmp;
                cnt++;
                p[tmp - 1] = p[i];
            }
        }
        if (k < cnt) {
            pr.println("NO");
        } else {
            if ((k - cnt) % 2 == 0) {
                pr.println("YES");
            } else {
                pr.println("NO");
            }
        }
    }
    // ---------------------------------------------------
    public static void main(String[] args) {
        sc = new Scanner(System.in);
        pr = new Printer(System.out);
        solve();
        pr.close();
        sc.close();
    }
    @SuppressWarnings("unused")
    private static class Scanner {
        BufferedReader br;
        Scanner (InputStream in) {
            br = new BufferedReader(new InputStreamReader(in));
        }
        private boolean isPrintable(int ch) {
            return ch >= '!' && ch <= '~';
        }
        private boolean isCRLF(int ch) {
            return ch == '\n' || ch == '\r' || ch == -1;
        }
        private int nextPrintable() {
            try {
                int ch;
                while (!isPrintable(ch = br.read())) {
                    if (ch == -1) {
                        throw new NoSuchElementException();
                    }
                }
                return ch;
            } catch (IOException e) {
                throw new NoSuchElementException();
            }
        }
        String next() {
            try {
                int ch = nextPrintable();
                StringBuilder sb = new StringBuilder();
                do {
                    sb.appendCodePoint(ch);
                } while (isPrintable(ch = br.read()));
                return sb.toString();
            } catch (IOException e) {
                throw new NoSuchElementException();
            }
        }
        int nextInt() {
            try {
                // parseInt from Integer.parseInt()
                boolean negative = false;
                int res = 0;
                int limit = -Integer.MAX_VALUE;
                int radix = 10;
                int fc = nextPrintable();
                if (fc < '0') {
                    if (fc == '-') {
                        negative = true;
                        limit = Integer.MIN_VALUE;
                    } else if (fc != '+') {
                        throw new NumberFormatException();
                    }
                    fc = br.read();
                }
                int multmin = limit / radix;
                int ch = fc;
                do {
                    int digit = ch - '0';
                    if (digit < 0 || digit >= radix) {
                        throw new NumberFormatException();
                    }
                    if (res < multmin) {
                        throw new NumberFormatException();
                    }
                    res *= radix;
                    if (res < limit + digit) {
                        throw new NumberFormatException();
                    }
                    res -= digit;
                } while (isPrintable(ch = br.read()));
                return negative ? res : -res;
            } catch (IOException e) {
                throw new NoSuchElementException();
            }
        }
        long nextLong() {
            try {
                // parseLong from Long.parseLong()
                boolean negative = false;
                long res = 0;
                long limit = -Long.MAX_VALUE;
                int radix = 10;
                int fc = nextPrintable();
                if (fc < '0') {
                    if (fc == '-') {
                        negative = true;
                        limit = Long.MIN_VALUE;
                    } else if (fc != '+') {
                        throw new NumberFormatException();
                    }
                    fc = br.read();
                }
                long multmin = limit / radix;
                int ch = fc;
                do {
                    int digit = ch - '0';
                    if (digit < 0 || digit >= radix) {
                        throw new NumberFormatException();
                    }
                    if (res < multmin) {
                        throw new NumberFormatException();
                    }
                    res *= radix;
                    if (res < limit + digit) {
                        throw new NumberFormatException();
                    }
                    res -= digit;
                } while (isPrintable(ch = br.read()));
                return negative ? res : -res;
            } catch (IOException e) {
                throw new NoSuchElementException();
            }
        }
        float nextFloat() {
            return Float.parseFloat(next());
        }
        double nextDouble() {
            return Double.parseDouble(next());
        }
        String nextLine() {
            try {
                int ch;
                while (isCRLF(ch = br.read())) {
                    if (ch == -1) {
                        throw new NoSuchElementException();
                    }
                }
                StringBuilder sb = new StringBuilder();
                do {
                    sb.appendCodePoint(ch);
                } while (!isCRLF(ch = br.read()));
                return sb.toString();
            } catch (IOException e) {
                throw new NoSuchElementException();
            }
        }
        void close() {
            try {
                br.close();
            } catch (IOException e) {
//              throw new NoSuchElementException();
            }
        }
    }
    private static class Printer extends PrintWriter {
        Printer(PrintStream out) {
            super(out);
        }
    }
}
 
 
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