Submission #1258614

#	Time	Username	Problem	Language	Result	Execution time	Memory
1258614		namhh	Bigger segments (IZhO19_segments)	C++20	100 / 100	54 ms	15944 KiB

segments

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define pii pair<int,int>
#define fi first
#define se second
const int N = 5e5+5;
int n,a[N],pre[N];
pii dp[N];
signed main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cin >> n;
	for(int i = 1; i <= n; i++){
		cin >> a[i];
		pre[i] = pre[i-1]+a[i];
	}
	dp[1] = {1,0};
	for(int i = 1; i <= n; i++){
		dp[i] = max(dp[i],dp[i-1]);
		int l = i;
		int r = n;
		int res = -1;
		while(l <= r){
			int mid = (l+r)/2;
			if(pre[mid]-pre[i] >= pre[i]-pre[dp[i].se]){
				res = mid;
				r = mid-1;
			}
			else l = mid+1;
		}
		if(res != -1) dp[res] = max(dp[res],{dp[i].fi+1,i});
	}
	cout << dp[n].fi;
}

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