Submission #786766

#	Time	Username	Problem	Language	Result	Execution time	Memory
786766		winter0101	Art Exhibition (JOI18_art)	C++14	100 / 100	174 ms	32548 KiB

art

#include <bits/stdc++.h>
using namespace std;
struct lena{
	long long a,b;
}a[500001];
long long pf[500001];
long long rl[500001];
long long sf[500001];
bool cmp(const lena &p, const lena &q){
	return p.a<q.a;
}
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    //freopen(".INP","r",stdin);
   // freopen(".OUT","w",stdout);
	int n;
	cin>>n;
	for (int i=1;i<=n;i++){
		cin>>a[i].a>>a[i].b;
	}
	sort(a+1,a+1+n,cmp);
	for (int i=1;i<=n;i++){
		pf[i]=pf[i-1]+a[i].b;
	}
	for (int i=1;i<=n;i++){
		rl[i]=pf[i]-a[i].a;
	}
	sf[n]=rl[n];
	for (int i=n-1;i>=1;i--){
		sf[i]=max(sf[i+1],rl[i]);
	}
	long long ans=-1e16;
	for (int i=1;i<=n;i++){
		ans=max(ans,sf[i]+a[i].a-pf[i-1]);
	}
	cout<<ans;
}

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 50 / 50