Submission #288046

#	Time	Username	Problem	Language	Result	Execution time	Memory
288046		bensonlzl	Bigger segments (IZhO19_segments)	C++14	100 / 100	127 ms	25952 KiB

segments

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<ll,ll> pl;
typedef pair<ll,pl> pll;

ll N, A[500005], P[500005], dp[500005];
pl bestr;

priority_queue<pll,vector<pll>,greater<pll> > pq;


int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cin >> N;
	for (int i = 1; i <= N; ++i){
		cin >> A[i];
		P[i] = A[i] + P[i-1];
	}
	bestr = pl(0,0);
	for (int i = 1; i <= N; ++i){
		while (!pq.empty()){
			pll x = pq.top();
			if (x.first <= P[i]){
				bestr = max(bestr,x.second);
				pq.pop();
			}
			else break;
		}
		dp[i] = bestr.first+1;
		pq.push(pll(2*P[i]-P[bestr.second],pl(dp[i],i)));
	}
	cout << dp[N] << '\n';
}

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