Submission #706894

#	Time	Username	Problem	Language	Result	Execution time	Memory
706894		ld_minh4354	Bigger segments (IZhO19_segments)	C++17	73 / 100	32 ms	7892 KiB

segments

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

#define fi first
#define se second
#define pb push_back
#define debug(x) cout<<#x<<": "<<x<<"\n"

signed main()
{
	ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
//	freopen("input.000","r",stdin);
//	freopen("output.000","w",stdout);
//	srand((unsigned)time(NULL));
//	rand()
	
	int n,i,a[100005],opt;
	long long pre[100005];
	pair<int,long long> dp[100005];
	priority_queue<pair<long long,int>> q;
	
	cin>>n;
	
	for (i=1;i<n+1;i++) cin>>a[i];
	pre[1]=a[1];
	for (i=2;i<n+1;i++) pre[i]=pre[i-1]+a[i];
	
	q.push({-1e18,0});
	dp[1]={1,-a[1]};
	q.push({-a[1]-pre[1], 1});
	opt=0;
	for (i=2;i<n+1;i++)
	{
		dp[i]={1,-pre[i]};
		
		while (abs(q.top().fi)<=pre[i])
		{
			opt=max(q.top().se, opt);
			q.pop();
		}
		
		if (opt!=0) dp[i]=max(dp[i], {dp[opt].fi+1, -pre[i]+pre[opt]});
		
		q.push({dp[i].se-pre[i], i});
	}
	
//	for (i=1;i<n+1;i++) cout<<dp[i].fi<<" "<<dp[i].se<<"\n";
	cout<<dp[n].fi;
}

• Subtask 1: 13 / 13
• Subtask 2: 14 / 14
• Subtask 3: 10 / 10
• Subtask 4: 36 / 36
• Subtask 5: 0 / 27