Submission #986980

#	Time	Username	Problem	Language	Result	Execution time	Memory
986980		GrindMachine	Port Facility (JOI17_port_facility)	C++17	22 / 100	34 ms	32984 KiB

port_facility

#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);
            }
        }
    }

    ll ans = 1;

    rep1(i,n){
        if(col[i] != -1) conts;
        col[i] = 0;
        dfs1(i);
        ans = ans*2%MOD;
    }

    if(!bip) ans = 0;

    cout << ans << endl;
}

int main()
{
    fastio;

    int t = 1;
    // cin >> t;

    rep1(i, t) {
        solve(i);
    }

    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 12 / 12
• Subtask 3: 0 / 56
• Subtask 4: 0 / 22