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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 |
---|---|---|---|---|---|---|---|---|---|
#367203 | #5139. DFS Order 2 | Baiyu0123 | WA | 187ms | 28508kb | C++14 | 2.2kb | 2024-03-25 20:12:54 | 2024-03-25 20:12:54 |
Judging History
answer
#include<bits/stdc++.h>
#define ll long long
using namespace std;
const int maxn=505,mod=998244353;
vector<int> ed[maxn];
int d[maxn],siz[maxn],n;
int sum[maxn*2],g[maxn][maxn][maxn];
int f[maxn][maxn];
int fac[maxn],inv[maxn];
void lj(int x,int y) {
ed[x].push_back(y);
ed[y].push_back(x);
}
void init_dfs(int fa,int u) {
d[u]=ed[u].size();siz[u]=1;
for (int i=0;i<ed[u].size();i++) {
if (ed[u][i]==fa) {
for (int j=i+1;j<ed[u].size();j++) {
ed[u][j-1]=ed[u][j];
}
d[u]--;
break;
}
}
for (int i=1;i<=d[u];i++) {
int v=ed[u][i-1];
init_dfs(u,v);
siz[u]+=siz[v];
}
}
void add(int &x,int y) {
x=(x+y)%mod;
}
void output(int f[][maxn]) {
for (int i=1;i<=n;i++) {
for (int j=1;j<=n;j++) {
cout<<f[i][j]<<" ";
}
cout<<endl;
}
cout<<endl;
}
void getans(int u,int l,int r,int w) {
for (int i=l;i<=r;i++) {
int v=ed[u][i-1];
for (int p=sum[w];p>=0;p--) {
for (int j=d[u]-1;j>=0;j--) {
add(g[w][p+siz[v]][j+1],g[w][p][j]);
}
}
sum[w]+=siz[v];
}
}
int tot=0;
void calc(int u,int l,int r,int w) {
if (l==r) {
int v=ed[u][l-1];
for (int k=1;k<=n-siz[u]+1;k++) {
for (int p=1;p<=siz[u]-1;p++) {
for (int j=0;j<=d[u]-1;j++) {
add(f[v][k+p],
1ll*f[u][k]*g[w][p-1][j]%mod*fac[j]%mod*fac[d[u]-j-1]%mod*inv[d[u]]%mod);
}
}
}
return ;
}
int mid=(l+r)>>1,rw=++tot;
memcpy(g[rw],g[w],sizeof(g[w]));sum[rw]=sum[w];
getans(u,mid+1,r,w);
getans(u,l,mid,rw);
calc(u,l,mid,w);
calc(u,mid+1,r,rw);
}
void dfs(int fa,int u) {
if (d[u]==0) return;
g[1][0][0]=1;tot=1;
calc(u,1,d[u],1);
for (int i=1;i<=tot;i++) memset(g[i],0,sizeof(g[i]));
for (int i=1;i<=d[u];i++) {
int v=ed[u][i-1];
dfs(u,v);
}
}
int qpow(int x,int y) {
ll ret=1,bas=x;
while (y) {
if (y&1) ret=ret*bas%mod;
bas=bas*bas%mod;
y>>=1;
}
return ret;
}
int main() {
ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
cin>>n;
fac[0]=1;
for (int i=1;i<=n;i++) fac[i]=1ll*fac[i-1]*i%mod;
for (int i=0;i<=n;i++) inv[i]=qpow(fac[i],mod-2);
for (int l=2;l<=n;l++) {
int x,y;cin>>x>>y;
lj(x,y);
}
init_dfs(1,1);
f[1][1]=1;
for (int i=1;i<=n;i++) f[1][1]=1ll*f[1][1]*fac[d[i]]%mod;
dfs(1,1);
output(f);
}
详细
Test #1:
score: 100
Accepted
time: 1ms
memory: 7720kb
input:
5 1 2 1 3 3 4 3 5
output:
4 0 0 0 0 0 2 0 0 2 0 2 2 0 0 0 0 1 2 1 0 0 1 2 1
result:
ok 25 numbers
Test #2:
score: 0
Accepted
time: 0ms
memory: 7812kb
input:
10 9 2 9 6 10 5 1 5 1 6 9 3 5 8 4 3 7 9
output:
24 0 0 0 0 0 0 0 0 0 0 0 0 4 2 2 8 2 2 4 0 0 0 4 4 4 4 4 4 0 0 0 0 0 4 4 4 4 4 4 0 12 0 0 0 0 0 12 0 0 0 12 0 0 12 0 0 0 0 0 0 0 0 4 2 2 8 2 2 4 0 0 6 6 0 0 0 0 6 6 0 0 12 0 0 12 0 0 0 0 0 0 6 6 0 0 0 0 6 6
result:
ok 100 numbers
Test #3:
score: 0
Accepted
time: 8ms
memory: 8096kb
input:
100 18 100 91 87 28 83 11 98 51 52 24 91 72 53 18 19 89 16 77 35 26 25 73 16 96 70 56 44 69 10 63 30 54 95 39 66 58 98 8 71 58 65 74 73 2 64 12 19 32 81 31 54 43 41 84 59 55 75 72 81 59 37 10 94 93 2 64 47 13 32 36 84 28 22 30 28 25 77 47 6 80 52 54 17 23 40 47 88 49 53 65 27 99 59 25 70 91 9 74 1 7...
output:
8388559 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 62914557 0 62914557 62914557 0 62914557 0 0 0 62914557 0 62914557...
result:
ok 10000 numbers
Test #4:
score: -100
Wrong Answer
time: 187ms
memory: 28508kb
input:
500 382 156 418 376 91 15 142 274 449 174 375 82 118 175 421 458 361 222 14 474 11 324 368 341 227 424 231 249 81 435 250 271 118 38 147 61 124 408 135 1 244 316 301 80 39 313 90 118 290 465 465 250 277 341 8 105 319 373 305 379 309 200 180 398 47 489 463 259 173 492 494 343 251 193 111 32 401 270 4...
output:
219078761 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ...
result:
wrong answer 587th numbers differ - expected: '551612900', found: '633809726'