// Patryk Jędrzejczak
#include <bits/stdc++.h>
using namespace std;
#define REP(i, n) for(int i = 0; i < n; ++i)
#define REPR(i, n) for(int i = n - 1; i >= 0; --i)
#define FOR(i, a, b) for(int i = a; i < b; ++i)
#define FORR(i, a, b) for(int i = b - 1; i >= a; --i)
#define EB emplace_back
#define MP make_pair
#define ST first
#define ND second
#define S size
#define RS resize
#define endl '\n'
#define L long long
template<class T> using V = vector<T>;
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
int n;
cin >> n;
V<int> a(n);
V<int> p(n + 1);
REP(i, n) {
cin >> a[i];
p[a[i]] = i;
}
int l = p[n], r = p[n];
L res = 1;
int d = 1;
FORR(v, 1, n) {
l = min(l, p[v]);
r = max(r, p[v]);
d++;
//cout << "v: " << v << " l: " << l << " r: " << r << " d: " << d << " res: " << res << '\n';
if (d <= n && r - l + 1 <= d) {
int lk = max(0, r - d + 1);
int rk = min(n - 1, l + d - 1);
res += (L)(rk - lk - d + 2);
}
d++;
//cout << "v: " << v << " l: " << l << " r: " << r << " d: " << d << " res: " << res << '\n';
if (d <= n && r - l + 1 <= d) {
int lk = max(0, r - d + 1);
int rk = min(n - 1, l + d - 1);
res += (L)(rk - lk - d + 2);
}
}
cout << 2 * n + 1 << ' ' << res;
}
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 | // Patryk Jędrzejczak #include <bits/stdc++.h> using namespace std; #define REP(i, n) for(int i = 0; i < n; ++i) #define REPR(i, n) for(int i = n - 1; i >= 0; --i) #define FOR(i, a, b) for(int i = a; i < b; ++i) #define FORR(i, a, b) for(int i = b - 1; i >= a; --i) #define EB emplace_back #define MP make_pair #define ST first #define ND second #define S size #define RS resize #define endl '\n' #define L long long template<class T> using V = vector<T>; int main() { ios_base::sync_with_stdio(false); cin.tie(NULL); int n; cin >> n; V<int> a(n); V<int> p(n + 1); REP(i, n) { cin >> a[i]; p[a[i]] = i; } int l = p[n], r = p[n]; L res = 1; int d = 1; FORR(v, 1, n) { l = min(l, p[v]); r = max(r, p[v]); d++; //cout << "v: " << v << " l: " << l << " r: " << r << " d: " << d << " res: " << res << '\n'; if (d <= n && r - l + 1 <= d) { int lk = max(0, r - d + 1); int rk = min(n - 1, l + d - 1); res += (L)(rk - lk - d + 2); } d++; //cout << "v: " << v << " l: " << l << " r: " << r << " d: " << d << " res: " << res << '\n'; if (d <= n && r - l + 1 <= d) { int lk = max(0, r - d + 1); int rk = min(n - 1, l + d - 1); res += (L)(rk - lk - d + 2); } } cout << 2 * n + 1 << ' ' << res; } |
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