Submission #707743

#	Time	Username	Problem	Language	Result	Execution time	Memory
707743		emptypringlescan	Bigger segments (IZhO19_segments)	C++17	100 / 100	103 ms	29120 KiB

segments

#include <bits/stdc++.h>
using namespace std;
int32_t main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	int n;
	cin >> n;
	long long arr[n],pref[n+1];
	for(int i=0; i<n; i++) cin >> arr[i];
	pref[0]=0;
	for(int i=0; i<n; i++){
		pref[i+1]=pref[i]+arr[i];
	}
	pair<int,long long> dp[n+1];
	dp[0]={0,0};
	vector<pair<int,long long> > mono;
	mono.push_back({0,0});
	for(int i=1; i<=n; i++){
		int lo=0,hi=mono.size()-1,mid;
		while(lo<hi){
			mid=(lo+hi+1LL)/2;
			if(mono[mid].second<=pref[i]) lo=mid;
			else hi=mid-1;
		}
		assert(mono[lo].second<=pref[i]);
		dp[i]={dp[mono[lo].first].first+1LL,pref[i]-pref[mono[lo].first]};
		while(!mono.empty()&&mono.back().second>=dp[i].second+pref[i]){
			mono.pop_back();
		}
		mono.push_back({i,dp[i].second+pref[i]});
	}
	cout << dp[n].first;
	return 0;
}

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