#include <iostream>
using namespace std;
#define ll long long int
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
ll n;
cin >> n;
ll* whereToFind = new ll[n]();
ll a;
for (ll i = 0; i < n; i++)
{
cin >> a;
whereToFind[a - 1] = i;
}
ll left = whereToFind[n - 1];
ll right = whereToFind[n - 1];
ll largestNotInRange = n - 2;
ll totalCount = 0;
for (ll i = 0; i < n; i++)
{
if (i % 2 == 1)
{
ll stretch = whereToFind[largestNotInRange];
if (stretch < left)
left = stretch;
if (stretch > right)
right = stretch;
largestNotInRange--;
}
ll desiredLength = i + 1;
ll currentLength = right - left + 1;
if (currentLength <= desiredLength)
{
ll toStretch = desiredLength - currentLength;
ll leftSpace = min(left, toStretch);
ll rightSpace = min(n - right - 1, toStretch);
ll addage = leftSpace + rightSpace - toStretch + 1;
if (addage > 0)
{
totalCount += addage;
}
}
}
cout << n * 2 + 1 << ' ' << totalCount << '\n';
}
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 | #include <iostream> using namespace std; #define ll long long int int main() { ios_base::sync_with_stdio(0); cin.tie(0); ll n; cin >> n; ll* whereToFind = new ll[n](); ll a; for (ll i = 0; i < n; i++) { cin >> a; whereToFind[a - 1] = i; } ll left = whereToFind[n - 1]; ll right = whereToFind[n - 1]; ll largestNotInRange = n - 2; ll totalCount = 0; for (ll i = 0; i < n; i++) { if (i % 2 == 1) { ll stretch = whereToFind[largestNotInRange]; if (stretch < left) left = stretch; if (stretch > right) right = stretch; largestNotInRange--; } ll desiredLength = i + 1; ll currentLength = right - left + 1; if (currentLength <= desiredLength) { ll toStretch = desiredLength - currentLength; ll leftSpace = min(left, toStretch); ll rightSpace = min(n - right - 1, toStretch); ll addage = leftSpace + rightSpace - toStretch + 1; if (addage > 0) { totalCount += addage; } } } cout << n * 2 + 1 << ' ' << totalCount << '\n'; } |
English