Submission #1163142

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Source Code Expand

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

const int N = 202020;
int a[N], pr[N], ne[N], pos[N];

int main()
{
	int n;
	cin >> n;
	for (int i = 1; i <= n; ++i){
		cin >> a[i];
		pos[a[i]] = i;
	}

	for (int i = 0; i <= n + 1; ++i){
		pr[i] = i - 1;
		ne[i] = i + 1;
	}

	long long ans = 0;
	for (int i = n; i >= 1; i--){
		int j = pos[i];
		ans += i * 1ll * (j - pr[j]) * (ne[j] - j);
		pr[ne[j]] = pr[j];
		ne[pr[j]] = ne[j];
	}

	cout << ans << endl;
}

Submission Info

Judge Result