Submission #906922

#	Time	Username	Problem	Language	Result	Execution time	Memory
906922		daoquanglinh2007	Money (IZhO17_money)	C++17	100 / 100	1303 ms	58308 KiB

money

#include <bits/stdc++.h>
using namespace std;

const int NM = 1e6, inf = 1e9+7;

int N, a[NM+5], ans = 0;
set <int> S;
set <int>::iterator it;

int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	
	cin >> N;
	for (int i = 1; i <= N; i++) cin >> a[i];
	
	for (int i = 1; i <= N; i++){
		int j = i, l, r;
		if (S.empty()) l = -inf, r = +inf;
		else if (a[i] < *S.begin()) l = -inf, r = *S.begin();
		else if (a[i] >= *(--S.end())) l = *(--S.end()), r = +inf;
		else{
			it = S.upper_bound(a[i]);
			r = *it;
			it--;
			l = *it;
		}
		while (j <= N && a[j] >= l && a[j] <= r){
			S.insert(a[j]);
			l = a[j];
			j++;
		}
		ans++;
		i = j-1;
	}
	cout << ans;
	return 0;
}

• Subtask 1: 9 / 9
• Subtask 2: 16 / 16
• Subtask 3: 20 / 20
• Subtask 4: 55 / 55