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OI-codes/S2OJ/1866/1866.cpp

76 lines
1.5 KiB
C++

#include <iostream>
#include <algorithm>
#include <cmath>
#include <functional>
#include <iterator>
#include <numeric>
#include <vector>
using std::cin;
using std::cout;
const char endl = '\n';
const int N = 2e5 + 5;
int n, k, m;
long long c, d;
std::vector<long long> a;
bool check(long long x) {
std::vector<long long> s(n);
for (int i = 0; i < n; i++) {
if (a[i] >= x) {
s[0]++;
continue;
}
if (d == 0) {
if (a[i] + c >= x) {
s[std::max(0, i - m + 1)]++;
if (i + 1 < n) s[i + 1]--;
}
continue;
}
int l = std::max(0, i - m + 1),
r = std::max(l, std::min(i + 1, i - static_cast<int>(std::ceil(static_cast<double>(x - a[i] - c) / d)) + 1));
s[l]++;
if (r < n) s[r]--;
}
std::partial_sum(s.begin(), s.end(), s.begin());
return std::count_if(s.begin(), s.end(), std::bind(std::greater_equal<>(), std::placeholders::_1, k)) > 0;
}
int main() {
std::ios::sync_with_stdio(false);
cin.tie(nullptr);
cin >> n >> k >> m >> c >> d;
std::copy_n(std::istream_iterator<decltype(a)::value_type>(cin), n, std::back_inserter(a));
long long l = 0, r = 1e18, res = 0;
while (l <= r) {
long long mid = (l + r) >> 1;
if (check(mid)) {
l = mid + 1;
res = mid;
} else {
r = mid - 1;
}
}
cout << res << endl;
return 0;
}