QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#501581 | #8047. DFS Order 4 | Williamxzh | AC ✓ | 492ms | 8700kb | C++23 | 1.1kb | 2024-08-02 21:00:48 | 2024-08-02 21:00:49 |
Judging History
answer
#include <bits/stdc++.h>
#define il inline
using namespace std;
typedef long long ll;ll mod;
il void add(ll &x,ll y){x=(x+y>=mod?x+y-mod:x+y);}
il void del(ll &x,ll y){x=(x<y?x-y+mod:x-y);}
il ll qp(ll a,ll b){
ll ans=1ll;
while(b){
if(b&1) ans=(ans*a)%mod;
a=(a*a)%mod,b>>=1;
}return ans;
}
const int N=803;
int n;ll f[N][N],fac[N],inv[N];
il void init(){
fac[0]=1ll;for(int i=1;i<=n;++i) fac[i]=(fac[i-1]*1ll*i)%mod;
for(int i=1;i<=n;++i) inv[i]=qp(i,mod-2ll);
}
int main(){
//freopen("qoj8047_0.in","r",stdin);
scanf("%d%lld",&n,&mod);init();if(n<=1){printf("1");exit(0);}
f[1][0]=1ll;
for(int i=2;i<n;++i)
for(int k=0;k<=i;++k){
f[i][k]=f[i-1][k+1];
if(!k) add(f[i][0],f[i-1][0]);
for(int j=1;j<=i-k;++j){
add(f[i][k],f[j-1][0]*f[i-j][k]%mod);
if(k) del(f[i][k],(f[j-1][0]+(j==1))*f[i-j][k-1]%mod);
}
f[i][k]=(f[i][k]*inv[i])%mod;
}
printf("%lld",f[n-1][0]*fac[n-1]%mod);
return 0;
}
这程序好像有点Bug,我给组数据试试?
Details
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Test #1:
score: 100
Accepted
time: 0ms
memory: 3968kb
input:
4 114514199
output:
2
result:
ok 1 number(s): "2"
Test #2:
score: 0
Accepted
time: 0ms
memory: 3856kb
input:
10 998244353
output:
11033
result:
ok 1 number(s): "11033"
Test #3:
score: 0
Accepted
time: 2ms
memory: 6264kb
input:
100 1000000007
output:
270904395
result:
ok 1 number(s): "270904395"
Test #4:
score: 0
Accepted
time: 441ms
memory: 8120kb
input:
756 1001338769
output:
901942543
result:
ok 1 number(s): "901942543"
Test #5:
score: 0
Accepted
time: 476ms
memory: 8644kb
input:
793 1009036033
output:
301770320
result:
ok 1 number(s): "301770320"
Test #6:
score: 0
Accepted
time: 421ms
memory: 8628kb
input:
759 1005587659
output:
846376219
result:
ok 1 number(s): "846376219"
Test #7:
score: 0
Accepted
time: 444ms
memory: 8420kb
input:
773 1007855479
output:
1398019
result:
ok 1 number(s): "1398019"
Test #8:
score: 0
Accepted
time: 407ms
memory: 8408kb
input:
751 1006730639
output:
321287237
result:
ok 1 number(s): "321287237"
Test #9:
score: 0
Accepted
time: 454ms
memory: 8544kb
input:
778 1007760653
output:
430322899
result:
ok 1 number(s): "430322899"
Test #10:
score: 0
Accepted
time: 489ms
memory: 8660kb
input:
798 1007543827
output:
688720826
result:
ok 1 number(s): "688720826"
Test #11:
score: 0
Accepted
time: 487ms
memory: 8552kb
input:
796 1004841413
output:
258829347
result:
ok 1 number(s): "258829347"
Test #12:
score: 0
Accepted
time: 448ms
memory: 8536kb
input:
775 1005185189
output:
744278608
result:
ok 1 number(s): "744278608"
Test #13:
score: 0
Accepted
time: 492ms
memory: 8700kb
input:
800 1006012831
output:
508549367
result:
ok 1 number(s): "508549367"
Test #14:
score: 0
Accepted
time: 0ms
memory: 3744kb
input:
1 1001338769
output:
1
result:
ok 1 number(s): "1"
Test #15:
score: 0
Accepted
time: 0ms
memory: 3808kb
input:
2 1001338769
output:
1
result:
ok 1 number(s): "1"
Test #16:
score: 0
Accepted
time: 0ms
memory: 3924kb
input:
9 1009036033
output:
1780
result:
ok 1 number(s): "1780"
Test #17:
score: 0
Accepted
time: 0ms
memory: 3860kb
input:
14 1001338769
output:
43297358
result:
ok 1 number(s): "43297358"
Extra Test:
score: 0
Extra Test Passed