#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N=1000001;
vector<int> tree(4*(N+5),0);
void update(int idx,int l,int r,int ql,int qr,int x)
{
if(ql>qr) return;
if(l==ql&&r==qr) tree[idx]=x;
else
{
int m=(l+r)/2;
update(2*idx,l,m,ql,min(qr,m),x);
update(2*idx+1,m+1,r,max(ql,m+1),qr,x);
}
}
int query(int idx,int l,int r,int pos)
{
if(l==r) return tree[idx];
int m=(l+r)/2;
if(pos<=m) return max(tree[idx],query(2*idx,l,m,pos));
else return max(tree[idx],query(2*idx+1,m+1,r,pos));
}
int main()
{
ios::sync_with_stdio(0);
cin.tie(0);
int n;
cin >> n;
vector<array<int,2>> points(n+1,{0,0});
vector<array<int,3>> hot_pos(1,{0,0,0});
int hot_cnt=0;
auto add_hot=[&](int x,int y)->int
{
hot_cnt++;
hot_pos.push_back({x,y,hot_cnt});
return hot_cnt;
};
vector<array<int,4>> point_hots(n+1);
for(int i=1;i<=n;i++)
{
auto &[x,y]=points[i];
cin >> x >> y;
int t=0;
for(int j=0;j<=1;j++) for(int k=0;k<=1;k++) point_hots[i][t++]=add_hot(x+j,y+k);
}
int m;
cin >> m;
vector<array<int,2>> walls(m+1,{0,0});
vector<array<int,2>> wall_hots(m+1,{0,0});
for(int i=1;i<=m;i++)
{
auto &[a,b]=walls[i];
cin >> a >> b;
if(points[a]>points[b]) swap(a,b);
if(points[a][0]==points[b][0]) wall_hots[i]={point_hots[a][1],point_hots[a][3]};
else wall_hots[i]={point_hots[a][2],point_hots[a][3]};
}
vector<array<int,2>> vedges;
auto add_edge=[&](int a,int b)
{
vedges.push_back({a,b});
vedges.push_back({b,a});
};
auto process=[&]()
{
//extract edges
fill(tree.begin(),tree.end(),-1);
vector<array<int,2>> prv(N+1,{-1,-1}); //x,hot_id
vector<array<int,4>> events; //x,tp,[y,hot_id] or [yl,yr]
for(int i=1;i<=hot_cnt;i++) events.push_back({hot_pos[i][0],0,hot_pos[i][1],i});
for(int i=1;i<=m;i++)
{
auto [a,b]=walls[i];
auto [xa,ya]=points[a];
auto [xb,yb]=points[b];
if(xa==xb) events.push_back({xa,1,ya+1,yb});
}
sort(events.begin(),events.end());
for(auto [x,tp,yl,yr]:events)
{
if(tp==0)
{
int w=query(1,0,N,yl);
auto [px,pid]=prv[yl];
if(w<px) add_edge(yr,pid);
prv[yl]={x,yr};
}
else update(1,0,N,yl,yr,x);
}
//flip coordinates
for(int i=1;i<=n;i++) swap(points[i][0],points[i][1]);
for(int i=1;i<=hot_cnt;i++) swap(hot_pos[i][0],hot_pos[i][1]);
};
process();
process();
vector<int> cc_id(hot_cnt+1,0);
int cc_cnt=0;
queue<int> q;
sort(vedges.begin(),vedges.end());
vector<int> vedges_start(hot_cnt+1,0);
for(int i=(int)vedges.size()-1;i>=0;i--) vedges_start[vedges[i][0]]=i;
for(int i=1;i<=hot_cnt;i++)
{
if(cc_id[i]!=0) continue;
cc_cnt++;
auto add=[&](int a)
{
if(cc_id[a]==0)
{
cc_id[a]=cc_cnt;
q.push(a);
}
};
add(i);
while(!q.empty())
{
int a=q.front();
q.pop();
for(int j=vedges_start[a];j<(int)vedges.size()&&vedges[j][0]==a;j++) add(vedges[j][1]);
}
}
vedges.clear();
for(int i=1;i<=m;i++)
{
auto [a,b]=wall_hots[i];
vedges.push_back({cc_id[a],cc_id[b]});
vedges.push_back({cc_id[b],cc_id[a]});
}
sort(vedges.begin(),vedges.end());
for(int i=(int)vedges.size()-1;i>=0;i--) vedges_start[vedges[i][0]]=i;
vector<int> d(cc_cnt+1,0);
sort(hot_pos.begin(),hot_pos.end());
auto add=[&](int a,int nd)
{
if(d[a]==0)
{
d[a]=nd;
q.push(a);
}
};
for(auto [x,y,hot]:hot_pos)
{
add(cc_id[hot],1);
while(!q.empty())
{
int a=q.front();
q.pop();
for(int j=vedges_start[a];j<(int)vedges.size()&&vedges[j][0]==a;j++) add(vedges[j][1],d[a]+1);
}
}
vector<int> res;
for(int i=1;i<=m;i++)
{
auto [a,b]=wall_hots[i];
if(d[cc_id[a]]==d[cc_id[b]]) res.push_back(i);
}
cout << res.size() << "\n";
for(int w:res) cout << w << "\n";
return 0;
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
19 ms |
23816 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
19 ms |
23820 KB |
Output is correct |
| 2 |
Correct |
19 ms |
23764 KB |
Output is correct |
| 3 |
Correct |
21 ms |
23800 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
18 ms |
23784 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
20 ms |
23868 KB |
Output is correct |
| 2 |
Correct |
20 ms |
23924 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
19 ms |
23856 KB |
Output is correct |
| 2 |
Correct |
19 ms |
23808 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
20 ms |
23764 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
27 ms |
23892 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
23 ms |
23892 KB |
Output is correct |
| 2 |
Correct |
20 ms |
23972 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
22 ms |
23976 KB |
Output is correct |
| 2 |
Correct |
20 ms |
23892 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
111 ms |
32256 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Runtime error |
351 ms |
55952 KB |
Memory limit exceeded |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Runtime error |
383 ms |
56004 KB |
Memory limit exceeded |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Runtime error |
548 ms |
59668 KB |
Memory limit exceeded |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Runtime error |
564 ms |
60548 KB |
Memory limit exceeded |
| 2 |
Halted |
0 ms |
0 KB |
- |
