#include <bits/stdc++.h>
void update_vis(bool *vis, int &it) {
while (vis[it])
--it;
return;
}
int main() {
std::ios_base::sync_with_stdio(false);
std::cin.tie(nullptr);
std::cout.tie(nullptr);
int n;
std::cin >> n;
auto *tab = new int [n + 1];
for (int i = 0; i < n; ++i) {
int input;
std::cin >> input;
tab[input] = i;
}
int l = tab[n], r = tab[n];
long long score = 1;
for (int len = 2; len <= n; ++len) {
l = std::min(l, tab[n - (len / 2)]);
r = std::max(r, tab[n - (len / 2)]);
if (r - l + 1 > len) continue;
long long sub_r = std::min(l + len - 1, n - 1);
long long sub_l = std::max(r - len + 1, 0);
score += sub_r - sub_l - len + 2;
}
std::cout << 2 * n + 1 << " " << score;
delete [] tab;
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 | #include <bits/stdc++.h> void update_vis(bool *vis, int &it) { while (vis[it]) --it; return; } int main() { std::ios_base::sync_with_stdio(false); std::cin.tie(nullptr); std::cout.tie(nullptr); int n; std::cin >> n; auto *tab = new int [n + 1]; for (int i = 0; i < n; ++i) { int input; std::cin >> input; tab[input] = i; } int l = tab[n], r = tab[n]; long long score = 1; for (int len = 2; len <= n; ++len) { l = std::min(l, tab[n - (len / 2)]); r = std::max(r, tab[n - (len / 2)]); if (r - l + 1 > len) continue; long long sub_r = std::min(l + len - 1, n - 1); long long sub_l = std::max(r - len + 1, 0); score += sub_r - sub_l - len + 2; } std::cout << 2 * n + 1 << " " << score; delete [] tab; return 0; } |
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