제출 #986999

#제출 시각아이디문제언어결과실행 시간메모리
986999GrindMachinePort Facility (JOI17_port_facility)C++17
10 / 100
5487 ms36916 KiB
#include <bits/stdc++.h> #include <ext/pb_ds/assoc_container.hpp> #include <ext/pb_ds/tree_policy.hpp> using namespace std; using namespace __gnu_pbds; template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>; typedef long long int ll; typedef long double ld; typedef pair<int,int> pii; typedef pair<ll,ll> pll; #define fastio ios_base::sync_with_stdio(false); cin.tie(NULL) #define pb push_back #define endl '\n' #define sz(a) (int)a.size() #define setbits(x) __builtin_popcountll(x) #define ff first #define ss second #define conts continue #define ceil2(x,y) ((x+y-1)/(y)) #define all(a) a.begin(), a.end() #define rall(a) a.rbegin(), a.rend() #define yes cout << "Yes" << endl #define no cout << "No" << endl #define rep(i,n) for(int i = 0; i < n; ++i) #define rep1(i,n) for(int i = 1; i <= n; ++i) #define rev(i,s,e) for(int i = s; i >= e; --i) #define trav(i,a) for(auto &i : a) template<typename T> void amin(T &a, T b) { a = min(a,b); } template<typename T> void amax(T &a, T b) { a = max(a,b); } #ifdef LOCAL #include "debug.h" #else #define debug(...) 42 #endif /* */ const int MOD = 1e9 + 7; const int N = 2e3 + 5; const int inf1 = int(1e9) + 5; const ll inf2 = ll(1e18) + 5; vector<ll> adj[N]; vector<ll> col(N,-1); bool bip = true; void dfs1(ll u){ ll want = col[u]^1; trav(v,adj[u]){ if(col[v] != -1){ if(col[v] != want){ bip = false; } } else{ col[v] = want; dfs1(v); } } } void solve(int test_case) { ll n; cin >> n; vector<pll> a(n+5); rep1(i,n) cin >> a[i].ff >> a[i].ss; rep1(i,n){ for(int j = i+1; j <= n; ++j){ auto [l1,r1] = a[i]; auto [l2,r2] = a[j]; if(l1 > l2) swap(l1,l2), swap(r1,r2); if(l1 < l2 and l2 < r1 and r1 < r2){ adj[i].pb(j), adj[j].pb(i); } } } bool edge[n+5][n+5]; memset(edge,0,sizeof edge); rep1(u,n){ trav(v,adj[u]){ edge[u][v] = 1; } } ll ans = 1; rep1(i,n){ if(col[i] != -1) conts; col[i] = 0; dfs1(i); ans = ans*2%MOD; } bip = true; rep1(u,n){ trav(v,adj[u]){ trav(w,adj[u]){ if(edge[v][w]){ bip = false; } } } } if(!bip) ans = 0; cout << ans << endl; } int main() { fastio; int t = 1; // cin >> t; rep1(i, t) { solve(i); } return 0; }
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