Submission #447253

#TimeUsernameProblemLanguageResultExecution timeMemory
447253alan8585Port Facility (JOI17_port_facility)C++14
0 / 100
1 ms204 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; } }; 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 int n; cin >> n; v.resize(n), C.resize(n); for(int i = 0; i < n; i++) { C[i] = i; cin >> v[i].x >> v[i].y; v[i].id = 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 = i + 1; 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); } } } int ans = 1; for(int i = 0; i < n; i++) if(C[i] == i) ans = (ans << 1) % 1000000007; cout << ans << '\n'; }
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