Submission #1178603

#TimeUsernameProblemLanguageResultExecution timeMemory
1178603ASN49KPort Facility (JOI17_port_facility)C++20
100 / 100
2690 ms295472 KiB
#include <bits/stdc++.h> #define int long long #define all(x) x.begin(),x.end() #define LOCAL 0 std::mt19937_64 rng(6994031); #define UNUSED -1 const int N_MAX=1'000'000; const int mod=1e9+7; using i64=long long; int viz[N_MAX]; std::vector<int>adj[N_MAX]; struct Aib { int n; std::vector<int>maxx; int lsb(int x) { return x&(-x); } void update(int poz,int val) { for(int i=poz;i<=n;i+=lsb(i)) { maxx[i]=std::max(maxx[i] , val); } } int query(int poz) { int rez=0; for(int i=poz;i>0;i-=lsb(i)) { rez=std::max(rez , maxx[i]); } return rez; } void init(int n) { this->n=n; maxx=std::vector<int>(n+1,0); } }; struct interval { int l,r,rezl,rezr,index; }; void dfs(int nod,int val) { if(viz[nod]!=-1) { return; } viz[nod]=val; for(auto &c:adj[nod]) { dfs(c,val^1); } } signed main() { #if LOCAL auto __file = freopen("input.txt","r",stdin); #endif std::ios::sync_with_stdio(false); std::cin.tie(0); int n; std::cin>>n; for(int i=0;i<n;i++) { adj[i].clear(); viz[i]=-1; } std::vector<interval>a(n); std::vector<i64>cash(2*n+1); int idk=0; for(auto &c:a) { std::cin>>c.l>>c.r; cash[c.l]=cash[c.r]=rng(); c.index=idk++; } int rez=1; std::set<int>mp; mp.insert(0); for(int i=1;i<=2*n;i++) { cash[i]^=cash[i-1]; if(mp.count(cash[i])) { rez*=2; rez%=mod; } mp.insert(cash[i]); } std::sort(all(a) , [&](interval x,interval y){ return x.l<y.l; }); Aib aib; aib.init(2*n); for(auto &c:a) { c.rezl=aib.query(c.r); aib.update(c.r,c.r); } std::set<std::pair<int,int>>mpp; for(auto &c:a) { auto it=mpp.lower_bound({c.l,-1}); std::vector<std::pair<int,int>>aux; while(it!=mpp.end() && it->first<=c.r) { aux.push_back(*it); //std::cout<<std::min(c.index,it->second)<<' '<<std::max(c.index,it->second)<<'\n'; adj[c.index].push_back(it->second); adj[it->second].push_back(c.index); it++; } for(auto &v:aux) { mpp.erase(v); } mpp.insert({c.r , c.index}); } mpp.clear(); std::sort(all(a) , [&](interval x,interval y){ return x.r>y.r; }); aib.init(2*n); for(auto &c:a) { c.rezr=2*n-aib.query(2*n-c.l+1)+1; aib.update(2*n-c.l+1 , 2*n-c.l+1); } for(auto &c:a) { auto it=mpp.lower_bound({-c.r,-1}); std::vector<std::pair<int,int>>aux; while(it!=mpp.end() && -it->first>=c.l) { aux.push_back(*it); adj[c.index].push_back(it->second); adj[it->second].push_back(c.index); it++; } for(auto &v:aux) { mpp.erase(v); } mpp.insert({-c.l , c.index}); } mpp.clear(); for(auto &c:a) { rez*=(c.rezl<=c.rezr); } for(int i=0;i<n;i++) { if(viz[i]==-1) { dfs(i,0); } } for(int i=0;i<n;i++) { for(auto &c:adj[i]) { if(viz[i]==viz[c]) { rez=0; } } } std::cout<<rez; }
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