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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#99649#6344. The Best Problem of 2021xiaoyaowudiAC ✓109ms35980kbC++172.6kb2023-04-23 11:19:262023-04-23 11:19:28

Judging History

你现在查看的是最新测评结果

  • [2023-08-10 23:21:45]
  • System Update: QOJ starts to keep a history of the judgings of all the submissions.
  • [2023-04-23 11:19:28]
  • 评测
  • 测评结果:AC
  • 用时:109ms
  • 内存:35980kb
  • [2023-04-23 11:19:26]
  • 提交

answer

#include <iostream>
#include <algorithm>
#include <bitset>
constexpr int N(2010),p(998244353);
std::bitset<N> b[N];bool hv[N];
int fp(int a,int b){int ans(1),off(a);while(b){if(b&1) ans=1ll*ans*off%p;off=1ll*off*off%p;b>>=1;}return ans;}
int main()
{
	std::ios::sync_with_stdio(false);
	std::cin.tie(nullptr);
	int n,m;
	std::cin>>n>>m;
	static std::bitset<N> a[N],xb;
	for(int i(1);i<=n;++i)
	{
		static char s[N];std::cin>>s;
		for(int j(0);j<m;++j)
		{
			a[i][m-j-1]=(s[j]=='1');
		}
		bool st(false);
		for(int j(m-1);j>=0;--j) if(a[i][j])
		{
			if(hv[j])
			{
				a[i]^=b[j];
			}
			else
			{
				hv[j]=st=true;
				b[j]=a[i];
				break;
			}
		}
		if(!st){std::cout<<0<<std::endl;return 0;}
	}
	{
		static char s[N];std::cin>>s;
		for(int j(0);j<m;++j) xb[m-j-1]=(s[j]=='1');
	}
	for(int i(m-1);i>=0;--i) if(hv[i]) for(int j(i+1);j<m;++j) if(hv[j] && b[j][i]) b[j]^=b[i];
	static int x[N];int cnt(0);
	static std::bitset<N> cur;
	for(int j(m-1);j>=0;--j) if(hv[j])
	{
		std::bitset<N> nw(cur^b[j]);
		bool cap(true);
		for(int t(m-1);t>=0;--t) if(xb[t]!=nw[t])
		{
			if(xb[t]<nw[t]) cap=false;
			break;
		}
		if(cap) cur=nw,x[++cnt]=1;
		else x[++cnt]=0;
	}
	if(!x[1]){std::cout<<0<<std::endl;return 0;}
	static int p2[N],pp2[N],ip2[N],ipr[N][N],inv[N];p2[0]=1;pp2[0]=2;ip2[0]=1;
	constexpr int inv2((p+1)/2);
	static int f[N][N],g[N][N];
	for(int i(1);i<N;++i) p2[i]=2ll*p2[i-1]%p,pp2[i]=1ll*pp2[i-1]*pp2[i-1]%p,ip2[i]=1ll*ip2[i-1]*inv2%p;
	inv[1]=1;for(int i(2);i<N;++i) inv[i]=1ll*(p-p/i)*inv[p%i]%p;
	for(int i(0);i<=n;++i){ipr[i][0]=1;for(int j(1);j<=n;++j) ipr[i][j]=1ll*ipr[i][j-1]*ip2[i]%p;}
	static int qf[N],iqf[N];
	qf[0]=iqf[0]=1;for(int i(1);i<N;++i) qf[i]=1ll*qf[i-1]*(p2[i]-1)%p,iqf[i]=fp(qf[i],p-2);
	auto qb=[](int a,int b)->int{return 1ll*qf[a]*iqf[b]%p*iqf[a-b]%p;};
	f[0][0]=2;
	for(int i(1);i<n;++i)
	{
		int c(x[n-i+1]);
		for(int j(0);j<=i;++j)
		{
			unsigned long long cur(0);
			if(c==0)
			{
				cur+=1ll*ipr[i-j][j]*inv2%p*qb(i-1,j);
				cur+=1ll*ip2[j+1]*f[i-1][j];
				if(j) cur+=f[i-1][j-1];
			}
			else
			{
				cur+=1ll*pp2[j]*ipr[i-j][j]%p*inv2%p*qb(i-1,j);
				cur+=1ll*ip2[j+1]*f[i-1][j];
				if(j) cur+=1ll*f[i-1][j-1]*pp2[j-1];
			}
			f[i][j]=cur%p;
		}
	}
	static int sum[N];
	sum[0]=1;
	for(int j(1);j<=n;++j)
	{
		sum[j]=(1ll*f[n-1][j-1]*pp2[j-1]%p*fp(2,(n-j)*j)+1ll*pp2[j]*qb(n-1,j))%p*inv2%p;
	}
	for(int j(0);j<=cnt;++j)
	{
		for(int k(0);k<j;++k)
		{
			sum[j]=(sum[j]+1ll*(p-sum[k])*qb(cnt-k,j-k))%p;
		}
	}
	std::cout<<sum[n]<<std::endl;
	return 0;
}

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 0ms
memory: 5484kb

input:

4 4
0001
0010
0100
1000
1101

output:

7364

result:

ok 1 number(s): "7364"

Test #2:

score: 0
Accepted
time: 2ms
memory: 5356kb

input:

3 2
00
00
00
11

output:

0

result:

ok 1 number(s): "0"

Test #3:

score: 0
Accepted
time: 0ms
memory: 7500kb

input:

2 3
110
101
101

output:

1

result:

ok 1 number(s): "1"

Test #4:

score: 0
Accepted
time: 2ms
memory: 5552kb

input:

3 10
1111100110
0011110100
0101100001
1110000001

output:

38

result:

ok 1 number(s): "38"

Test #5:

score: 0
Accepted
time: 3ms
memory: 5524kb

input:

7 13
1000101001000
1000000010000
1010101011111
1001100100111
1111111101100
0101010101110
1101100010100
1000010011001

output:

744450298

result:

ok 1 number(s): "744450298"

Test #6:

score: 0
Accepted
time: 2ms
memory: 7944kb

input:

100 100
1111010111010001011111110010101001001101000000000000011000001100101000100011100011000000110000001010
1001001110111010100100010111100010111110101100101000010111001011111010111100111000000011101010100111
000011010111000100110100010010011101001111100110111000100101010001101100101011000111101101...

output:

19562313

result:

ok 1 number(s): "19562313"

Test #7:

score: 0
Accepted
time: 9ms
memory: 12396kb

input:

400 500
1011011011010010111110101001010011000100001111000111111111001111100010101011110011010010011100100100111111000111001110111100101010000000100100011011011001011100100000000100001100001010100010111000110011000100101001010110110100110101000011011011011100111110010100101000011001100000001100001000...

output:

681985268

result:

ok 1 number(s): "681985268"

Test #8:

score: 0
Accepted
time: 26ms
memory: 24956kb

input:

999 1997
011101110101100100111101100000000100001110010001010100011010111010101101011100001000010001110100110111101101010111010011101111011001011100110110101011111011000111101011011000010101100101001110000111010101111100000100100101110000111001010101110110000001111111100110110011110100101000011100011...

output:

435150194

result:

ok 1 number(s): "435150194"

Test #9:

score: 0
Accepted
time: 103ms
memory: 35512kb

input:

1901 2000
10000111000111010000000000100110001100110010011001101110001011000001011000010111101110111001111000010110110100010100010101011111011101100111010101010001010010111010001011000001011010100011000101101010001110111100000101110110011001101111101111000100001010011101011110001100110001100000111110...

output:

9254020

result:

ok 1 number(s): "9254020"

Test #10:

score: 0
Accepted
time: 109ms
memory: 35532kb

input:

1984 2000
11111101001011101001011011010011000001100000101000001001111000100010011011000110110110100000001100000000001111101001111010111110000000010000000111111001010111101101110000111110010111001011011111010010110001011100110101000110000100010100100101010111101100000011110010010100101011101001110110...

output:

870006511

result:

ok 1 number(s): "870006511"

Test #11:

score: 0
Accepted
time: 46ms
memory: 4448kb

input:

2000 2000
00010001100000101100000110010101010101110010001000000100010010110010001100110000001110100111010110100110101010101111011100001110100011001000010001000011100111010100110101000111010010010111001001101100100000101001111111001111101001000101001011101001010010010101011110111001101101101001001000...

output:

0

result:

ok 1 number(s): "0"

Test #12:

score: 0
Accepted
time: 0ms
memory: 7544kb

input:

11 11
10000000000
01000000000
00100000000
00010000000
00001000000
00000100000
00000010000
00000001000
00000000100
00000000010
00000000001
10111110000

output:

312889397

result:

ok 1 number(s): "312889397"

Test #13:

score: 0
Accepted
time: 3ms
memory: 9664kb

input:

100 100
1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
0100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

output:

554554135

result:

ok 1 number(s): "554554135"

Test #14:

score: 0
Accepted
time: 12ms
memory: 22664kb

input:

1000 1000
10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

output:

944188930

result:

ok 1 number(s): "944188930"

Test #15:

score: 0
Accepted
time: 65ms
memory: 35980kb

input:

1999 1999
10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

output:

753324940

result:

ok 1 number(s): "753324940"

Test #16:

score: 0
Accepted
time: 74ms
memory: 35292kb

input:

2000 2000
10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

output:

489943678

result:

ok 1 number(s): "489943678"

Test #17:

score: 0
Accepted
time: 66ms
memory: 35948kb

input:

2000 2000
10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

output:

458543942

result:

ok 1 number(s): "458543942"

Test #18:

score: 0
Accepted
time: 3ms
memory: 7712kb

input:

37 100
0000000000100000010101011000010111111000000000000000000000000000000000001110100110101000000010110000
0111100011011110101011110100101001011000000000110010001010110100000000010000100000111011000000100000
0001110011110000001100011000010011001000000000000000000000000000000000000000000000000000010...

output:

807297668

result:

ok 1 number(s): "807297668"

Test #19:

score: 0
Accepted
time: 4ms
memory: 7824kb

input:

71 93
100010100111111001011100000000011001101101010001011001110001101110010000001000001000000000011
110100111110010001000110000101111010111111000111011010100001010000010110011000000100000000000
110010010110000000010001010100000011000100000010011100100000100100101100010100001100000010000
000101010010...

output:

50935767

result:

ok 1 number(s): "50935767"

Test #20:

score: 0
Accepted
time: 2ms
memory: 3600kb

input:

101 114
010101111101011101100001000100001001000100011100111111110010001111101001100100000110100101010110000000000000001000
101010000011100100000001100000110000111001111011000010010101001011110110100101011101111111111110111010000000000000
11011100100101010100101100000101100000010100000010010110101010...

output:

0

result:

ok 1 number(s): "0"

Test #21:

score: 0
Accepted
time: 0ms
memory: 5616kb

input:

17 2000
0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010010101111100001010111000001111010110101100011000011011111110001011001011010111110111110000110011101111011010110101011010100110001111110110110101000101110100110011001000010000001010...

output:

526829746

result:

ok 1 number(s): "526829746"

Test #22:

score: 0
Accepted
time: 3ms
memory: 5704kb

input:

30 1999
0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

output:

708057099

result:

ok 1 number(s): "708057099"

Test #23:

score: 0
Accepted
time: 2ms
memory: 3592kb

input:

54 2000
0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

output:

0

result:

ok 1 number(s): "0"

Test #24:

score: 0
Accepted
time: 12ms
memory: 20920kb

input:

791 1999
101011000010100101111110010001001001000000000001111100001000101100011110001010010011111110111010100011111010001110000001100010000011001110110011011011110110101100010010110111011000101111010100101110110010100011100100011001100000000001000001010100000000100111011000101111100100001000011010001...

output:

64451741

result:

ok 1 number(s): "64451741"

Test #25:

score: 0
Accepted
time: 28ms
memory: 20984kb

input:

944 2000
110101011100010000001010011011000001001001101001001011101110100000001000000010101011111001101010110100011101110100110010110000011100011111000001011110100111011101110010100100110111001110110001101010011101100010100100000010110101000101111000101110011000111000111111101110001101101110111110001...

output:

996119909

result:

ok 1 number(s): "996119909"

Test #26:

score: 0
Accepted
time: 41ms
memory: 22996kb

input:

1102 1999
10001010010010110101001000110000010000000110101001010111100100000110001111111100111001000111000111110100101101010110111110110001111011110101111001101100101110001011100001100000000000111111111000111010000111100010011010100001001011110111011110100001000100111000100001000010111001111011110001...

output:

855516290

result:

ok 1 number(s): "855516290"

Test #27:

score: 0
Accepted
time: 37ms
memory: 6164kb

input:

1931 2000
01101111100011101110100101000110011110000111000001010001011111010110011001111110110010111000100010111101001100001100001100010101000011001000110001011101111001000111101011011100011110010100001111111000101111000110000000000010110101110001000001011111001000001001100110101100100010101010010000...

output:

0

result:

ok 1 number(s): "0"

Test #28:

score: 0
Accepted
time: 98ms
memory: 35404kb

input:

1944 1999
10000110101111110110111101101000111110100010000011101101000011101100110000110001110000100000100101011111100100111000100110011111110111011100100000111000101110011100101011000011101101010001111110110100101101001011010011111111011111001101010000101011110010010110110101110000000111010100111101...

output:

52786402

result:

ok 1 number(s): "52786402"

Test #29:

score: 0
Accepted
time: 28ms
memory: 5912kb

input:

1977 2000
10011110110110110011001100011011011110111110001001101000101110100111011100011101001100100101110101010001100011001110111011101101100010000010100010001011011011001111011010111011100010101010101111101100001000111011100010111000000101111110100001111011111111111111110101101001101001111100011100...

output:

0

result:

ok 1 number(s): "0"

Test #30:

score: 0
Accepted
time: 95ms
memory: 35888kb

input:

2000 2000
01110010111000111001110000110111011110010010111001000001100101101011000001010111111010001100110000101001001000000000011001101101010001010011010000111011111101001110110010110101110101100100000011110100100010110001110010101001000110100100001001001111000111001011110110101100101011011011101010...

output:

3964016

result:

ok 1 number(s): "3964016"

Test #31:

score: 0
Accepted
time: 34ms
memory: 4396kb

input:

1994 1999
00001100011011001011110111100001111001010110101100010010111001011000100111011110000010100111100001101101100000101111101111001001011001000111111011010110001111001100110000100001101001011001001011100101000101010000110001101000100110110010011010000001000110001010101101111100010110001010101000...

output:

0

result:

ok 1 number(s): "0"

Test #32:

score: 0
Accepted
time: 45ms
memory: 6076kb

input:

1997 2000
01111000101001101011000100101111110000011100111100101100111100110000100101010001011110111100101000001001000110100110111101011101010100010110101011010010000100000110011111100000100011000110001110000111011010110001001001000001110101011011011000101111010000010101101111110100110011110100101000...

output:

0

result:

ok 1 number(s): "0"

Test #33:

score: 0
Accepted
time: 108ms
memory: 35296kb

input:

2000 2000
00110111110110101110100001011000000101001011010011111001100000001001101100111111100001100010111101001110101001101010111011111000000110101101101110100111110101111110010000001001010100111101011010100000010001110100100010010100101010100110011101011110111100111110101110111010010111010010100010...

output:

385756366

result:

ok 1 number(s): "385756366"

Test #34:

score: 0
Accepted
time: 93ms
memory: 35800kb

input:

1988 1999
10101010110010100000101100110010001110101111010010001011010100100010101111001010100110100101100100111101000001000110001011110000001110000000110000001111000100101100000000111011011011110111101000001110111111000110011011111011010000010011100010010110111010000011010001011100010001011001100000...

output:

534584509

result:

ok 1 number(s): "534584509"

Test #35:

score: 0
Accepted
time: 39ms
memory: 4516kb

input:

2000 2000
00100000011001010111100000100001011101010011001010100100100001100000000100010110000110010111010000100110010000010001110100010100111001000110111001011101101110111000000111000000111101011010000110010011110011010000010101000111100100100001101001100010101101011111001010001011101001100001011010...

output:

0

result:

ok 1 number(s): "0"

Test #36:

score: 0
Accepted
time: 32ms
memory: 4448kb

input:

1995 2000
10010000010101100111011100110001101101000100010011110100110111110000000111010000111101011000101000111000010010010111000010101110110100011100111010110110110100111101010100000110001010010001011001000100011110101100110111010110101010100100011010101100001010111111000100101110001101000000010010...

output:

0

result:

ok 1 number(s): "0"

Test #37:

score: 0
Accepted
time: 105ms
memory: 35952kb

input:

1999 1999
11011110110011001100010110011001000101010101001001010101111111000111100000001101101101101010001111010000011101100110100111011010011011001101010011001100011111010100001000100100100111010111001000000010101100100010001111100100101110100010010010101000000110101011101001110010111111011101000101...

output:

678369480

result:

ok 1 number(s): "678369480"

Test #38:

score: 0
Accepted
time: 34ms
memory: 4392kb

input:

1999 2000
11000110010001011100111010011110110100101101000010111101001010100000100100011101011000110000101011011111110101001101111010010010010001011110101001010000010100110110100110011110011101001100000001110100001100110111011001110000110110000101110011110010110100110011010111011001011010111000000110...

output:

0

result:

ok 1 number(s): "0"