QOJ.ac

QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#100002#6344. The Best Problem of 2021tricyzhkxAC ✓120ms32640kbC++142.2kb2023-04-24 12:44:122023-04-24 12:44:17

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.
  • [2023-04-24 12:44:17]
  • 评测
  • 测评结果:AC
  • 用时:120ms
  • 内存:32640kb
  • [2023-04-24 12:44:12]
  • 提交

answer

# include <bits/stdc++.h>
using namespace std;
const int mod=998244353,_2=(mod+1)/2;
typedef long long ll;
typedef bitset<2001> Num;
int n,m,pos[2010],X[2010],ans[2010],f[2010][2010],g[2010][2010];
ll pw[2010],pwpw[2010],qfac[2010],qinv[2010];
char s[2010];
Num d[2010],a;
template<typename T>
void upd(int &a,T b){a=(a+b)%mod;}
ll qC(int n,int m){return n<m || m<0?0:qfac[n]*qinv[n-m]%mod*qinv[m]%mod;}
ll power(ll a,int b)
{
	ll ans=1;
	for(;b;b>>=1,a=a*a%mod)
		if(b&1) ans=ans*a%mod;
	return ans;
}
bool operator<=(const Num &a,const Num &b)
{
	for(int i=m-1;i>=0;i--)
		if(a[i]!=b[i]) return a[i]<b[i];
	return true;
}
bool insert(Num a)
{
	for(int i=m-1;i>=0;i--)
		if(a[i])
		{
			if(d[i].any()) a^=d[i];
			else
			{
				d[i]=a;
				return true;
			}
		}
	return false;
}
int main()
{
	cin>>n>>m;
	for(int i=1;i<=n;i++)
	{
		scanf("%s",s);
		for(int j=0;j<m;j++) a[m-j-1]=s[j]-'0';
		if(!insert(a)) return puts("0"),0;
	}
	for(int i=0;i<m;i++)if(d[i].any())
		for(int j=i+1;j<m;j++)
			if(d[j][i]) d[j]^=d[i];
	for(int i=0,j=0;i<m;i++)
		if(d[i].any()) pos[j++]=i;
	Num cur,lim;
	scanf("%s",s);
	for(int i=0;i<m;i++) lim[m-i-1]=s[i]-'0';
	for(int i=n-1;i>=0;i--)
		if((cur^d[pos[i]])<=lim) cur^=d[pos[i]],X[i]=1;
	if(!X[n-1]) return puts("0"),0;
	qfac[0]=qinv[0]=pw[0]=1;pwpw[0]=2;
	for(int i=1;i<=n;i++) pw[i]=pw[i-1]*2%mod,pwpw[i]=pwpw[i-1]*pwpw[i-1]%mod;
	for(int i=1;i<=n;i++) qfac[i]=qfac[i-1]*(pw[i]-1)%mod;
	qinv[n]=power(qfac[n],mod-2);
	for(int i=n;i>=1;i--) qinv[i-1]=qinv[i]*(pw[i]-1)%mod;
	f[0][0]=g[0][1]=2;
	for(int i=1;i<=n;i++)
		for(int j=1;j<=i;j++)
			if(X[i-1])
			{
				upd(f[i][j],g[i-1][j]*pwpw[j-1]);
				upd(g[i][j],qC(i-1,j-1)*pw[i-j]%mod*pwpw[j-1]);
				upd(g[i][j],g[i-1][j]);
				upd(g[i][j+1],f[i][j]*pw[i-j]);
			}
			else
			{
				upd(f[i][j],g[i-1][j]);
				upd(g[i][j],g[i-1][j]);
				upd(g[i][j],qC(i-1,j-1)*pw[i-j]);
				upd(g[i][j+1],f[i][j]*pw[i-j]);
			}
	for(int i=1;i<=n;i++) ans[i]=(f[n][i]+qC(n-1,i)*pwpw[i])%mod;
	ans[0]=2;
	for(int i=1;i<=n;i++)
		for(int j=0;j<i;j++)
			ans[i]=(ans[i]+(mod-qC(n-j,i-j))*ans[j])%mod;
	cout<<(ll)ans[n]*_2%mod<<endl;
	return 0;
}

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 3ms
memory: 5540kb

input:

4 4
0001
0010
0100
1000
1101

output:

7364

result:

ok 1 number(s): "7364"

Test #2:

score: 0
Accepted
time: 2ms
memory: 5416kb

input:

3 2
00
00
00
11

output:

0

result:

ok 1 number(s): "0"

Test #3:

score: 0
Accepted
time: 2ms
memory: 5568kb

input:

2 3
110
101
101

output:

1

result:

ok 1 number(s): "1"

Test #4:

score: 0
Accepted
time: 0ms
memory: 5756kb

input:

3 10
1111100110
0011110100
0101100001
1110000001

output:

38

result:

ok 1 number(s): "38"

Test #5:

score: 0
Accepted
time: 1ms
memory: 5564kb

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: 0ms
memory: 6192kb

input:

100 100
1111010111010001011111110010101001001101000000000000011000001100101000100011100011000000110000001010
1001001110111010100100010111100010111110101100101000010111001011111010111100111000000011101010100111
000011010111000100110100010010011101001111100110111000100101010001101100101011000111101101...

output:

19562313

result:

ok 1 number(s): "19562313"

Test #7:

score: 0
Accepted
time: 3ms
memory: 8560kb

input:

400 500
1011011011010010111110101001010011000100001111000111111111001111100010101011110011010010011100100100111111000111001110111100101010000000100100011011011001011100100000000100001100001010100010111000110011000100101001010110110100110101000011011011011100111110010100101000011001100000001100001000...

output:

681985268

result:

ok 1 number(s): "681985268"

Test #8:

score: 0
Accepted
time: 45ms
memory: 16388kb

input:

999 1997
011101110101100100111101100000000100001110010001010100011010111010101101011100001000010001110100110111101101010111010011101111011001011100110110101011111011000111101011011000010101100101001110000111010101111100000100100101110000111001010101110110000001111111100110110011110100101000011100011...

output:

435150194

result:

ok 1 number(s): "435150194"

Test #9:

score: 0
Accepted
time: 84ms
memory: 31260kb

input:

1901 2000
10000111000111010000000000100110001100110010011001101110001011000001011000010111101110111001111000010110110100010100010101011111011101100111010101010001010010111010001011000001011010100011000101101010001110111100000101110110011001101111101111000100001010011101011110001100110001100000111110...

output:

9254020

result:

ok 1 number(s): "9254020"

Test #10:

score: 0
Accepted
time: 96ms
memory: 32264kb

input:

1984 2000
11111101001011101001011011010011000001100000101000001001111000100010011011000110110110100000001100000000001111101001111010111110000000010000000111111001010111101101110000111110010111001011011111010010110001011100110101000110000100010100100101010111101100000011110010010100101011101001110110...

output:

870006511

result:

ok 1 number(s): "870006511"

Test #11:

score: 0
Accepted
time: 64ms
memory: 3992kb

input:

2000 2000
00010001100000101100000110010101010101110010001000000100010010110010001100110000001110100111010110100110101010101111011100001110100011001000010001000011100111010100110101000111010010010111001001101100100000101001111111001111101001000101001011101001010010010101011110111001101101101001001000...

output:

0

result:

ok 1 number(s): "0"

Test #12:

score: 0
Accepted
time: 2ms
memory: 5736kb

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: 5988kb

input:

100 100
1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
0100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

output:

554554135

result:

ok 1 number(s): "554554135"

Test #14:

score: 0
Accepted
time: 11ms
memory: 16780kb

input:

1000 1000
10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

output:

944188930

result:

ok 1 number(s): "944188930"

Test #15:

score: 0
Accepted
time: 61ms
memory: 32492kb

input:

1999 1999
10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

output:

753324940

result:

ok 1 number(s): "753324940"

Test #16:

score: 0
Accepted
time: 46ms
memory: 32368kb

input:

2000 2000
10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

output:

489943678

result:

ok 1 number(s): "489943678"

Test #17:

score: 0
Accepted
time: 56ms
memory: 32024kb

input:

2000 2000
10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

output:

458543942

result:

ok 1 number(s): "458543942"

Test #18:

score: 0
Accepted
time: 2ms
memory: 5684kb

input:

37 100
0000000000100000010101011000010111111000000000000000000000000000000000001110100110101000000010110000
0111100011011110101011110100101001011000000000110010001010110100000000010000100000111011000000100000
0001110011110000001100011000010011001000000000000000000000000000000000000000000000000000010...

output:

807297668

result:

ok 1 number(s): "807297668"

Test #19:

score: 0
Accepted
time: 4ms
memory: 6136kb

input:

71 93
100010100111111001011100000000011001101101010001011001110001101110010000001000001000000000011
110100111110010001000110000101111010111111000111011010100001010000010110011000000100000000000
110010010110000000010001010100000011000100000010011100100000100100101100010100001100000010000
000101010010...

output:

50935767

result:

ok 1 number(s): "50935767"

Test #20:

score: 0
Accepted
time: 2ms
memory: 3512kb

input:

101 114
010101111101011101100001000100001001000100011100111111110010001111101001100100000110100101010110000000000000001000
101010000011100100000001100000110000111001111011000010010101001011110110100101011101111111111110111010000000000000
11011100100101010100101100000101100000010100000010010110101010...

output:

0

result:

ok 1 number(s): "0"

Test #21:

score: 0
Accepted
time: 3ms
memory: 5636kb

input:

17 2000
0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010010101111100001010111000001111010110101100011000011011111110001011001011010111110111110000110011101111011010110101011010100110001111110110110101000101110100110011001000010000001010...

output:

526829746

result:

ok 1 number(s): "526829746"

Test #22:

score: 0
Accepted
time: 2ms
memory: 5932kb

input:

30 1999
0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

output:

708057099

result:

ok 1 number(s): "708057099"

Test #23:

score: 0
Accepted
time: 0ms
memory: 5540kb

input:

54 2000
0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

output:

0

result:

ok 1 number(s): "0"

Test #24:

score: 0
Accepted
time: 27ms
memory: 14324kb

input:

791 1999
101011000010100101111110010001001001000000000001111100001000101100011110001010010011111110111010100011111010001110000001100010000011001110110011011011110110101100010010110111011000101111010100101110110010100011100100011001100000000001000001010100000000100111011000101111100100001000011010001...

output:

64451741

result:

ok 1 number(s): "64451741"

Test #25:

score: 0
Accepted
time: 25ms
memory: 15996kb

input:

944 2000
110101011100010000001010011011000001001001101001001011101110100000001000000010101011111001101010110100011101110100110010110000011100011111000001011110100111011101110010100100110111001110110001101010011101100010100100000010110101000101111000101110011000111000111111101110001101101110111110001...

output:

996119909

result:

ok 1 number(s): "996119909"

Test #26:

score: 0
Accepted
time: 36ms
memory: 18912kb

input:

1102 1999
10001010010010110101001000110000010000000110101001010111100100000110001111111100111001000111000111110100101101010110111110110001111011110101111001101100101110001011100001100000000000111111111000111010000111100010011010100001001011110111011110100001000100111000100001000010111001111011110001...

output:

855516290

result:

ok 1 number(s): "855516290"

Test #27:

score: 0
Accepted
time: 38ms
memory: 5840kb

input:

1931 2000
01101111100011101110100101000110011110000111000001010001011111010110011001111110110010111000100010111101001100001100001100010101000011001000110001011101111001000111101011011100011110010100001111111000101111000110000000000010110101110001000001011111001000001001100110101100100010101010010000...

output:

0

result:

ok 1 number(s): "0"

Test #28:

score: 0
Accepted
time: 86ms
memory: 31612kb

input:

1944 1999
10000110101111110110111101101000111110100010000011101101000011101100110000110001110000100000100101011111100100111000100110011111110111011100100000111000101110011100101011000011101101010001111110110100101101001011010011111111011111001101010000101011110010010110110101110000000111010100111101...

output:

52786402

result:

ok 1 number(s): "52786402"

Test #29:

score: 0
Accepted
time: 34ms
memory: 3980kb

input:

1977 2000
10011110110110110011001100011011011110111110001001101000101110100111011100011101001100100101110101010001100011001110111011101101100010000010100010001011011011001111011010111011100010101010101111101100001000111011100010111000000101111110100001111011111111111111110101101001101001111100011100...

output:

0

result:

ok 1 number(s): "0"

Test #30:

score: 0
Accepted
time: 120ms
memory: 32640kb

input:

2000 2000
01110010111000111001110000110111011110010010111001000001100101101011000001010111111010001100110000101001001000000000011001101101010001010011010000111011111101001110110010110101110101100100000011110100100010110001110010101001000110100100001001001111000111001011110110101100101011011011101010...

output:

3964016

result:

ok 1 number(s): "3964016"

Test #31:

score: 0
Accepted
time: 46ms
memory: 4124kb

input:

1994 1999
00001100011011001011110111100001111001010110101100010010111001011000100111011110000010100111100001101101100000101111101111001001011001000111111011010110001111001100110000100001101001011001001011100101000101010000110001101000100110110010011010000001000110001010101101111100010110001010101000...

output:

0

result:

ok 1 number(s): "0"

Test #32:

score: 0
Accepted
time: 45ms
memory: 4160kb

input:

1997 2000
01111000101001101011000100101111110000011100111100101100111100110000100101010001011110111100101000001001000110100110111101011101010100010110101011010010000100000110011111100000100011000110001110000111011010110001001001000001110101011011011000101111010000010101101111110100110011110100101000...

output:

0

result:

ok 1 number(s): "0"

Test #33:

score: 0
Accepted
time: 111ms
memory: 32440kb

input:

2000 2000
00110111110110101110100001011000000101001011010011111001100000001001101100111111100001100010111101001110101001101010111011111000000110101101101110100111110101111110010000001001010100111101011010100000010001110100100010010100101010100110011101011110111100111110101110111010010111010010100010...

output:

385756366

result:

ok 1 number(s): "385756366"

Test #34:

score: 0
Accepted
time: 93ms
memory: 32212kb

input:

1988 1999
10101010110010100000101100110010001110101111010010001011010100100010101111001010100110100101100100111101000001000110001011110000001110000000110000001111000100101100000000111011011011110111101000001110111111000110011011111011010000010011100010010110111010000011010001011100010001011001100000...

output:

534584509

result:

ok 1 number(s): "534584509"

Test #35:

score: 0
Accepted
time: 65ms
memory: 5764kb

input:

2000 2000
00100000011001010111100000100001011101010011001010100100100001100000000100010110000110010111010000100110010000010001110100010100111001000110111001011101101110111000000111000000111101011010000110010011110011010000010101000111100100100001101001100010101101011111001010001011101001100001011010...

output:

0

result:

ok 1 number(s): "0"

Test #36:

score: 0
Accepted
time: 48ms
memory: 3944kb

input:

1995 2000
10010000010101100111011100110001101101000100010011110100110111110000000111010000111101011000101000111000010010010111000010101110110100011100111010110110110100111101010100000110001010010001011001000100011110101100110111010110101010100100011010101100001010111111000100101110001101000000010010...

output:

0

result:

ok 1 number(s): "0"

Test #37:

score: 0
Accepted
time: 87ms
memory: 32328kb

input:

1999 1999
11011110110011001100010110011001000101010101001001010101111111000111100000001101101101101010001111010000011101100110100111011010011011001101010011001100011111010100001000100100100111010111001000000010101100100010001111100100101110100010010010101000000110101011101001110010111111011101000101...

output:

678369480

result:

ok 1 number(s): "678369480"

Test #38:

score: 0
Accepted
time: 46ms
memory: 3964kb

input:

1999 2000
11000110010001011100111010011110110100101101000010111101001010100000100100011101011000110000101011011111110101001101111010010010010001011110101001010000010100110110100110011110011101001100000001110100001100110111011001110000110110000101110011110010110100110011010111011001011010111000000110...

output:

0

result:

ok 1 number(s): "0"