QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#830862 | #7. 主旋律 | Crying | 100 ✓ | 858ms | 3976kb | C++14 | 1.4kb | 2024-12-24 23:49:54 | 2024-12-24 23:50:01 |
Judging History
answer
#include<bits/stdc++.h>
#define lowbit(x) (x&(-x))
using namespace std;
typedef long long ll;
const int N = 15,M = 300,mod = 1e9+7;
int addv(int x,int y){return (x+y>=mod)?(x+y-mod):(x+y);}
int subv(int x,int y){return (x>=y)?(x-y):(x-y+mod);}
void add(int& x,int y){x = addv(x,y);}
void sub(int& x,int y){x = subv(x,y);}
int qpow(int a,int n){
int res = 1; a%=mod;
while(n){
if(n&1)res = 1ll*res*a%mod;
n>>=1; a = 1ll*a*a%mod;
}
return res;
}
int qinv(int a){return qpow(a,mod-2);}
//
int n,m,U,pw[M],e[N][N],to[N];
int cnt[1<<N];
int f[1<<N],g[1<<N];
int main(){
cin>>n>>m; U = (1<<n)-1;
pw[0] = 1; for(int i=1;i<=m;i++)pw[i] = 2ll*pw[i-1]%mod;
for(int i=1,u,v;i<=m;i++){
cin>>u>>v; u--,v--;
e[u][v] = 1;
to[u] |= 1<<v;
}
for(int S=1;S<=U;S++)for(int x=0;x<n;x++)for(int y=0;y<n;y++)if((S>>x&1) && (S>>y&1))cnt[S] += e[x][y];
g[0] = (mod-1);
for(int S=1;S<=U;S++){
for(int T=S;T;T=(T-1)&S)if(T&lowbit(S))sub(g[S],1ll*g[S^T]*f[T]%mod);
for(int T=S;T;T=(T-1)&S){
int R = S^T,num = cnt[R];
for(int x=0;x<n;x++)if(T>>x&1)num += __builtin_popcount(to[x]&R);
int w = 1ll*g[T]*pw[num]%mod;
add(f[S],w);
}
f[S] = subv(pw[cnt[S]],f[S]);
add(g[S],f[S]);
}
cout<<f[U]<<endl;
return 0;
}
Details
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Pretests
Final Tests
Test #1:
score: 10
Accepted
time: 0ms
memory: 3600kb
input:
5 15 4 3 4 2 2 5 2 1 1 2 5 1 3 2 4 1 1 4 5 4 3 4 5 3 2 3 1 5 3 1
output:
9390
result:
ok single line: '9390'
Test #2:
score: 10
Accepted
time: 0ms
memory: 3608kb
input:
5 18 4 3 4 2 2 5 2 1 1 2 5 1 3 2 4 1 1 4 5 4 3 4 5 3 2 3 1 5 3 1 1 3 5 2 2 4
output:
100460
result:
ok single line: '100460'
Test #3:
score: 10
Accepted
time: 1ms
memory: 3828kb
input:
8 35 5 1 8 7 7 8 7 6 6 1 2 5 6 5 8 2 7 2 7 5 3 1 6 3 2 3 5 2 8 5 8 3 6 8 2 1 1 6 2 6 7 3 2 4 3 5 3 2 3 7 7 1 8 4 3 4 3 6 6 4 2 7 4 6 6 7 7 4 8 1
output:
299463717
result:
ok single line: '299463717'
Test #4:
score: 10
Accepted
time: 1ms
memory: 3572kb
input:
8 40 5 1 8 7 7 8 7 6 6 1 2 5 6 5 8 2 7 2 7 5 3 1 6 3 2 3 5 2 8 5 8 3 6 8 2 1 1 6 2 6 7 3 2 4 3 5 3 2 3 7 7 1 8 4 3 4 3 6 6 4 2 7 4 6 6 7 7 4 8 1 1 2 4 8 5 8 4 3 5 7
output:
21156439
result:
ok single line: '21156439'
Test #5:
score: 10
Accepted
time: 0ms
memory: 3832kb
input:
8 45 5 1 8 7 7 8 7 6 6 1 2 5 6 5 8 2 7 2 7 5 3 1 6 3 2 3 5 2 8 5 8 3 6 8 2 1 1 6 2 6 7 3 2 4 3 5 3 2 3 7 7 1 8 4 3 4 3 6 6 4 2 7 4 6 6 7 7 4 8 1 1 2 4 8 5 8 4 3 5 7 2 8 1 5 3 8 1 3 4 1
output:
426670664
result:
ok single line: '426670664'
Test #6:
score: 10
Accepted
time: 3ms
memory: 3620kb
input:
10 65 5 10 1 8 7 8 6 2 5 7 9 2 4 7 3 7 1 6 3 10 7 9 8 4 7 1 5 2 1 7 4 2 8 3 8 1 3 9 8 2 2 10 4 3 9 10 5 3 3 8 3 4 6 10 4 8 4 5 5 8 9 5 9 6 10 2 10 5 6 1 2 1 9 4 7 10 5 6 10 7 10 8 5 9 9 7 9 8 4 10 8 9 7 2 2 7 10 1 7 3 6 8 7 6 9 1 6 5 2 4 6 3 2 9 8 10 10 9 8 5 4 1 6 9 2 3 1 3 1 9
output:
931896041
result:
ok single line: '931896041'
Test #7:
score: 10
Accepted
time: 3ms
memory: 3500kb
input:
10 70 5 10 1 8 7 8 6 2 5 7 9 2 4 7 3 7 1 6 3 10 7 9 8 4 7 1 5 2 1 7 4 2 8 3 8 1 3 9 8 2 2 10 4 3 9 10 5 3 3 8 3 4 6 10 4 8 4 5 5 8 9 5 9 6 10 2 10 5 6 1 2 1 9 4 7 10 5 6 10 7 10 8 5 9 9 7 9 8 4 10 8 9 7 2 2 7 10 1 7 3 6 8 7 6 9 1 6 5 2 4 6 3 2 9 8 10 10 9 8 5 4 1 6 9 2 3 1 3 1 9 5 4 1 5 5 1 10 4 10 6
output:
303656759
result:
ok single line: '303656759'
Test #8:
score: 10
Accepted
time: 856ms
memory: 3976kb
input:
15 130 7 10 9 12 4 6 1 10 14 9 4 8 8 9 4 3 15 9 3 9 1 8 2 15 8 4 13 7 3 5 14 13 6 2 14 6 8 3 4 2 8 13 9 2 6 13 12 11 6 4 11 8 15 5 3 8 10 8 15 7 15 6 12 15 8 12 13 9 12 9 8 15 11 6 6 7 10 4 2 8 11 12 7 9 7 12 14 1 5 8 10 9 3 7 7 13 11 9 11 10 1 5 1 3 2 1 2 7 10 1 10 15 7 14 5 6 6 1 15 10 5 15 15 8 5...
output:
717458968
result:
ok single line: '717458968'
Test #9:
score: 10
Accepted
time: 842ms
memory: 3972kb
input:
15 140 7 10 9 12 4 6 1 10 14 9 4 8 8 9 4 3 15 9 3 9 1 8 2 15 8 4 13 7 3 5 14 13 6 2 14 6 8 3 4 2 8 13 9 2 6 13 12 11 6 4 11 8 15 5 3 8 10 8 15 7 15 6 12 15 8 12 13 9 12 9 8 15 11 6 6 7 10 4 2 8 11 12 7 9 7 12 14 1 5 8 10 9 3 7 7 13 11 9 11 10 1 5 1 3 2 1 2 7 10 1 10 15 7 14 5 6 6 1 15 10 5 15 15 8 5...
output:
459157220
result:
ok single line: '459157220'
Test #10:
score: 10
Accepted
time: 858ms
memory: 3976kb
input:
15 150 7 10 9 12 4 6 1 10 14 9 4 8 8 9 4 3 15 9 3 9 1 8 2 15 8 4 13 7 3 5 14 13 6 2 14 6 8 3 4 2 8 13 9 2 6 13 12 11 6 4 11 8 15 5 3 8 10 8 15 7 15 6 12 15 8 12 13 9 12 9 8 15 11 6 6 7 10 4 2 8 11 12 7 9 7 12 14 1 5 8 10 9 3 7 7 13 11 9 11 10 1 5 1 3 2 1 2 7 10 1 10 15 7 14 5 6 6 1 15 10 5 15 15 8 5...
output:
663282473
result:
ok single line: '663282473'