#include <bits/stdc++.h>
#define ll long long
#define str string
#define pii pair<int, int>
#define pll pair<ll, ll>
#define fi first
#define se second
#define vc vector<char>
#define vvc vector<vc>
#define vi vector<int>
#define vvi vector<vi>
#define vvvi vector<vvi>
#define vvvvi vector<vvvi>
#define vll vector<ll>
#define vvll vector<vll>
#define vvvll vector<vvll>
#define vvvvll vector<vvvll>
#define vs vector<str>
#define vvs vector<vs>
#define vpii vector<pii>
#define vvpii vector<vpii>
#define vpll vector<pll>
#define vvpll vector<vpll>
#define vb vector<bool>
#define vvb vector<vb>
#define rep(i, a, b) for (int i = (a); i < int(b); i++)
#define repi(i, a, b) for (int i = (a); i <= int(b); i++)
using namespace std;
void solve() {
int n; cin >> n;
vi a(n);
vi pos(n);
rep(i, 0, n) {
cin >> a[i];
a[i]--;
pos[a[i]] = i;
}
int best = 2 * n + 1;
if (n == 1) {
cout << best << " " << 1 << endl;
return;
}
int l = pos[n - 1];
int r = pos[n - 1];
ll cnt = 2; // n alone and the whole array
for (int x = n - 2; x > 0; x--) {
l = min(l, pos[x]);
r = max(r, pos[x]);
if (pos[x - 1] > l && pos[x - 1] < r)
continue;
int maxlen = 2 * (n - x) - 1;
if (pos[x - 1] < l) {
for (int i = pos[x - 1] + 1; i <= l; i++) {
if (i + maxlen - 1 < r)
continue;
int nr = min(n - 1, i + maxlen - 1);
cnt += (ll)(nr - r + 1);
}
}
else {
for (int i = pos[x - 1] - 1; i >= r; i--) {
if (i - maxlen + 1 > l)
continue;
int nl = max(0, i - maxlen + 1);
cnt += (ll)(l - nl + 1);
}
}
}
cout << best << " " << cnt << endl;
}
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
bool _multipleTestCases = false;
if (_multipleTestCases) {
ll t; cin >> t;
while (t--)
solve();
}
else {
solve();
}
return 0;
}
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 | #include <bits/stdc++.h> #define ll long long #define str string #define pii pair<int, int> #define pll pair<ll, ll> #define fi first #define se second #define vc vector<char> #define vvc vector<vc> #define vi vector<int> #define vvi vector<vi> #define vvvi vector<vvi> #define vvvvi vector<vvvi> #define vll vector<ll> #define vvll vector<vll> #define vvvll vector<vvll> #define vvvvll vector<vvvll> #define vs vector<str> #define vvs vector<vs> #define vpii vector<pii> #define vvpii vector<vpii> #define vpll vector<pll> #define vvpll vector<vpll> #define vb vector<bool> #define vvb vector<vb> #define rep(i, a, b) for (int i = (a); i < int(b); i++) #define repi(i, a, b) for (int i = (a); i <= int(b); i++) using namespace std; void solve() { int n; cin >> n; vi a(n); vi pos(n); rep(i, 0, n) { cin >> a[i]; a[i]--; pos[a[i]] = i; } int best = 2 * n + 1; if (n == 1) { cout << best << " " << 1 << endl; return; } int l = pos[n - 1]; int r = pos[n - 1]; ll cnt = 2; // n alone and the whole array for (int x = n - 2; x > 0; x--) { l = min(l, pos[x]); r = max(r, pos[x]); if (pos[x - 1] > l && pos[x - 1] < r) continue; int maxlen = 2 * (n - x) - 1; if (pos[x - 1] < l) { for (int i = pos[x - 1] + 1; i <= l; i++) { if (i + maxlen - 1 < r) continue; int nr = min(n - 1, i + maxlen - 1); cnt += (ll)(nr - r + 1); } } else { for (int i = pos[x - 1] - 1; i >= r; i--) { if (i - maxlen + 1 > l) continue; int nl = max(0, i - maxlen + 1); cnt += (ll)(l - nl + 1); } } } cout << best << " " << cnt << endl; } int main() { ios::sync_with_stdio(false); cin.tie(nullptr); bool _multipleTestCases = false; if (_multipleTestCases) { ll t; cin >> t; while (t--) solve(); } else { solve(); } return 0; } |
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