Submission #158506

#	Time	Username	Problem	Language	Result	Execution time	Memory
158506		gs18103	Safety (NOI18_safety)	C++14	3 / 100	65 ms	4184 KiB

safety

#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

ll s[202020];
multiset <ll> R;
multiset <ll, greater <ll> > L;

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

	int n; ll h;
	cin >> n >> h;
	for(int i = 1; i <= n; i++) {
		cin >> s[i];
	}

	ll l = s[1], r = s[1], ans = 0;
	L.insert(s[1]), R.insert(s[1]);
	for(int i = 2; i <= n; i++) {
		l -= h, r += h;
		if(s[i] < l) {
			ans += l - s[i];
			R.insert((*R.begin())-r+l);
			L.insert(s[i] + h * (i - 1));
			L.insert(s[i] + h * (i - 1));
			ll d = *L.begin() - *(next(L.begin()));
			r = l; l = l - d;
			L.erase(*L.begin());
		}
		else if(s[i] > r) {
			ans += s[i] - r;
			L.insert((*L.begin())+r-l);
			R.insert(s[i] - h * (i - 1));
			R.insert(s[i] - h * (i - 1));
			ll d = *(next(R.begin())) - *(R.begin());
			l = r; r = l + d; 
			R.erase(*R.begin());
		}
		else {
			l = r = s[i];
			L.insert(s[i] + h * (i - 1));
			R.insert(s[i] - h * (i - 1));
		}
	}
	cout << ans;
}

• Subtask 1: 3 / 3
• Subtask 2: 0 / 4
• Subtask 3: 0 / 9
• Subtask 4: 0 / 5
• Subtask 5: 0 / 6
• Subtask 6: 0 / 11
• Subtask 7: 0 / 11
• Subtask 8: 0 / 22
• Subtask 9: 0 / 29