제출 #447257

#제출 시각아이디문제언어결과실행 시간메모리
447257alan8585Port Facility (JOI17_port_facility)C++14
22 / 100
6039 ms4692 KiB
#pragma GCC optimize ("Ofast","unroll-loops") #include <bits/stdc++.h> #define pb push_back #define eb emplace_back #define MP make_pair #define F first #define S second #define setpre(a) cout.precision(a),cout<<fixed; #define ALL(a) a.begin(),a.end() #define MEM(a,b) memset(a,b,sizeof a) #define Tie ios::sync_with_stdio(0),cin.tie(0); using namespace std; typedef long long ll; typedef long double ld; typedef pair<int,int> pii; typedef pair<ll,ll> pll; typedef pair<ld,ld> pdd; struct datas { int x, y, id; bool operator<(const datas &a) { return x < a.x; } }; int n; vector<datas> ori, v, tv; vector<int> C; int find(int a) { if(C[a] != a) return C[a] = find(C[a]); return a; } void merge(int a, int b) { // cout << a << ' ' << b << '\n'; a = find(a); b = find(b); if(a == b) return; C[a] = b; } // bool is_vali() { // sort(ALL(v)); // stack<int> st1, st2; // for(datas &i : v) { // while(!st1.empty() && st1.top() < i.x) // st1.pop(); // while(!st2.empty() && st2.top() < i.x) // st2.pop(); // if(st1.empty() || st1.top() > i.y) // st1.push(i.y); // else if(st2.empty() || st2.top() > i.y) // st2.push(i.y); // else // return 0; // } // return 1; // } int main() {Tie cin >> n; v.resize(n), C.resize(n * 2); for(int i = 0; i < n; i++) { cin >> v[i].x >> v[i].y; v[i].id = i; } for(int i = 0; i < n * 2; i++) C[i] = i; ori = v; // if(!is_vali()) { // cout << "0\n"; // return 0; // } v = ori; sort(ALL(v)); for(int i = 0; i < n; i++) { for(int j = 0; j < n; j++) { if(v[i].x < v[j].x && v[i].y < v[j].y && v[j].x < v[i].y) { merge(i, j + n); merge(i + n, j); } } } int ans = 1; for(int i = 0; i < n; i++) if(find(i) == find(i + n)) ans = 0; for(int i = 0; i < n; i++) if(find(i) == i) ans = (ans << 1) % 1000000007; cout << ans << '\n'; }
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