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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
#838672#9561. 树数叔术Crying100 ✓490ms3932kbC++141.4kb2024-12-31 17:52:012024-12-31 17:52:02

Judging History

你现在查看的是最新测评结果

  • [2024-12-31 17:52:02]
  • 评测
  • 测评结果:100
  • 用时:490ms
  • 内存:3932kb
  • [2024-12-31 17:52:01]
  • 提交

answer

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N = 160; int mod;
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 n,m,C[N][N];

int f[2][N][N];

int main(){
    cin>>n>>m>>mod;
    m++; if(m > n){cout<<"0\n"; return 0;}

    for(int i=0;i<=n;i++){
        C[i][0] = 1; 
        for(int j=1;j<=i;j++)C[i][j] = addv(C[i-1][j-1],C[i-1][j]);
    }
    //
    f[1][1][0] = 1;
    for(int i=2;i<=m;i++){
        int q = i&1,p = q^1;
        memset(f[q],0,sizeof f[q]);
        for(int x=1;x<=n;x++)for(int y=0;y<=x;y++){
            int w = f[p][x][y]; if(!w)continue;
            sub(f[q][x][y],w);
            //case1. 拓展一个新点
            add(f[q][x+1][y],1ll*w*x%mod);
            add(f[q][x+2][y+1],1ll*w*(x-1)%mod);
            //case2. 在当前的树上修改
            //if(x==3 && y==0)continue;
            for(int c=0;c<=y;c++){
                int nw = 1ll*w*C[y][c]%mod;
                add(f[q][x][y-c],nw);
                if(x==1)continue;
                for(int z=1;x+z<=n;z++){
                    add(f[q][x+z][y-c],1ll*nw*C[x+z-2][z]%mod);
                }
            }
        }

    } 
    int ans = f[m&1][n][0];
    for(int i=2;i<=n;i++)ans = 1ll*ans*i%mod;
    cout<<ans<<endl;

    return 0;
}

详细

Subtask #1:

score: 5
Accepted

Test #1:

score: 5
Accepted
time: 0ms
memory: 3476kb

input:

1 1 624295285

output:

0

result:

ok single line: '0'

Test #2:

score: 5
Accepted
time: 0ms
memory: 3648kb

input:

4 684813415 564954712

output:

0

result:

ok single line: '0'

Test #3:

score: 5
Accepted
time: 0ms
memory: 3736kb

input:

4 2 844826878

output:

24

result:

ok single line: '24'

Test #4:

score: 5
Accepted
time: 0ms
memory: 3496kb

input:

4 17724073 252218682

output:

0

result:

ok single line: '0'

Test #5:

score: 5
Accepted
time: 0ms
memory: 3732kb

input:

4 3 697681963

output:

384

result:

ok single line: '384'

Subtask #2:

score: 15
Accepted

Test #6:

score: 15
Accepted
time: 0ms
memory: 3832kb

input:

6 4 956647977

output:

238320

result:

ok single line: '238320'

Test #7:

score: 15
Accepted
time: 0ms
memory: 3640kb

input:

6 450615260 491361886

output:

0

result:

ok single line: '0'

Test #8:

score: 15
Accepted
time: 0ms
memory: 3748kb

input:

6 5 339344353

output:

933120

result:

ok single line: '933120'

Test #9:

score: 15
Accepted
time: 0ms
memory: 3840kb

input:

6 3 842228619

output:

23760

result:

ok single line: '23760'

Test #10:

score: 15
Accepted
time: 0ms
memory: 3892kb

input:

6 5 331699652

output:

933120

result:

ok single line: '933120'

Subtask #3:

score: 30
Accepted

Test #11:

score: 30
Accepted
time: 0ms
memory: 3868kb

input:

48 26 424594716

output:

362283012

result:

ok single line: '362283012'

Test #12:

score: 30
Accepted
time: 0ms
memory: 3548kb

input:

49 1000000000 738885247

output:

0

result:

ok single line: '0'

Test #13:

score: 30
Accepted
time: 2ms
memory: 3768kb

input:

48 39 688951620

output:

598399200

result:

ok single line: '598399200'

Test #14:

score: 30
Accepted
time: 0ms
memory: 3544kb

input:

50 476039414 292870080

output:

0

result:

ok single line: '0'

Test #15:

score: 30
Accepted
time: 3ms
memory: 3772kb

input:

50 48 245196368

output:

123576912

result:

ok single line: '123576912'

Subtask #4:

score: 50
Accepted

Test #16:

score: 50
Accepted
time: 0ms
memory: 3540kb

input:

150 526250070 197316869

output:

0

result:

ok single line: '0'

Test #17:

score: 50
Accepted
time: 472ms
memory: 3932kb

input:

149 116 671784452

output:

18945228

result:

ok single line: '18945228'

Test #18:

score: 50
Accepted
time: 429ms
memory: 3828kb

input:

146 144 906402626

output:

438777234

result:

ok single line: '438777234'

Test #19:

score: 50
Accepted
time: 444ms
memory: 3832kb

input:

147 143 705666477

output:

70408701

result:

ok single line: '70408701'

Test #20:

score: 50
Accepted
time: 490ms
memory: 3824kb

input:

150 147 453481175

output:

336290325

result:

ok single line: '336290325'