Submission #140840

#	Time	Username	Problem	Language	Result	Execution time	Memory
140840		DrumpfTheGodEmperor	Semiexpress (JOI17_semiexpress)	C++14	100 / 100	993 ms	141904 KiB

semiexpress

#include <bits/stdc++.h>
#define int long long
#define bp __builtin_popcountll
#define pb push_back
#define in(s) freopen(s, "r", stdin);
#define out(s) freopen(s, "w", stdout);
#define inout(s, end1, end2) freopen((string(s) + "." + end1).c_str(), "r", stdin),\
		freopen((string(s) + "." + end2).c_str(), "w", stdout);
#define fi first
#define se second
#define bw(i, r, l) for (int i = r - 1; i >= l; i--)
#define fw(i, l, r) for (int i = l; i < r; i++)
#define fa(i, x) for (auto i: x)
using namespace std;
const int mod = 1e9 + 7, inf = 1061109567;
const long long infll = 4557430888798830399;
const int N = 3005;
int n, m, k, a, b, c, t, s[N], mxStations[N][N], dp[N][N];
signed main() {
	#ifdef BLU
	in("blu.inp");
	#endif
	ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
	cin >> n >> m >> k >> a >> b >> c >> t;
	k -= m;
	memset(mxStations, 0, sizeof mxStations);
	fw (i, 0, m) cin >> s[i];
	fw (i, 0, m) {
		int leftBound = s[i], rightBound = n;
		if (i < m - 1) rightBound = s[i + 1] - 1;
		//mxStations[i][j]: Maximum stations between the bounds if j stations are used.
		//Greedily place a station at minimum station that can't be reached.
		int remainingTime = t - b * (s[i] - 1);
		if (remainingTime < 0) break;
		int curPos = 1;
		fw (j, 0, k + 1) {
			int remaining = remainingTime - (curPos - 1) * c;
			if (remaining < 0) break;
			curPos = min(curPos + remaining / a, rightBound - leftBound + 1);
			mxStations[i][j] = curPos;
			curPos++;
//			cout << "Place station " << j + 1 << " at pos " << leftBound + curPos - 1 << "\n";
//			cout << "mxStations[" << i << "][" << j << "] = " << mxStations[i][j] << "\n";
		}
		if (i == 0) {
			fw (j, 0, k + 1) mxStations[i][j]--; //Not including 1.
		}
	}
	memset(dp, 0, sizeof dp);
	fw (i, 0, m) fw (j, 0, k + 1) {
		fw (l, 0, j + 1) {
			int lst = i ? dp[i - 1][j - l] : 0;
			dp[i][j] = max(dp[i][j], lst + mxStations[i][l]);
		}
	}
	cout << dp[m - 1][k];
	return 0;
}

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