Submission #208358

#	Time	Username	Problem	Language	Result	Execution time	Memory
208358		bensonlzl	Semiexpress (JOI17_semiexpress)	C++14	100 / 100	28 ms	22648 KiB

semiexpress

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

ll N, M, K, A, B, C, T, X;
vector<ll> segs;

int dp[3005][3005];
int cnt[3005][3005];

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cin >> N >> M >> K;
	cin >> A >> B >> C;
	cin >> T;
	for (int i = 1; i <= M; ++i){
		cin >> X;
		segs.push_back(X);
	}
	K -= M;
	for (int i = 1; i < segs.size(); ++i){
		ll l = segs[i-1], r = segs[i];
		ll cost = B*(l-1), curleft = segs[i-1] + (T - cost)/A;
		if (T - cost < 0) curleft = l-1;
		cnt[i][0] = min(curleft,r-1); 
		for (int j = 1; j <= K; ++j){
			if (curleft >= r-1){
				cnt[i][j] = r-1;
				continue;
			}
			ll nextstop = curleft+1;
			if ((T - C * (nextstop - segs[i-1]) - (B*(segs[i-1]-1))) >= 0) curleft = nextstop + (T - C * (nextstop - segs[i-1]) - (B*(segs[i-1]-1)))/A;
			cnt[i][j] = min(curleft,r-1); 
		}
	}
	for (int j = 1; j < segs.size(); ++j){
		int l = 0;
		for (int i = 0; i <= K; ++i){
			while (l < i && dp[j-1][i-l] + (int)(cnt[j][l] < segs[j-1] ? 0 : cnt[j][l] - segs[j-1] + 1) < dp[j-1][i-l-1] + (int)(cnt[j][l+1] < segs[j-1] ? 0 : cnt[j][l+1] - segs[j-1] + 1)){
				l++;
			}
			dp[j][i] = dp[j-1][i-l]+(int)(cnt[j][l] < segs[j-1] ? 0 : cnt[j][l] - segs[j-1] + 1);
		}
	}
	/*
	for (int i = 1; i < segs.size(); ++i){
		for (int j = 0; j <= K; ++j){
			cout << cnt[i][j] << ' ';
		}
		cout << '\n';
	}
	cout << "\n\n";
	for (int i = 1; i < segs.size(); ++i){
		for (int j = 0; j <= K; ++j){
			cout << dp[i][j] << ' ';
		}
		cout << '\n';
	}
	*/
	cout << dp[segs.size()-1][K] + (T >= (N-1) * B) - 1 << '\n';
}

Compilation message (stderr)

semiexpress.cpp: In function 'int main()':
semiexpress.cpp:24:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 1; i < segs.size(); ++i){
                  ~~^~~~~~~~~~~~~
semiexpress.cpp:39:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int j = 1; j < segs.size(); ++j){
                  ~~^~~~~~~~~~~~~

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