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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#691869 | #8551. DFS Order 5 | szy10010 | WA | 31ms | 30072kb | C++23 | 3.7kb | 2024-10-31 13:17:40 | 2024-10-31 13:17:41 |
Judging History
answer
#include <map>
#include <set>
#include <queue>
#include <deque>
#include <cmath>
#include <vector>
#include <cstring>
#include <iostream>
#include <algorithm>
#include <unordered_map>
using namespace std;
#define fi first
#define se second
#define u1 (u<<1)
#define u2 (u<<1|1)
#define pb push_back
#define pp pop_back()
#define int long long
#define laile cout<<"laile"<<endl
#define lowbit(x) ((x)&(-x))
#define double long double
#define sf(x) scanf("%lld",&x)
#define sff(x,y) scanf("%lld %lld",&x,&y)
#define sd(x) scanf("%Lf",&x)
#define sdd(x,y) scanf("%Lf %Lf",&x,&y)
#define _for(i,n) for(int i=0;i<(n);++i)
#define _rep(i,a,b) for(int i=(a);i<=(b);++i)
#define _pre(i,a,b) for(int i=(a);i>=(b);--i)
#define all(x) (x).begin(), (x).end()
#define IOS ios::sync_with_stdio(false);cin.tie(0);cout.tie(0)
typedef unsigned long long ULL;
typedef pair<int,int>PII;
const int N=1e6+10,INF=4e18;
int n,m;
int h[N],e[N],ne[N],idx;
int depth[N],fa[N][20],sz[N],cnt[N],son[N];
void add(int a,int b)
{
e[idx]=b;
ne[idx]=h[a];
h[a]=idx++;
}
void bfs(int root)
{
memset(depth,0x3f,sizeof(depth));
depth[0]=0;
depth[root]=1;
queue<int>q;
q.push(root);
while(q.size())
{
auto t=q.front();
q.pop();
for(int i=h[t];~i;i=ne[i])
{
int j=e[i];
if(depth[j]>depth[t]+1)
{
depth[j]=depth[t]+1;
q.push(j);
fa[j][0]=t;
for(int i=1;i<=19;i++)
fa[j][i]=fa[fa[j][i-1]][i-1];
}
}
}
return;
}
//int la(int a,int dep)
//{
// for(int i=19;i>=0;i--)
// if(fa[a][i]<=dep)
// a=fa[a][i];
// return a;
//}
int la(int v, int d) {
for (int k = 20; k >= 0; --k) {
if (d >= (1 << k)) {
v = fa[v][k];
d -= (1 << k);
}
}
return v;
}
int lca(int a,int b)
{
if(depth[a]<depth[b])swap(a,b);
for(int i=19;i>=0;i--)
if(depth[fa[a][i]]>=depth[b])a=fa[a][i];
if(a==b)return a;
for(int i=19;i>=0;i--)
if(fa[a][i]!=fa[b][i])
a=fa[a][i],b=fa[b][i];
return fa[a][0];
}
void dfs(int u,int fa)
{
sz[u]=1;
for(int i=h[u];~i;i=ne[i])
{
int j=e[i];
if(j==fa)continue;
dfs(j,u);
sz[u]+=sz[j];
}
return ;
}
void solve()
{
memset(h,-1,sizeof(h));
cin>>n>>m;
_rep(i,2,n)
{
int a,b;
cin>>a>>b;
add(a,b);
add(b,a);
}
bfs(1);
dfs(1,0);
while(m--)
{
cin>>n;
bool bl=true;
int pre=0;
vector<int>v;
_rep(i,1,n)
cin>>son[i],cnt[son[i]]=1;
_rep(i,1,n)
{
if(pre)
{
if(pre==fa[son[i]][0])
{
v.pb(son[i]);
pre=son[i];
continue;
}
else
{
bool pan=true;
int lc=lca(pre,son[i]);
int lc_1=la(pre,depth[son[i]]+1);
int prenow=0,now=0;
while(v.size())
{
if(depth[v.back()]<=depth[son[i]])break;
// cout<<"prev.back()"<<cnt[v.back()]<<" "<<now<<endl;
if(fa[prenow][0]!=v.back())now+=max(cnt[prenow],1ll);//同级,取max防止prenow=0
else cnt[v.back()]+=now,now=cnt[v.back()];
// cout<<"nowv.back()"<<cnt[v.back()]<<" "<<now<<endl;
// if(!now)cnt[fa[v.back()][0]]++;
// cout<<"在判断"<<son[i]<<"时"<<"弹出"<<v.back()<<endl;
if(cnt[v.back()]!=sz[v.back()])
{
// cout<<v.back()<<" "<<cnt[v.back()]<<" "<<sz[v.back()]<<" "<<now<<'\n';
pan=false;
break;
}
prenow=v.back();
v.pp;
}
if(!pan||!fa[son[i]]||fa[son[i]][0]!=lc||cnt[prenow]!=sz[prenow])
{
// cout<<son[i]<<" "<<cnt[lc_1]<<" "<<sz[lc_1]<<endl;
bl=false;
break;
}
v.pb(son[i]);
}
}
pre=son[i];
}
_rep(i,1,n)cnt[son[i]]=0;
if(bl)cout<<"Yes\n";
else cout<<"No\n";
}
return ;
}
signed main()
{
IOS;
int T=1;
// cin>>T;
while(T--)
solve();
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 6ms
memory: 30072kb
input:
6 7 1 2 1 3 2 4 3 5 2 6 2 4 1 2 4 2 2 4 3 2 4 4 2 4 5 2 4 6 6 1 2 6 4 3 5
output:
No No Yes No No Yes Yes
result:
ok 7 tokens
Test #2:
score: -100
Wrong Answer
time: 31ms
memory: 29944kb
input:
10 100000 7 2 1 7 7 10 8 6 8 7 1 3 4 5 9 5 5 8 8 8 9 7 2 8 1 6 1 4 8 3 5 2 6 7 10 3 9 9 1 1 1 8 10 3 2 9 3 8 7 3 7 5 6 2 8 5 9 1 6 3 4 6 2 1 3 5 8 9 2 4 9 1 3 2 1 5 5 8 5 1 7 9 10 5 2 9 2 6 4 10 6 3 8 3 4 5 8 2 8 4 9 4 10 1 2 4 3 3 6 3 1 3 6 1 1 6 8 3 1 3 7 3 2 3 9 1 5 4 3 7 8 10 9 4 2 3 10 2 5 4 3 ...
output:
No No No Yes No No No No Yes No No No No No No Yes No No No Yes No No No No No No No No No Yes No Yes No No No No No No Yes No No No No No Yes Yes No No No No No No No No No No No No No No No No No No No No No No No No Yes No No Yes Yes No No No No Yes No No No No No No No No Yes No No No No No No N...
result:
wrong answer 20th words differ - expected: 'No', found: 'Yes'