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50
S2OJ/1466/1466.cpp
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S2OJ/1466/1466.cpp
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#include <iostream>
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#include <algorithm>
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#include <functional>
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#include <iomanip>
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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 = 55;
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const double eps = 1e-10;
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int n, c, k, a[N];
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bool check(double x) {
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int t = std::lower_bound(a + 1, a + 1 + n, static_cast<int>(x), std::greater<int>()) - a;
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if (n + c - (n - t + 1) < k) return false; // 最坏情况时无法满足要求
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int cnt = 0;
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for (int i = 1; i <= t; i++) {
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cnt += a[i] / x; // 能拆成几个满足要求的
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}
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return cnt >= k;
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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 >> c >> k;
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for (int i = 1; i <= n; i++) {
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cin >> a[i];
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}
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std::sort(a + 1, a + 1 + n, std::greater<int>());
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double l = 0, r = 1e9;
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for (int i = 0; i < 1000; i++) {
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double mid = (l + r) / 2;
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(check(mid) ? l : r) = mid;
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}
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cout << std::fixed << std::setprecision(12) << l << endl;
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return 0;
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}
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