Submission #480056

#	Time	Username	Problem	Language	Result	Execution time	Memory
480056		NachoLibre	Po (COCI21_po)	C++17	20 / 70	53 ms	6332 KiB

Main

#include <bits/stdc++.h>
#define ll long long
#define sz(x) ((int)x.size())
using namespace std;

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	int n;
	cin >> n;
	vector<int> a(n + 1);
	vector<pair<int, int>> b(n + 1);
	for(int i = 1; i <= n; ++i) {
		cin >> a[i];
		b[i].first = a[i];
		b[i].second = i;
	}
	sort(b.begin() + 1, b.end());
	set<int> s;
	s.insert(n + 1);
	int ans = 0;
	for(int i = 1; i <= n; ) {
		int j = i;
		for(int ii = i; ii <= n; ++ii) {
			if(b[ii].first != b[i].first) break;
			j = ii;
		}
		++ans;
		for(int k = i + 1; k <= j; ++k) {
			int x = *s.upper_bound(b[k - 1].second);
			int y = *s.upper_bound(b[k].second);
			ans += (x != y);
		}
		for(int k = i; k <= j; ++k) {
			s.insert(b[k].second);
		}
		i = j + 1;
	}
	cout << ans << endl;
	return 0;
}

• Subtask 1: 20 / 70