結果

問題 No.117 組み合わせの数
ユーザー GrenacheGrenache
提出日時 2016-05-19 20:12:27
言語 Java
(openjdk 23)
結果
AC  
実行時間 831 ms / 5,000 ms
コード長 2,880 bytes
コンパイル時間 3,575 ms
コンパイル使用メモリ 79,416 KB
実行使用メモリ 100,764 KB
最終ジャッジ日時 2024-10-06 10:21:11
合計ジャッジ時間 5,931 ms
ジャッジサーバーID
(参考情報)
judge4 / judge5
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ファイルパターン 結果
other AC * 1
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

import java.io.*;
import java.util.*;
public class Main_yukicoder117 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
Printer pr = new Printer(System.out);
int t = sc.nextInt();
preCombi2(2_000_000);
for (int i = 0; i < t; i++) {
String[] s = sc.next().split("[\\,\\(\\)]");
// pr.printf("%s %s %s\n", s[0], s[1], s[2]);
switch (s[0]) {
case "C":
pr.println(C(Integer.parseInt(s[1]), Integer.parseInt(s[2])));
break;
case "P":
pr.println(P(Integer.parseInt(s[1]), Integer.parseInt(s[2])));
break;
case "H":
pr.println(H(Integer.parseInt(s[1]), Integer.parseInt(s[2])));
break;
}
}
pr.close();
sc.close();
}
private static int MOD = 1_000_000_007;
private static long[] fact;
private static long[] ifact;
private static void preCombi2(int size) {
// cache size need size * 2 * 16.
fact = new long[size + 1];
fact[0] = 1;
for (int i = 1; i <= size; i++) {
fact[i] = fact[i - 1] * i % MOD;
}
ifact = new long[size + 1];
ifact[0] = 1;
int loop = MOD - 2;
long x = fact[size];
ifact[size] = 1;
while (loop > 0) {
if (loop % 2 == 1) {
ifact[size] = ifact[size] * x % MOD;
}
x = x * x % MOD;
loop /= 2;
}
for (int i = size - 1; i >= 0; i--) {
ifact[i] = ifact[i + 1] * (i + 1) % MOD;
}
}
private static int C(int n, int r) {
if (r > n) {
return 0;
}
return (int)(((fact[n] * ifact[n - r]) % MOD) * ifact[r] % MOD);
}
private static int P(int n, int r) {
if (r > n) {
return 0;
}
return (int)((fact[n] * ifact[n -r]) % MOD);
}
private static int H(int n, int r) {
if (n == 0 && r == 0) {
return 1;
}
return C(n + r - 1, r);
}
@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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