Submission #684102

#	Time	Username	Problem	Language	Result	Execution time	Memory
684102		GudStonks	Bigger segments (IZhO19_segments)	C++17	100 / 100	88 ms	20860 KiB

segments

#include<bits/stdc++.h>
using namespace std;
#define ll long long
ll n, arr[500005];
pair<ll, ll>dp[500005];

void fun(){
	cin>>n;
	vector<ll>pr(n);
	for(int i = 1; i <= n; i++){
		cin>>arr[i];
		if(i > 1)
			pr[i - 1] = pr[i - 2];
		pr[i - 1] += arr[i];
	}
	dp[1] = {1, -arr[1]};
	for(int i = 1; i <= n; i++){
		dp[i] = max(dp[i], {dp[i - 1].first, -(-dp[i - 1].second + arr[i])});
		ll next = lower_bound(pr.begin(), pr.end(), pr[i - 1] + (-dp[i].second)) - pr.begin() + 1;
		if(next > n)continue;
		dp[next] = max(dp[next], {dp[i].first + 1, -(pr[next - 1] - pr[i - 1])});
	}
	cout<<dp[n].first;
}

int main(){
	ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	int ttt = 1;
	//cin>>ttt;
	while(ttt--)fun();
}

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