#include <bits/stdc++.h>
using namespace std;
#define st first
#define nd second
#define iamspeed ios_base :: sync_with_stdio(0); cin.tie(0); cout.tie(0)
long long n, t[1000006], ind[1000006], l, r, res = 1, odl, x, wiel;
int main()
{
iamspeed;
cin >> n;
for(int i = 1 ; i <= n ; i++)
{
cin >> t[i];
ind[t[i]] = i;
}
l = r = ind[n];
for(int i = 2 ; i <= n ; i++)
{
if(i % 2 == 0)
{
l = min(ind[n - (i / 2)], l);
r = max(ind[n - (i / 2)], r);
odl = r - l + 1;
}
if(odl > i) continue;
else
{
wiel = min(n, l + i - 1) - max(1LL, r - i + 1) + 1 - i + 1;
res += wiel;
}
}
cout << 2 * n + 1 << " " << res << endl;
}
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 | #include <bits/stdc++.h> using namespace std; #define st first #define nd second #define iamspeed ios_base :: sync_with_stdio(0); cin.tie(0); cout.tie(0) long long n, t[1000006], ind[1000006], l, r, res = 1, odl, x, wiel; int main() { iamspeed; cin >> n; for(int i = 1 ; i <= n ; i++) { cin >> t[i]; ind[t[i]] = i; } l = r = ind[n]; for(int i = 2 ; i <= n ; i++) { if(i % 2 == 0) { l = min(ind[n - (i / 2)], l); r = max(ind[n - (i / 2)], r); odl = r - l + 1; } if(odl > i) continue; else { wiel = min(n, l + i - 1) - max(1LL, r - i + 1) + 1 - i + 1; res += wiel; } } cout << 2 * n + 1 << " " << res << endl; } |
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