RQNOJ 658(观光公交)

几大注意点:

1.一次使用氦气加速器会把后面分成好几段。

2.我们仅维护end[i],wait[i]恒定,因此需提前让wait[i]=max(wait[i-1],wait[i]);

3.w[i]+w[i+1]+...+w[j],且w恒定,故可预处理sum[i](满足累加性)


#include<cstdio>
#include<cstdlib>
#include<cmath>
#include<string>
#include<algorithm>
#include<queue>
#include<functional>
#include<iostream>
#define MAXN 1000 +10
#define MAXM 10000 + 10
#define MAXK 100000 + 10
#define MAXD 100 + 10
#define MAXT 100000 + 10
using namespace std;
struct man
{
	int t,l,r;
}t[MAXM];
struct interval
{
	int l,r,w;
};

int n,m,k,ans,d[MAXN+1],wait[MAXN+1],w[MAXN+1],end[MAXN+1],sum[MAXN+1];
bool operator<(const interval a,const interval b)   //重载  operator < 的意思   为q做准备   
{
	
	
	return a.w<b.w;	
}

priority_queue<interval> q;   //priority_queue<Node, vector<Node>, greater<Node> >; 完整的不能用 


void push(int l,int r)
{
	bool flag=0;
	for (int i=l;i<r;i++) if (d[i]) {flag=1;break;}
	if (!flag) return;
	int tot=sum[r]-sum[l];
	if (!tot) return ;
	interval now;
	now.w=tot;
	now.l=l;
	now.r=r;
	q.push(now);	
	
//	 cout <<"add "<< now.l << ' ' << now.r <<' '<< now.w << endl;
}

int main()
{
//	freopen("qc.in","r",stdin);
	memset(wait,0,sizeof(wait));
	memset(w,0,sizeof(w));
	
	scanf("%d%d%d",&n,&m,&k);
	for (int i=1;i<=n-1;i++)
		scanf("%d",&d[i]);
	for (int i=1;i<=m;i++)
	{	
		scanf("%d%d%d",&t[i].t,&t[i].l,&t[i].r);
		wait[t[i].l]=max(wait[t[i].l],t[i].t);	
		w[t[i].r]++;
	}
	end[1]=0;
	for (int i=2;i<=n;i++)
	   end[i]=max(end[i-1],wait[i-1])+d[i-1];
	ans=0;
	for (int i=1;i<=m;i++)
	   ans+=end[t[i].r]-t[i].t;
	
	sum[1]=sum[0]=0;
	for (int i=2;i<=n;i++) {sum[i]=sum[i-1]+w[i]; wait[i]=max(wait[i-1],wait[i]);}
	
//	for (int i=0;i<=n;i++) cout<<end[i]<<' ';
//	cout<<endl;
	   
	
	int tot=d[1],head=1;
	for (int i=2;i<=n;i++)
	{
		if (wait[i]>=end[i]) 
		{
			if (tot) push(head,i);
			tot=0;
			head=i;			
		}
		tot+=d[i];
		/*	
		tot+=w[i]*min(1,d[i]);
//		tot+=w[i];
		*/		
	}
	
	
	if (tot) push(head,n);
	
	
//00	cout<<ans<<endl;
	//贪心
//	sort(t+1,t+m+1,cmp);
    	
// 调试 
/*   while( !q.empty() ){
        cout << q.top().l << ' ' << q.top().r <<' '<< q.top().w << endl;
        q.pop();
	}
*/	
/*	
	for (int i=1;i<=n;i++) 
	{
		cout<<end[i]<<' ';		
	}
*/	
	while (k&&!q.empty()) 
	{
/*	cout<<"/////////"<<endl;	
	for (int i=1;i<=n;i++) 
	{
		cout<<end[i]<<' ';		
	}
	cout<<endl;
	for (int i=1;i<=n;i++) 
	{
		cout<<wait[i]<<' ';		
	}
	
	cout<<endl;
*/	
		interval now=q.top();
		q.pop();
		ans-=now.w;
		int i=now.l;
//000
//     cout << now.l << ' ' << now.r <<' '<< now.w << endl;
//      cout << ans << endl;
//000


		while (!d[i]) i++; 
		d[i]--;  
		int head=i,tot=0,i2=0;
		i++;
		while (i<=now.r/*&&wait[i]<end[i]*/) 
		{		
		//	tot+=w[i-1];
			end[i]--;	
			//000
//		    for (int cse=1;cse<=n;cse++) cout<<end[cse]<<',';
//			cout<<endl;
			//-
//			cout<<i<<endl;
//			cout<<wait[i+1]<<' '<<end[i+1]<<endl;
			if (wait[i]==end[i]) 
			    {push(head,i);head=i;}
			i++;
		}
		
		i--;
		if (head!=now.r) push(head,now.r);
		
/*
		if (i>now.r) {cout<<"smile"<<endl;
			cout<<'<'<<' '<<i<<' '<<wait[i]<<' '<<end[i]<<' '<<endl;}
*/
//		cout<<"i2:"<<i2<<endl;
/*		if (i2) i=i2; 
		i--;
		push(head,i);
		if (i<now.r)
		{
//			if (!d[head]) tot+=w[head];
			push(i,now.r);
		}
*/			
			
		//处理 end[i] 显然最多影响到 now.r 
		k--;
	}
	
	cout<<ans<<'\n';


// 调试 
/*
	    while( !q.empty() ){
        cout << q.top().l << ' ' << q.top().r <<' '<< q.top().w << endl;
        q.pop();
	}
	for (int i=1;i<=n;i++) 
	{
		cout<<end[i]<<' ';		
	}

	
	
*/	

	
//	while (1);

}


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