結果
| 問題 | No.1785 Inequality Signs |
| ユーザー |
 hiromi_ayase
|
| 提出日時 | 2021-12-14 04:20:37 |
| 言語 | Java21 (openjdk 21) |
| 結果 |
TLE
|
| 実行時間 | - |
| コード長 | 5,094 bytes |
| コンパイル時間 | 2,531 ms |
| コンパイル使用メモリ | 86,956 KB |
| 実行使用メモリ | 61,308 KB |
| 最終ジャッジ日時 | 2024-07-23 04:40:27 |
| 合計ジャッジ時間 | 6,538 ms |
|
ジャッジサーバーID （参考情報） |
judge5 / judge4 |
（要ログイン）
テストケース
テストケース表示| 入力 | 結果 | 実行時間 実行使用メモリ |
|---|---|---|
| testcase_00 | AC | 101 ms
60,996 KB |
| testcase_01 | AC | 203 ms
54,104 KB |
| testcase_02 | TLE | - |
| testcase_03 | -- | - |
| testcase_04 | -- | - |
| testcase_05 | -- | - |
| testcase_06 | -- | - |
| testcase_07 | -- | - |
| testcase_08 | -- | - |
| testcase_09 | -- | - |
| testcase_10 | -- | - |
| testcase_11 | -- | - |
| testcase_12 | -- | - |
| testcase_13 | -- | - |
| testcase_14 | -- | - |
| testcase_15 | -- | - |
| testcase_16 | -- | - |
| testcase_17 | -- | - |
| testcase_18 | -- | - |
| testcase_19 | -- | - |
| testcase_20 | -- | - |
| testcase_21 | -- | - |
| testcase_22 | -- | - |
| testcase_23 | -- | - |
| testcase_24 | -- | - |
| testcase_25 | -- | - |
| testcase_26 | -- | - |
| testcase_27 | -- | - |
| testcase_28 | -- | - |
| testcase_29 | -- | - |
| testcase_30 | -- | - |
| testcase_31 | -- | - |
| testcase_32 | -- | - |
| testcase_33 | -- | - |
| testcase_34 | -- | - |
| testcase_35 | -- | - |
| testcase_36 | -- | - |
| testcase_37 | -- | - |
| testcase_38 | -- | - |
| testcase_39 | -- | - |
| testcase_40 | -- | - |
| testcase_41 | -- | - |
| testcase_42 | -- | - |
| testcase_43 | -- | - |
| testcase_44 | -- | - |
| testcase_45 | -- | - |
| testcase_46 | -- | - |
| testcase_47 | -- | - |
| testcase_48 | -- | - |
| testcase_49 | -- | - |
| testcase_50 | -- | - |
| testcase_51 | -- | - |
| testcase_52 | -- | - |
| testcase_53 | -- | - |
ソースコード
import java.util.*;
@SuppressWarnings("unused")
public class Main {
private static void solve() {
int n = ni() - 1;
int k = ni() - 1;
long sa = 0;
long cur = 1;
for (int i = 0; i <= k; i++) {
sa += cur;
sa %= mod;
int x = n + i + 1;
int y = x - n;
cur = y >= 0 ? cur * x % mod * inv(y, mod) % mod : 0;
}
long[] a = new long[n + 1];
a[0] = combNative(n + k, n);
long sa2 = a[0];
for (int i = 0; i < n; i ++) {
int x = n + k - i;
int y = x - n;
a[i + 1] = y >= 0 ? a[i] * y % mod * inv(x, mod) % mod : 0;
sa2 += a[i + 1];
}
long sb = pow(2, n, mod);
long[] b = new long[n + 1];
for (int i = 0; i <= n; i++) {
b[i] = CX(n, i, mod, fif);
}
long ans = sa * sb % mod;
for (int i = 0; i < n; i++) {
sa2 += mod - a[n - i];
sa2 %= mod;
ans += mod - sa2 * b[i] % mod;
ans %= mod;
}
System.out.println(ans);
}
public static long inv(long a, int p)
{
long ret = 1;
long mul = a;
for(long n = p-2;n > 0;n >>>= 1){
if((n&1)==1)ret = ret * mul % p;
mul = mul * mul % p;
}
return ret;
}
private static long combNative(long n, int r) {
long x = 1;
long y = 1;
for (int i = 0; i < r; i++) {
x *= n - i;
x %= mod;
y *= i + 1;
y %= mod;
}
return x * pow(y, mod - 2, mod) % mod;
}
private static long pow(long x, long n, int m) {
if (m == 1)
return 0;
long r = 1;
long y = x % m;
while (n > 0) {
if ((n & 1) != 0)
r = (r * y) % m;
y = (y * y) % m;
n >>= 1;
}
return r;
}
private static int mod = 1000000007;
private static int[][] fif = enumFIF(300000, mod);
public static long CX(long n, long r, int p, int[][] fif) {
if (n < 0 || r < 0 || r > n)
return 0;
int np = (int) (n % p), rp = (int) (r % p);
if (np < rp)
return 0;
if (n == 0 && r == 0)
return 1;
int nrp = np - rp;
if (nrp < 0)
nrp += p;
return (long) fif[0][np] * fif[1][rp] % p * fif[1][nrp] % p * CX(n / p, r / p, p, fif) % p;
}
public static int[][] enumFIF(int n, int mod) {
int[] f = new int[n + 1];
int[] invf = new int[n + 1];
f[0] = 1;
for (int i = 1; i <= n; i++) {
f[i] = (int) ((long) f[i - 1] * i % mod);
}
long a = f[n];
long b = mod;
long p = 1, q = 0;
while (b > 0) {
long c = a / b;
long d;
d = a;
a = b;
b = d % b;
d = p;
p = q;
q = d - c * q;
}
invf[n] = (int) (p < 0 ? p + mod : p);
for (int i = n - 1; i >= 0; i--) {
invf[i] = (int) ((long) invf[i + 1] * (i + 1) % mod);
}
return new int[][] { f, invf };
}
public static void main(String[] args) {
new Thread(null, new Runnable() {
@Override
public void run() {
long start = System.currentTimeMillis();
String debug = args.length > 0 ? args[0] : null;
if (debug != null) {
try {
is = java.nio.file.Files.newInputStream(java.nio.file.Paths.get(debug));
} catch (Exception e) {
throw new RuntimeException(e);
}
}
reader = new java.io.BufferedReader(new java.io.InputStreamReader(is), 32768);
solve();
out.flush();
tr((System.currentTimeMillis() - start) + "ms");
}
}, "", 64000000).start();
}
private static java.io.InputStream is = System.in;
private static java.io.PrintWriter out = new java.io.PrintWriter(System.out);
private static java.util.StringTokenizer tokenizer = null;
private static java.io.BufferedReader reader;
public static String next() {
while (tokenizer == null || !tokenizer.hasMoreTokens()) {
try {
tokenizer = new java.util.StringTokenizer(reader.readLine());
} catch (Exception e) {
throw new RuntimeException(e);
}
}
return tokenizer.nextToken();
}
private static double nd() {
return Double.parseDouble(next());
}
private static long nl() {
return Long.parseLong(next());
}
private static int[] na(int n) {
int[] a = new int[n];
for (int i = 0; i < n; i++)
a[i] = ni();
return a;
}
private static char[] ns() {
return next().toCharArray();
}
private static long[] nal(int n) {
long[] a = new long[n];
for (int i = 0; i < n; i++)
a[i] = nl();
return a;
}
private static int[][] ntable(int n, int m) {
int[][] table = new int[n][m];
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
table[i][j] = ni();
}
}
return table;
}
private static int[][] nlist(int n, int m) {
int[][] table = new int[m][n];
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
table[j][i] = ni();
}
}
return table;
}
private static int ni() {
return Integer.parseInt(next());
}
private static void tr(Object... o) {
if (is != System.in)
System.out.println(java.util.Arrays.deepToString(o));
}
}