Submission #931254

#	Time	Username	Problem	Language	Result	Execution time	Memory
931254		parlimoos	Port Facility (JOI17_port_facility)	C++14	0 / 100	2 ms	16732 KiB

port_facility

//Be Name KHODA
#pragma GCC optimize("Ofast")
#include<bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef long double ld;
#define pb push_back
#define pp pop_back
#define lb lower_bound
#define ub upper_bound
#define cl clear
#define bg begin
#define arr(x) array<int , x>
#define endl '\n'

const int MOD = int(1e9) + 7;

int n;
vector<arr(2)> a;
int h[1000000];
int segl[2][8000001] , segr[2][8000001] , seginf[8000001][2];
int ls[2000000] , rs[2000000] , is[2000000];
set<int> ord;

int Mul(int a , int b){
    return (1ll * a * b) % MOD;
}
int Pow(int a , int b){
    int res = 1;
    while(b){
        if((b & 1)) res = Mul(res , a);
        a = Mul(a , a) , b >>= 1;
    }
    return res;
}
void readSeg(int i){
    for(int md = 0 ; md < 2 ; md++){
        segl[md][i] = max(segl[md][i << 1] , segl[md][(i << 1) | 1]);
        segr[md][i] = min(segr[md][i << 1] , segr[md][(i << 1) | 1]);
    }
}
void buildSeg(int l = 0 , int r = n + n - 1 , int i = 1){
    seginf[i][0] = l , seginf[i][1] = r;
    if(l == r){
        is[l] = i;
        segl[0][i] = ls[l] , segl[1][i] = ls[l];
        segr[0][i] = rs[r] , segr[1][i] = rs[r];
    }else{
        int c = (l + r - 1) >> 1;
        buildSeg(l , c , (i << 1)) , buildSeg(c + 1 , r , (i << 1) | 1);
        readSeg(i);
    }
}
void updSeg(int md , int l , int r){
    int i = is[l];
    segl[md][i] = -1;
    while(i > 1) i >>= 1 , segl[md][i] = max(segl[md][i << 1] , segl[md][(i << 1) | 1]);
    i = is[r];
    segr[md][i] = int(1e9);
    while(i > 1) i >>= 1 , segr[md][i] = max(segr[md][i << 1] , segr[md][(i << 1) | 1]);
}
int getMn(int l , int r , int md , int i){
    if(seginf[i][0] >= l and seginf[i][1] <= r) return segr[md][i];
    if(seginf[i][1] >= l and seginf[i][0] <= r) return min(getMn(l , r , md , i << 1) , getMn(l , r , md , (i << 1) | 1));
    return int(1e9);
}
int getMx(int l , int r , int md , int i){
    if(seginf[i][0] >= l and seginf[i][1] <= r) return segl[md][i];
    if(seginf[i][1] >= l and seginf[i][0] <= r) return max(getMx(l , r , md , i << 1) , getMx(l , r , md , (i << 1) | 1));
    return -1;
}

int main(){
    ios::sync_with_stdio(0);
    cin.tie(0);

    cin >> n;
    fill(&ls[0] , &ls[n + n] , -1) , fill(&rs[0] , &rs[n + n] , int(1e9)) , fill(&h[0] , &h[n + n] , -1);
    for(int i = 0 ; i < n ; i++){
        int l , r;
        cin >> l >> r;
        ls[l - 1] = r - 1 , rs[r - 1] = l - 1;
        ord.insert(l - 1);
    }
    buildSeg();
    int o = 0;
    while(!ord.empty()){
        queue<int> q;
        q.push(*ord.bg()) , ord.erase(ord.bg());
        h[q.front()] = 0 , o++;
        updSeg(1 , q.front() , ls[q.front()]);

        while(!q.empty()){
            int l = q.front() , r = ls[l];
            q.pop();

            while(true){
                int d = getMx(l , r , h[l] , 1);
                if(d <= r) break;
                if(h[rs[d]] == h[l]){
                    // cout << l << " " << rs[d] << " : " << h[l] << " " << h[rs[d]] << "|\n";
                    cout << 0;
                    exit(0);
                }
                h[rs[d]] = (h[l] ^ 1);
                updSeg(h[l] , rs[d] , d);
                q.push(rs[d]) , ord.erase(rs[d]);
            }
            while(true){
                int d = getMn(l , r , h[l] , 1);
                if(d >= l) break;
                if(h[d] == h[l]){
                    cout << 0;
                    exit(0);
                }
                h[d] = (h[l] ^ 1);
                updSeg(h[l] , d , ls[d]);
                q.push(d) , ord.erase(d);
            }
        }
    }
    cout << Pow(2 , o);
}

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