結果
| 問題 |
No.1846 Good Binary Matrix
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2022-02-18 23:02:09 |
| 言語 | Java (openjdk 23) |
| 結果 |
AC
|
| 実行時間 | 1,967 ms / 2,000 ms |
| コード長 | 3,545 bytes |
| コンパイル時間 | 2,281 ms |
| コンパイル使用メモリ | 78,344 KB |
| 実行使用メモリ | 100,156 KB |
| 最終ジャッジ日時 | 2024-06-29 09:43:42 |
| 合計ジャッジ時間 | 28,192 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 * 35 |
ソースコード
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.NoSuchElementException;
class Main {
public static void main(String[] args) {
new Main().run();
}
void run() {
solve();
}
long mod=(long)1e9+7;
long pow(long a, long n) {
if (n==0) return 1;
return pow(a*a%mod,n/2) * (n%2==1?a:1) %mod;
}
long inv(long a) {
return pow(a, mod-2);
}
long c(int n, int k) {
// if (n==k) return 1;
if (n<0||k<0||n-k<0) return 0;
// return (c(n-1,k)+c(n-1,k-1))%mod;
return fac[n]*ifac[k]%mod*ifac[n-k]%mod;
}
long slow(int H, int W) {
long ans=0;
for (int i=0;i<=H;++i) {
for (int j=0;j<=W;++j) {
ans+=pow(2,i*j)*pow(-1,i+j)%mod*c(H,i)%mod*c(W,j)%mod;
ans%=mod;
}
}
ans=ans*pow(-1,H+W)%mod;
ans=(ans+mod)%mod;
return ans;
}
int MAX=2000000;
long[] fac=new long[MAX];
long[] ifac=new long[MAX];
long[] inv=new long[MAX];
{
fac[0]=fac[1]=ifac[0]=ifac[1]=inv[0]=inv[1]=1;
for (int i=2;i<MAX;++i) {
fac[i]=i*fac[i-1]%mod;
inv[i]=mod-(mod/i)*inv[(int)(mod%i)]%mod;
ifac[i]=inv[i]*ifac[i-1]%mod;
}
}
void solve() {
FastScanner sc=new FastScanner();
PrintWriter pw=new PrintWriter(System.out);
int H=sc.nextInt();
int W=sc.nextInt();
long ans=0;
for (int i=0;i<=W;++i) {
ans+=pow(1-pow(2,i),H)*pow(-1,i)%mod*c(W,i)%mod;
ans%=mod;
}
ans=ans*pow(-1,H+W)%mod;
ans=(ans+mod)%mod;
System.out.println(ans);
pw.close();
}
static void tr(Object...objects) {
System.out.println(Arrays.deepToString(objects));
}
}
class FastScanner {
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 static 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();
}
}