#include"bits/stdc++.h" using namespace std; #define int long long #define rep(i,n) for(int i=0;i P; int p[100006]; vector

seg[400]; int segmax[400]; int n, k, sqrtN; void maekei() { rep(i, k) { for (int j = i*sqrtN; j < min((i + 1)*sqrtN, n); j++) { segmax[i] = max(segmax[i], p[j]); int cnt = 0, mn = p[j]; for (int l = i*sqrtN; l < min((i + 1)*sqrtN, n); l++) { if (mn <= p[l]) { cnt++; mn = p[l]; } } seg[i].push_back(P(p[j], cnt)); } sort(seg[i].begin(), seg[i].end()); } } int calseg(int l, int r) { int mx = p[l]; int ans = 0; rep(i, k) { int L = i*sqrtN, R = (i + 1)*sqrtN; if (R <= l || r <= L)continue; if (l <= L&&R <= r) { auto p = lower_bound(seg[i].begin(), seg[i].end(), P(mx, inf)); if (p != seg[i].end()) { ans += (*p).second; mx = segmax[i]; } } else { for (int j = max(L, l); j < min(R, r); j++) { if (mx < p[j]) { ans++; mx = p[j]; } } } } return ans; } int divseg() { int res = 0; maekei(); vector

V; rep(i, n)V.push_back(P(p[i], i)); sort(V.begin(), V.end()); setS; S.insert(n); rep(i, n) { int r = *S.lower_bound(V[i].second); res += calseg(V[i].second, r); S.insert(V[i].second); } return res; } signed main() { cin.tie(0); ios::sync_with_stdio(false); cin >> n; sqrtN = sqrt(n); k = (n + sqrtN - 1) / sqrtN; rep(i, n)cin >> p[i]; int res=divseg(); reverse(p, p + n); rep(i,400) { seg[i].clear(); segmax[i] = 0; } res += divseg(); cout << res << endl; }