QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#720524 | #8047. DFS Order 4 | qzez# | TL | 1990ms | 6168kb | C++14 | 1.5kb | 2024-11-07 13:08:13 | 2024-11-07 13:08:14 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
using ll=long long;
#ifdef DEBUG
template<class T>
ostream& operator << (ostream& out,vector<T>a){
out<<'[';
for(auto x:a)out<<x<<',';
return out<<']';
}
template<class T>
auto ary(T *a,int l,int r){
return vector<T>{a+l,a+1+r};
}
template<class T>
void debug(T x){
cerr<<x<<endl;
}
template<class T,class...S>
void debug(T x,S...y){
cerr<<x<<' ',debug(y...);
}
#else
#define debug(...) void()
#endif
const int N=805;
int n,mod,f[N][N],fac[N],inv[N];
int main(){
cin>>n>>mod;
inv[1]=1;
for(int i=2;i<=n;i++)inv[i]=1ll*inv[mod%i]*(mod-mod/i)%mod;
for(int i=fac[0]=1;i<=n;i++)fac[i]=1ll*fac[i-1]*i%mod;
// f[1][1]=1;
f[0][0]=1;
for(int i=1;i<=n;i++){
for(int j=1;j<=i;j++){
f[i][j]=(f[i][j]+f[i-1][j-1])%mod;
for(int k=1;k<=i-1;k++){
// if(i==3&&j==1)debug("A",f[k][1],f[i-1-k][j-1]);
f[i][j]=(f[i][j]+1ll*f[k][1]*f[i-1-k][j-1])%mod;
}
for(int k=1;k<i-1;k++){
// if(i==3&&j==1)debug("B",f[k][1],f[i-1-k][j]);
f[i][j]=(f[i][j]+1ll*f[k][1]*f[i-1-k][j])%mod;
}
// if(i==3&&j==1)debug("C",-f[i-1][j+1]);
(f[i][j]+=mod-f[i-1][j+1])%=mod;
f[i][j]=1ll*f[i][j]*inv[i]%mod;
// debug(i,j,1ll*f[i][j]*fac[i]%mod);
}
}
int ans=1ll*f[n-1][1]*fac[n-1]%mod;
cout<<ans<<endl;
return 0;
}
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 0ms
memory: 3712kb
input:
4 114514199
output:
2
result:
ok 1 number(s): "2"
Test #2:
score: 0
Accepted
time: 0ms
memory: 3668kb
input:
10 998244353
output:
11033
result:
ok 1 number(s): "11033"
Test #3:
score: 0
Accepted
time: 4ms
memory: 4012kb
input:
100 1000000007
output:
270904395
result:
ok 1 number(s): "270904395"
Test #4:
score: 0
Accepted
time: 1723ms
memory: 5920kb
input:
756 1001338769
output:
901942543
result:
ok 1 number(s): "901942543"
Test #5:
score: 0
Accepted
time: 1990ms
memory: 6168kb
input:
793 1009036033
output:
301770320
result:
ok 1 number(s): "301770320"
Test #6:
score: 0
Accepted
time: 1744ms
memory: 6012kb
input:
759 1005587659
output:
846376219
result:
ok 1 number(s): "846376219"
Test #7:
score: 0
Accepted
time: 1843ms
memory: 5980kb
input:
773 1007855479
output:
1398019
result:
ok 1 number(s): "1398019"
Test #8:
score: 0
Accepted
time: 1694ms
memory: 5980kb
input:
751 1006730639
output:
321287237
result:
ok 1 number(s): "321287237"
Test #9:
score: 0
Accepted
time: 1875ms
memory: 6000kb
input:
778 1007760653
output:
430322899
result:
ok 1 number(s): "430322899"
Test #10:
score: -100
Time Limit Exceeded
input:
798 1007543827
output:
688720826