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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#279062 | #7895. Graph Partitioning 2 | wenjing233 | WA | 11ms | 7408kb | C++14 | 2.3kb | 2023-12-08 09:30:26 | 2023-12-08 09:30:26 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
const int N=1e5+10,M=sqrt(N)+10;
const int P=998244353;
int T,n,k,sz[N],f[N][M],F[N],A[M];
vector<int>e[N];
void solve1(int u,int fa)
{
for(int i=0;i<=k+1;i++)
f[u][i]=0;
sz[u]=1;
f[u][1]=1;
for(auto v:e[u])
{
if(v==fa)continue;
solve1(v,u);
for(int i=0;i<=k+1;i++)
A[i]=0;
for(int i=1;i<=min(sz[u],k+1);i++)
for(int j=0;j<=min(sz[v],k);j++)
A[i+j]=(A[i+j]+1ll*f[u][i]*f[v][j])%P;
for(int i=1;i<=k+1;i++)
f[u][i]=A[i];
sz[u]+=sz[v];
}
f[u][0]=(f[u][k]+f[u][k+1])%P;
}
/*
合并进去时有一条边,切断/不切断
合法必切断,不合法必不切断
特殊情况:合法不切断:k的
*/
void solve2(int u,int fa)
{
sz[u]=1;
int siz=0;
for(auto v:e[u])
{
if(v==fa)continue;
solve2(v,u);
sz[u]+=sz[v];
siz+=sz[v]/k;
}
for(int i=0;i<=sz[u]/k;i++)
f[u][i]=0;
F[u]=0;
if(siz<=sz[u]/k-2)return;
int opt=0;
if(siz==sz[u]/k)opt=1;
sz[u]=1;
f[u][0]=1;
int tmp1=1,tmp2=0,tmp3=1;
for(auto v:e[u])
{
if(v==fa)continue;
for(int i=0;i<=sz[v]/k+sz[u]/k;i++)
A[i]=0;
for(int i=0;i<=sz[u]/k;i++)
{
for(int j=0;j<=sz[v]/k;j++)
A[i+j]=(A[i+j]+1ll*f[u][i]*f[v][j])%P;
if(opt)
{
tmp3=1ll*tmp3*f[v][sz[v]%k]%P;
tmp2=(1ll*tmp2*f[v][sz[v]%k]+1ll*tmp1*F[v])%P;
tmp1=1ll*tmp1*F[v]%P;
}
}
for(int j=0;j<=sz[v]/k+sz[u]/k;j++)
f[u][j]=A[j];
sz[u]+=sz[v];
}
if(opt)
{
F[u]=f[u][sz[u]%k];
if(sz[u]%k)
{
f[u][sz[u]%k]=((f[u][sz[u]%k]+f[u][sz[u]%k-1]-tmp3)%P+P)%P;
f[u][sz[u]%k-1]=tmp3;
}
f[u][sz[u]%k]=(f[u][sz[u]%k]+tmp2)%P;
return;
}
for(int j=0;j<=sz[u]/k;j++)
A[j]=f[u][j],f[u][j]=0;
for(int j=0;j<=sz[u]/k;j++)
{
int tmp=sz[u]-(siz*k+j);
if(tmp==k)f[u][j]=(f[u][j]+A[j])%P,F[u]=(F[u]+A[j])%P;
if(tmp==k+1)f[u][j+1]=(f[u][j+1]+A[j])%P;
}
}
int main()
{
ios::sync_with_stdio(false);
cin.tie(0),cout.tie(0);
cin >> T;
while(T--)
{
cin >> n >> k;
for(int i=1;i<=n;i++)
e[i].clear();
for(int i=1;i<n;i++)
{
int u,v;
cin >> u >> v;
e[u].push_back(v);
e[v].push_back(u);
}
if(1ll*k*k<=n)
{
solve1(1,0);
cout << f[1][0] << endl;
}
else
{
solve2(1,0);
if(sz[1]%k<=sz[1]/k)
cout << f[1][sz[1]%k] << endl;
else cout << "0\n";
}
}
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 2ms
memory: 5992kb
input:
2 8 2 1 2 3 1 4 6 3 5 2 4 8 5 5 7 4 3 1 2 1 3 2 4
output:
2 1
result:
ok 2 lines
Test #2:
score: -100
Wrong Answer
time: 11ms
memory: 7408kb
input:
5550 13 4 10 3 9 1 10 8 3 11 8 5 10 7 9 6 13 5 9 7 2 7 5 12 4 8 8 2 4 1 3 4 7 8 2 5 6 7 4 8 2 3 11 1 11 10 1 4 9 10 8 4 3 6 5 7 6 1 10 2 11 7 11 1 17 2 14 16 13 15 17 3 15 11 1 6 13 2 13 17 4 8 14 10 8 14 14 5 9 12 14 2 12 17 17 6 15 7 14 6 2 14 2 13 2 4 8 4 3 11 7 3 14 1 11 9 13 3 5 10 6 8 3 10 14 ...
output:
0 3 112 0 1 0 1 0 0 0 1 0 1 0 0 1 0 140 0 0 0 814 1 6 1 0 2 1 0 612 0 1 0 0 0 1 1 0 0 121 4536 0 0 1718 0 0 0 0 444 1 1908 1813 3 74 0 1 0 46 0 0 0 0 0 0 0 0 0 1 0 1 1 1 239 0 0 0 0 0 0 0 1 0 1 0 0 1 1 0 0 0 1 0 0 0 48 0 2 0 0 0 1 364 0 206 0 0 76 0 0 0 0 2 0 1 2 0 0 1 0 0 4 0 1 1 0 0 1 1 1 0 0 1 1 ...
result:
wrong answer 26th lines differ - expected: '1', found: '0'