#include <iostream>
#include <deque>
#include <vector>
using namespace std;
int main() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
int n;
cin >> n;
vector<int> pearls;
pearls.resize(n);
deque<int> maxs;
for (int i = 0; i < n; ++i) {
cin >> pearls[i];
if (maxs.empty() || maxs.back() < pearls[i]) {
maxs.push_back(pearls[i]);
}
}
int res = ssize(maxs);
for (int i = n - 1; i > 0; --i) {
while (!maxs.empty() && maxs.front() <= pearls[i]) {
maxs.pop_front();
}
maxs.push_front(pearls[i]);
if (res < ssize(maxs)) {
res = ssize(maxs);
}
}
cout << res << "\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 | #include <iostream> #include <deque> #include <vector> using namespace std; int main() { ios_base::sync_with_stdio(false); cin.tie(nullptr); int n; cin >> n; vector<int> pearls; pearls.resize(n); deque<int> maxs; for (int i = 0; i < n; ++i) { cin >> pearls[i]; if (maxs.empty() || maxs.back() < pearls[i]) { maxs.push_back(pearls[i]); } } int res = ssize(maxs); for (int i = n - 1; i > 0; --i) { while (!maxs.empty() && maxs.front() <= pearls[i]) { maxs.pop_front(); } maxs.push_front(pearls[i]); if (res < ssize(maxs)) { res = ssize(maxs); } } cout << res << "\n"; } |
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