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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#757132 | #9570. Binary Tree | hlzy_awei | WA | 2ms | 11848kb | C++14 | 3.2kb | 2024-11-17 00:34:25 | 2024-11-17 00:34:27 |
Judging History
answer
#include <iostream>
#include <algorithm>
#include <string>
#include <cstring>
#include <vector>
#include <map>
#include <stack>
#include <unordered_map>
#include <cmath>
#include <queue>
#include <deque>
#include <set>
typedef long long int ll;
using namespace std;
typedef pair<ll, ll> pll;
typedef pair<int, int>pii;
const ll N = 1e6+10, INF = 1e9,mod=998244353;
int h[N],ne[N],e[N],it,deth[N],dp[N][20];
int t;
int n,m,s;
void add(int a,int b)
{
e[++it]=b;
ne[it]=h[a];
h[a]=it;
}
void dfs(int x,int fa)
{
deth[x]=deth[fa]+1;
dp[x][0]=fa;
for(int i=1;i<20;i++)
{
dp[x][i]=dp[dp[x][i-1]][i-1];
}
for(int i=h[x];i;i=ne[i])
{
if(e[i]!=fa)dfs(e[i],x);
}
}
int lca(int x,int y)
{
if(deth[y]>deth[x])swap(y,x);
for(int i=19;i>=0;i--)
{
if(deth[dp[x][i]]>=deth[y])x=dp[x][i];
}
if(x==y)return x;
for(int i=19;i>=0;i--)
{
if(dp[x][i]!=dp[y][i])y=dp[y][i],x=dp[x][i];
}
return dp[x][0];
}
int mx;
int cc;
int hh[200005];
void dfs1(int x,int fa,int step)
{
if(hh[x]!=cc)
return;
// cout<<x<<" ";
if(step>mx)
{
mx=step;
s=x;
}
for(int i=h[x];i;i=ne[i])
{
if(e[i]!=fa)
dfs1(e[i],x,step+1);
}
}
int ch;
set<pair<ll,ll>> ans;
int main()
{
cin>>t;
while(t--)
{
mx=0;
it=0;
cin>>n;
for(int i=1;i<=n;i++)
h[i]=0,hh[i]=0,deth[i]=0;
for(int i=1;i<=n;i++)
{
int u,v;
cin>>u>>v;
if(u)
{
add(u,i);
add(i,u);
}
if(v)
{
add(i,v);
add(v,i);
}
}
cc=0;
dfs1(1,0,1);
dfs(s,0);
mx=0;
int l=s,r;
dfs1(s,0,1);
r=s;
while(l!=r)
{
cout<<"? "<<l<<" "<<r<<endl;
cin>>ch;
ans.clear();
for(int i=1;i<=n;i++)
{
int fl=lca(i,l),fr=lca(i,r);
int lenl=deth[i]+deth[l]-2*deth[fl];
int lenr=deth[i]+deth[r]-2*deth[fr];
// cout<<lenl<<" "<<lenr<<"\n";
if(ch==0)
{
if(lenl<lenr&&hh[i]==cc)
{
ans.insert({lenl,i});
}
}
else if(ch==2)
{
if(lenl>lenr&&hh[i]==cc)
{
ans.insert({lenr,i});
}
}
else
{
if(lenl==lenr&&hh[i]==cc)
ans.insert({lenl-lenr,i});
}
}
// cout<<ans.size();
for(auto i:ans)
hh[i.second]++;
auto it=ans.begin();
cc++;
mx=0;
// cout<<"\n";
dfs1(it->second,0,1);
// cout<<"\n";
l=s;
mx=0;
dfs1(l,0,1);
// cout<<"\n";
r=s;
cout<<l<<" "<<r<<"\n";
}
cout<<"! "<<l<<endl;
}
return 0;
}
Details
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Test #1:
score: 0
Wrong Answer
time: 2ms
memory: 11848kb
input:
2 5 0 0 1 5 2 4 0 0 0 0 2
output:
? 4 5 1 5 ? 1 5
result:
wrong answer Token parameter [name=op] equals to "1", doesn't correspond to pattern "[?!]{1,1}" (test case 1)