Submission #1052055

#	Time	Username	Problem	Language	Result	Execution time	Memory
1052055		alex_2008	Semiexpress (JOI17_semiexpress)	C++14	100 / 100	1 ms	600 KiB

semiexpress

#include <iostream>
#include <vector>
#include <algorithm>
#include <stack>
#include <set>
#include <queue>
using namespace std;
typedef long long ll;
const int N = 3e3 + 10;
ll s[N];
ll n, m, k;
ll a, b, c;
ll t;
ll prev(ll x) {
	int i = upper_bound(s + 1, s + m + 1, x) - s;
	return s[i - 1];
}
ll nx(ll x) {
	int i = lower_bound(s + 1, s + m + 1, x) - s;
	return s[i];
}
int main() {
	cin >> n >> m >> k >> a >> b >> c >> t;
	for (int i = 1; i <= m; i++) {
		cin >> s[i];
	}
	ll ans = 0;
	if ((n - 1) * b <= t) ans++;
	priority_queue <pair<ll, ll>> Q;
	for (int i = 1; i < m; i++) {
		if ((s[i] - 1) * b > t) continue;
		if ((s[i] - 1) * b + (s[i + 1] - s[i] - 1) * a <= t) {
			ans += (s[i + 1] - s[i]);
			continue;
		}
		ll mnac = t - (s[i] - 1) * b;
		ans += (mnac / a) + 1;
		ll pos = s[i] + (mnac / a) + 1;
		mnac -= (pos - s[i]) * c;
		if (mnac >= 0) {
			ll u = min(s[i + 1] - pos, (mnac / a) + 1);
			Q.push({ u,  pos });
		}
	}
	int i = k - m;
	while (i-- && !Q.empty()) {
		pair <ll, ll> v = Q.top(); Q.pop();
		//cout << "? " << v.first << " " << v.second << "\n";
		ans += v.first;
		if (v.second == -1) continue;
		ll prv = prev(v.second);
		ll nxt = nx(v.second);
		ll u = (v.second - prv) * c + (prv - 1) * b;
		ll mnac = t - u;
		ll pos = min(nxt, v.second + (mnac / a) + 1);
		mnac -= (pos - v.second) * c;
		if (mnac >= 0) {
			ll z = min(nxt - pos, (mnac / a) + 1);
			if (pos >= nxt) pos = -1;
			Q.push({ z,  pos });
		}
	}
	cout << ans - 1 << "\n";
}
/*

*/

• Subtask 1: 18 / 18
• Subtask 2: 30 / 30
• Subtask 3: 52 / 52