Submission #1042782

#	Time	Username	Problem	Language	Result	Execution time	Memory
1042782		Zicrus	Roller Coaster Railroad (IOI16_railroad)	C++17	0 / 100	33 ms	10332 KiB

railroad

#include <bits/stdc++.h>
#include "railroad.h"
using namespace std;

typedef long long ll;

ll plan_roller_coaster(vector<int> s, vector<int> t) {
    ll n = s.size();

    vector<pair<ll, ll>> a(n);
    for (int i = 0; i < n; i++) {
        a[i] = {s[i], t[i]};
    }
    mt19937 mt(time(0));
    shuffle(a.begin(), a.end(), mt);
    ll res = 0;
    for (int i = 1; i < n; i++) {
        res += max(0ll, a[i-1].second - a[i].first);
    }

    bool done;
    do {
        done = true;
        for (int i = 1; i < n; i++) {
            ll prev = max(0ll, a[i-1].second - a[i].first);
            ll nw = max(0ll, a[i].second - a[i-1].first);
            if (i > 1) {
                prev += max(0ll, a[i-2].second - a[i-1].first);
                nw += max(0ll, a[i-2].second - a[i].first);
            }
            if (i < n-1) {
                prev += max(0ll, a[i].second - a[i+1].first);
                nw += max(0ll, a[i-1].second - a[i+1].first);
            }
            if (nw < prev) {
                swap(a[i-1], a[i]);
                done = false;
                res += nw - prev;
            }
        }
    } while (!done);

    return res;
}

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