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D - Chat Program
https://codeforces.com/gym/104128/submission/192554094
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Gym/104128/D/D.cpp
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74
Gym/104128/D/D.cpp
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#include <iostream>
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#include <algorithm>
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#include <cmath>
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#include <functional>
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#include <iterator>
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#include <numeric>
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#include <vector>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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const int N = 2e5 + 5;
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int n, k, m;
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long long c, d;
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std::vector<long long> a;
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bool check(long long x) {
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std::vector<long long> s(n);
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for (int i = 0; i < n; i++) {
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if (a[i] >= x) {
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s[0]++;
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continue;
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}
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if (d == 0) {
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if (a[i] + c >= x) {
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s[std::max(0, i - m + 1)]++;
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if (i + 1 < n) s[i + 1]--;
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}
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continue;
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}
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int l = std::max(0, i - m + 1),
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r = std::max(l, std::min(i + 1, i - static_cast<int>(std::ceil(static_cast<double>(x - a[i] - c) / d)) + 1));
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s[l]++;
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if (r < n) s[r]--;
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}
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std::partial_sum(s.begin(), s.end(), s.begin());
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return std::count_if(s.begin(), s.end(), std::bind(std::greater_equal<>(), std::placeholders::_1, k)) > 0;
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}
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int main() {
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std::ios::sync_with_stdio(false);
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cin.tie(nullptr);
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cin >> n >> k >> m >> c >> d;
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std::copy_n(std::istream_iterator<decltype(a)::value_type>(cin), n, std::back_inserter(a));
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long long l = 0, r = 1e18, res = 0;
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while (l <= r) {
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long long mid = (l + r) >> 1;
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if (check(mid)) {
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l = mid + 1;
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res = mid;
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} else {
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r = mid - 1;
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}
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}
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cout << res << endl;
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return 0;
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}
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