Submission #475402

#	Time	Username	Problem	Language	Result	Execution time	Memory
475402		ismoilov	Bigger segments (IZhO19_segments)	C++14	100 / 100	100 ms	18884 KiB

segments

#include<bits/stdc++.h>

using namespace std;

typedef unsigned long long ll;
#define IOS ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);

void S()
{
	int n;
	cin >> n;
	vector <ll> a(n+2), dp(n+2), pr(n+2);
	vector <int> best(n+2);
	for(int i = 1; i <= n; i ++){
		cin >> a[i];
		pr[i] = pr[i-1] + a[i];
	}
	for(int i = 1; i <= n; i ++){
		best[i] = max(best[i], best[i-1]);
		dp[i] = dp[best[i]] + 1;
		ll cur = pr[i] * 2 - pr[best[i]];
		int x = lower_bound(pr.begin()+1, pr.begin()+n+1, cur) - pr.begin();
		best[x] = max(best[x], i);
	}
	cout << dp[n];
}

int main()
{
	IOS;
	/*int t;
	cin >> t;
	while(t --)*/
		S();
}

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