CF985E Pencils and Boxes

Lisa

尺取法搞一波

然后前缀和优化一波

#include<iostream>
#include<cstdio>
#include<cstring>
#include<cmath>
#include<algorithm>
using namespace std;
int a[500005];
bool f[500005];
int n,k,d;
int sum[500005];
int main(){
//	ios::sync_with_stdio(false);
	scanf("%d%d%d",&n,&k,&d);
	for(int i=1;i<=n;++i){
		cin>>a[i];
	}
	sort(a+1,a+n+1);
	int l=1;
	f[0]=1;
	sum[0]=1;
	for(int i=1;i<=n;++i){
		while(a[l]+d<a[i]) l++;
	//	for(int j=l;i-j+1>=k;++j){
	//		if(f[j-1]) {
	//			f[i]=1;
	//			break;
	//		}
	//	}
		if(i-k<0) {
		sum[i]=sum[i-1]+f[i];
		continue;
		}
		if(l-2<0){
			if(sum[i-k])
			f[i]=1;
		}else
		if(sum[i-k]-sum[l-2]>0){
			f[i]=1;
		}
			sum[i]=sum[i-1]+f[i];
	}
//	for(int i=1;i<=n;++i){
//		cout<<f[i]<<" "; 
//	}
	if(f[n]) cout<<"YES";
	else cout<<"NO";
	return 0;
}

标签：一波,Pencils,CF985E,sum,d%,int,Boxes,include,500005
来源： https://www.cnblogs.com/For-Miku/p/15416572.html