이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
#define jizz ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
#define pb push_back
#define MP make_pair
#define F first
#define S second
#define MEM(i,j) memset(i,j,sizeof i)
#define ALL(v) v.begin(),v.end()
#define ET cout << "\n"
#define DB(a,s,e) {for(int i=s;i<e;++i) cout << a[i] << " ";ET;}
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
const ll MOD=1e9+7;
vector<int> G[1000005];
vector<pii> st;
list<int> ls[1000005];
pii seg[1000005];
int main()
{jizz
int n,flag=1,ans=1,tp=0;
cin >> n;
for(int i=0;i<n;++i)
cin >> seg[i].F >> seg[i].S;
sort(seg,seg+n);
for(int i=0;i<n&&flag;++i)
{
while(!st.empty()&&ls[st.back().F].front()<seg[i].F)
{
ls[st.back().F].erase(ls[st.back().F].begin());
if(ls[st.back().F].empty())
{
if(!st.back().S) ans=ans*2%MOD;
st.pop_back();
}
}
int beg=-1,tg=0;
while(!st.empty()&&ls[st.back().F].front()<seg[i].S)
{
if(tg)
{
flag=0;
break;
}
if(!~beg) beg=st.back().F;
else ls[beg].splice(ls[beg].end(),ls[st.back().F]);
if(st.back().S) tg=1;
st.pop_back();
}
if(~beg&&ls[beg].back()>seg[i].S)
flag=0;
if(!flag) break;
if(tg)
ls[st.back().F].insert(ls[st.back().F].begin(),seg[i].S);
else
st.pb(MP(++tp,0)),ls[tp].pb(seg[i].S);
if(~beg)
st.pb(MP(beg,1));
//cout << i << ":\n";
//for(int i=0;i<st.size();++i)
//{
// cout << "{";
// for(auto j:ls[st[i].F])
// cout << j << ",";
// cout << "} ";
//}
//ET;
}
for(;!st.empty();st.pop_back())
if(!st.back().S)
ans=ans*2%MOD;
if(flag) cout << ans << "\n";
else cout << "0\n";
}
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