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QOJ
ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
---|---|---|---|---|---|---|---|---|---|
#838467 | #9561. 树数叔术 | eastcloud | 100 ✓ | 81ms | 4068kb | C++23 | 2.6kb | 2024-12-31 11:54:03 | 2024-12-31 11:54:07 |
Judging History
answer
#include<bits/stdc++.h>
#define ll long long
#define pi pair<int,int>
#define vi vector<int>
#define cpy(x,y,s) memcpy(x,y,sizeof(x[0])*(s))
#define mset(x,v,s) memset(x,v,sizeof(x[0])*(s))
#define all(x) begin(x),end(x)
#define fi first
#define se second
#define mp make_pair
#define pb push_back
#define ary array
#define eb emplace_back
#define IL inline
#define For(i,j,k) for(int i=(j);i<=(k);i++)
#define Fol(i,k,j) for(int i=(k);i>=(j);i--)
using namespace std;
#define N 152
int read(){
int x=0,f=1;char ch=getchar();
while(ch<'0' || ch>'9')f=(ch=='-'?-1:f),ch=getchar();
while(ch>='0' && ch<='9')x=(x<<1)+(x<<3)+(ch^48),ch=getchar();
return x*f;
}
void write(int x){
if(x<0)x=-x,putchar('-');
if(x/10)write(x/10);
putchar(x%10+'0');
}
void debug(auto &&...x){
((cerr<<x<<' '),...);
cerr<<'\n';
}
int mod;
IL int pls(int x,int y){return (x+y>=mod?x+y-mod:x+y);}
IL int sub(int x,int y){return (x-y<0?x-y+mod:x-y);}
IL void Add(int &x,int y){x=pls(x,y);}
IL void Dec(int &x,int y){x=sub(x,y);}
IL int mul(int x,int y){return x*1ll*y%mod;}
IL int qp(int x,int y=mod-2){int ans=1;while(y){if(y&1)ans=mul(ans,x);x=mul(x,x);y>>=1;}return ans;}
int fac[N];
IL void init(){
fac[0]=1;
for(int i=1;i<N;i++)fac[i]=mul(fac[i-1],i);
}
int f[2][N][N];//虚树大小和空点数量
int g[2][N][N],C[N][N];
int main(){
#ifdef EAST_CLOUD
freopen("a.in","r",stdin);
//freopen("a.out","w",stdout);
#endif
int n=read(),V=read();mod=read();init();
if(V>=n){write(0);return 0;}
f[0][1][0]=1;C[1][0]=C[1][1]=C[0][0]=1;
For(i,2,N-1){
C[i][0]=1;
For(j,1,N-1)C[i][j]=pls(C[i-1][j-1],C[i-1][j]);
}
For(i,0,V-1){
int cur=(i&1),nex=((i&1)^1);
For(j,0,n)For(k,0,n){
if(!f[cur][j][k])continue;
//debug(i,j,k,f[cur][j][k]);
if(j+1<=n)Add(f[nex][j+1][k],mul(f[cur][j][k],j));
if(j+2<=n)Add(f[nex][j+2][k+1],mul(f[cur][j][k],j-1));
For(l,0,k)Add(g[(l?1:0)][j][k-l],mul(C[k][l],f[cur][j][k]));
f[cur][j][k]=0;
}
For(op,0,1)For(j,0,n)For(k,0,n){
if(!g[op][j][k])continue;
if(j==1){
if(op)Add(f[nex][j][k],g[op][j][k]);
g[op][j][k]=0;continue;
}
For(l,(op?0:1),n){
if(j+l<=n)Add(f[nex][j+l][k],mul(g[op][j][k],C[l+j-2][j-2]));
else break;
}
g[op][j][k]=0;
}
}
write(mul(f[(V)&1][n][0],fac[n]));
return 0;
}
详细
Subtask #1:
score: 5
Accepted
Test #1:
score: 5
Accepted
time: 0ms
memory: 3612kb
input:
1 1 624295285
output:
0
result:
ok single line: '0'
Test #2:
score: 5
Accepted
time: 0ms
memory: 3480kb
input:
4 684813415 564954712
output:
0
result:
ok single line: '0'
Test #3:
score: 5
Accepted
time: 0ms
memory: 3644kb
input:
4 2 844826878
output:
24
result:
ok single line: '24'
Test #4:
score: 5
Accepted
time: 0ms
memory: 3640kb
input:
4 17724073 252218682
output:
0
result:
ok single line: '0'
Test #5:
score: 5
Accepted
time: 1ms
memory: 3660kb
input:
4 3 697681963
output:
384
result:
ok single line: '384'
Subtask #2:
score: 15
Accepted
Test #6:
score: 15
Accepted
time: 0ms
memory: 3652kb
input:
6 4 956647977
output:
238320
result:
ok single line: '238320'
Test #7:
score: 15
Accepted
time: 0ms
memory: 3544kb
input:
6 450615260 491361886
output:
0
result:
ok single line: '0'
Test #8:
score: 15
Accepted
time: 0ms
memory: 3808kb
input:
6 5 339344353
output:
933120
result:
ok single line: '933120'
Test #9:
score: 15
Accepted
time: 0ms
memory: 3788kb
input:
6 3 842228619
output:
23760
result:
ok single line: '23760'
Test #10:
score: 15
Accepted
time: 0ms
memory: 3660kb
input:
6 5 331699652
output:
933120
result:
ok single line: '933120'
Subtask #3:
score: 30
Accepted
Test #11:
score: 30
Accepted
time: 1ms
memory: 3840kb
input:
48 26 424594716
output:
362283012
result:
ok single line: '362283012'
Test #12:
score: 30
Accepted
time: 0ms
memory: 3684kb
input:
49 1000000000 738885247
output:
0
result:
ok single line: '0'
Test #13:
score: 30
Accepted
time: 1ms
memory: 3756kb
input:
48 39 688951620
output:
598399200
result:
ok single line: '598399200'
Test #14:
score: 30
Accepted
time: 0ms
memory: 3532kb
input:
50 476039414 292870080
output:
0
result:
ok single line: '0'
Test #15:
score: 30
Accepted
time: 2ms
memory: 3832kb
input:
50 48 245196368
output:
123576912
result:
ok single line: '123576912'
Subtask #4:
score: 50
Accepted
Test #16:
score: 50
Accepted
time: 0ms
memory: 3548kb
input:
150 526250070 197316869
output:
0
result:
ok single line: '0'
Test #17:
score: 50
Accepted
time: 81ms
memory: 3988kb
input:
149 116 671784452
output:
18945228
result:
ok single line: '18945228'
Test #18:
score: 50
Accepted
time: 76ms
memory: 4068kb
input:
146 144 906402626
output:
438777234
result:
ok single line: '438777234'
Test #19:
score: 50
Accepted
time: 80ms
memory: 3932kb
input:
147 143 705666477
output:
70408701
result:
ok single line: '70408701'
Test #20:
score: 50
Accepted
time: 80ms
memory: 4004kb
input:
150 147 453481175
output:
336290325
result:
ok single line: '336290325'