Submission #1020745

#	Time	Username	Problem	Language	Result	Execution time	Memory
1020745		vjudge1	Roller Coaster Railroad (IOI16_railroad)	C++17	0 / 100	450 ms	26196 KiB

railroad

#include "railroad.h"
#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back
#define pii pair<int, int>
#define ff first
#define ss second
#define popcnt __builtin_popcount
#define mp make_pair

pii a[200100];

long long plan_roller_coaster(vector<int> s, vector<int> t) {
    int n = s.size();
    multiset<pii> l, r;
    for(int i=0; i<n; i++){
        l.insert({s[i], t[i]});
        r.insert({t[i], s[i]});
    }
    l.insert({0, 0});
    r.insert({0, 0});
    l.insert(mp(1e18, 1e18));
    r.insert(mp(1e18, 1e18));
    while(l.size() > 1){
        pii x = *l.rbegin();
        auto it = r.lower_bound(mp(x.ff,2e18));
        if(it == r.begin()) return 1;
        it--;
        pii y = *it;
        y = mp(y.ss, y.ff);
        if(y == x){
            if(it == r.begin()) return 1;
            it--;
            y = *it;
            y = mp(y.ss, y.ff);

        }
        r.erase(r.find(mp(y.ss, y.ff)));
        r.erase(r.find(mp(x.ss, x.ff)));
        l.erase(l.find(x));
        l.erase(l.find(y));
        l.insert({y.ff, x.ss});
        r.insert({x.ss, y.ff});
    }
    return 0;
}

• Subtask 1: 0 / 11
• Subtask 2: 0 / 23
• Subtask 3: 0 / 30
• Subtask 4: 0 / 36