Submission #709191

#	Time	Username	Problem	Language	Result	Execution time	Memory
709191		myrcella	Semiexpress (JOI17_semiexpress)	C++17	100 / 100	9 ms	340 KiB

semiexpress

//by szh
#include<bits/stdc++.h>
using namespace std;

#define fi first
#define se second
#define pii pair<int,int>
#define pll pair<long long,long long>
#define pb push_back
#define debug(x) cerr<<#x<<"="<<x<<endl
#define pq priority_queue
#define inf 0x3f
#define rep(i,a,b) for (int i=a;i<(b);i++)
#define MP make_pair
#define SZ(x) (int(x.size()))
#define ll long long
#define mod 1000000007
#define ALL(x) x.begin(),x.end()
void inc(int &a,int b) {a=(a+b)%mod;}
void dec(int &a,int b) {a=(a-b+mod)%mod;}
int lowbit(int x) {return x&(-x);}
ll p0w(ll base,ll p) {ll ret=1;while(p>0){if (p%2ll==1ll) ret=ret*base%mod;base=base*base%mod;p/=2ll;}return ret;}

const int maxn = 3010;

int n,m,K;
ll A,B,C,T;
ll stop[maxn];
int nxt[maxn],tmpnxt[maxn];

int main() {
//	freopen("input.txt","r",stdin);	
	std::ios::sync_with_stdio(false);cin.tie(0);
	cin>>n>>m>>K>>A>>B>>C>>T;
	rep(i,0,m) cin>>stop[i];
	int ans = 0;
	ll sum;
	rep(i,0,m-1) {
		sum=B*(stop[i]-1);
		if (sum<=T and i!=0) ans++;
		if (sum>=T) {
			nxt[i] = -1;
			continue;
		}
		ll tmp = min(stop[i+1]-stop[i]-1,(T-sum)/A);
		ans+=tmp;
		nxt[i] = stop[i]+tmp+1;
	}
	if (B*(n-1)<=T) ans++;
//	debug(ans);
	rep(_,0,K-m) {
		ll val=0;
		int pos=-1;
		rep(i,0,m-1) {
			if (nxt[i]==-1 or nxt[i]==stop[i+1]) continue;
			ll tt = B*(stop[i]-1)+C*(nxt[i]-stop[i]);
			if (tt>T) continue;
			ll tmp = min((T-tt)/A,stop[i+1]-nxt[i]-1);
			tmpnxt[i] = nxt[i] + tmp+1;
			if (tmp+1>val) {
				val = tmp+1;
				pos = i;
			}
		}
		if (val==0) break;
		ans += val;
//		debug(val);
		nxt[pos] = tmpnxt[pos];
	}
	cout<<ans;
	return 0;
}

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