#include <bits/stdc++.h>
using i64 = long long;
using u64 = unsigned long long;
using u32 = unsigned;
using u128 = unsigned __int128;
using i128 = __int128;
int main() {
std::ios::sync_with_stdio(false);
std::cin.tie(nullptr);
int n;
std::cin >> n;
std::vector<int> a(n);
for (int i = 0; i < n; i++) {
std::cin >> a[i];
}
std::vector<int> stk;
int ans = 0;
for (int t = 0; t < 2; t++) {
for (int i = n - 1; i >= 0; i--) {
while (!stk.empty() && stk.back() <= a[i]) {
stk.pop_back();
}
stk.push_back(a[i]);
ans = std::max(ans, int(stk.size()));
}
}
std::cout << ans << "\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 | #include <bits/stdc++.h> using i64 = long long; using u64 = unsigned long long; using u32 = unsigned; using u128 = unsigned __int128; using i128 = __int128; int main() { std::ios::sync_with_stdio(false); std::cin.tie(nullptr); int n; std::cin >> n; std::vector<int> a(n); for (int i = 0; i < n; i++) { std::cin >> a[i]; } std::vector<int> stk; int ans = 0; for (int t = 0; t < 2; t++) { for (int i = n - 1; i >= 0; i--) { while (!stk.empty() && stk.back() <= a[i]) { stk.pop_back(); } stk.push_back(a[i]); ans = std::max(ans, int(stk.size())); } } std::cout << ans << "\n"; return 0; } |
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