結果
| 問題 | 
                            No.181 A↑↑N mod M
                             | 
                    
| コンテスト | |
| ユーザー | 
                             | 
                    
| 提出日時 | 2018-04-15 21:04:29 | 
| 言語 | Java  (openjdk 23)  | 
                    
| 結果 | 
                             
                                AC
                                 
                             
                            
                         | 
                    
| 実行時間 | 50 ms / 5,000 ms | 
| コード長 | 3,251 bytes | 
| コンパイル時間 | 2,137 ms | 
| コンパイル使用メモリ | 78,688 KB | 
| 実行使用メモリ | 36,988 KB | 
| 最終ジャッジ日時 | 2024-06-27 00:07:41 | 
| 合計ジャッジ時間 | 5,630 ms | 
| 
                            ジャッジサーバーID (参考情報)  | 
                        judge3 / judge4 | 
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| ファイルパターン | 結果 | 
|---|---|
| sample | AC * 6 | 
| other | AC * 37 | 
ソースコード
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.NoSuchElementException;
public class Main {
	public static void main(String[] args) throws FileNotFoundException {
		long t = System.currentTimeMillis();
		new Main().run();
		System.err.println(System.currentTimeMillis() - t);
	}
	long gcd(long a, long b) {
		if (a > b)
			return gcd(b, a);
		if (a == 0)
			return b;
		return gcd(b % a, a);
	}
	long pow(long a, long n, long m) {
		long ret = 1;
		for (; n > 0; n >>= 1, a = a * a % m) {
			if (n % 2 == 1) {
				ret = ret * a % m;
			}
		}
		return ret;
	}
	int[] phi = new int[3000];
	long g(long a, long n, int m) {
		if (m == 1)
			return 0;
		else if (n == 0) {
			return 1 % m;
		} else if (n == 1) {
			return a % m;
		} else if (n == 2) {
			return pow(a % m, a, m);
		} else if (n == 3 && a == 2) {
			return 16 % m;
		} else {
			return pow(a, g(a, n - 1, phi[m]) + phi[m], m);
		}
	}
	public void run() {
		Scanner sc = new Scanner();
		long a = sc.nextLong();
		long n = sc.nextLong();
		int m = sc.nextInt();
		for (int i = 2; i < phi.length; ++i) {
			phi[i] = i;
		}
		for (int i = 2; i < phi.length; ++i) {
			if (phi[i] != i)
				continue;
			for (int j = i; j < phi.length; j += i) {
				phi[j] = phi[j] / i * (i - 1);
			}
		}
		System.out.println(g(a, n, m));
	}
	class Scanner {
		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 boolean isPrintableChar(int c) {
			return 33 <= c && c <= 126;
		}
		private void skipUnprintable() {
			while (hasNextByte() && !isPrintableChar(buffer[ptr]))
				ptr++;
		}
		public boolean hasNext() {
			skipUnprintable();
			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() {
			return (int) nextLong();
		}
	}
	static void tr(Object... objects) {
		System.out.println(Arrays.deepToString(objects));
	}
}