#include <iostream>
#include <set>
using namespace std;
int main()
{
int n;
cin >> n;
int grades[n];
int maxi = -1;
for (int i = 0; i < n; ++i)
{
cin >> grades[i];
if (grades[i] == n)
maxi = i;
}
set<int> median;
int possible = 0;
for (int i = 0; i <= maxi; ++i)
median.insert(grades[i]);
for (int i = 0; i <= maxi; ++i)
{
for (int j = maxi; j < n; ++j)
{
median.insert(grades[j]);
if (median.size() % 2)
{
auto l = median.end();
--l;
for (int a = 0; a < median.size() / 2; ++a)
--l;
if (*l * 2 + (j - i + 1) == 2 * n + 1)
possible++;
}
else
{
auto l = median.end();
auto r = median.end();
--l;
for (int a = 0; a < median.size() / 2; ++a)
{
--l; --r;
}
if (*l + *r + (j - i + 1) == 2 * n + 1)
possible++;
}
}
for (int j = maxi; j < n; ++j)
median.erase(grades[j]);
median.erase(grades[i]);
}
cout << 2 * n + 1 << " " << possible << "\n";
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 | #include <iostream> #include <set> using namespace std; int main() { int n; cin >> n; int grades[n]; int maxi = -1; for (int i = 0; i < n; ++i) { cin >> grades[i]; if (grades[i] == n) maxi = i; } set<int> median; int possible = 0; for (int i = 0; i <= maxi; ++i) median.insert(grades[i]); for (int i = 0; i <= maxi; ++i) { for (int j = maxi; j < n; ++j) { median.insert(grades[j]); if (median.size() % 2) { auto l = median.end(); --l; for (int a = 0; a < median.size() / 2; ++a) --l; if (*l * 2 + (j - i + 1) == 2 * n + 1) possible++; } else { auto l = median.end(); auto r = median.end(); --l; for (int a = 0; a < median.size() / 2; ++a) { --l; --r; } if (*l + *r + (j - i + 1) == 2 * n + 1) possible++; } } for (int j = maxi; j < n; ++j) median.erase(grades[j]); median.erase(grades[i]); } cout << 2 * n + 1 << " " << possible << "\n"; return 0; } |
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