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));
}
}