Submission #19642390

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#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define fcout cout << fixed << setprecision(18)
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  ll N; cin >> N;
  double M; cin >> M;
  ll K; cin >> K;
  vector<ll> A(N + 10, 0);
  for (ll i = 0; i < K; i++) {
    ll X; cin >> X;
    A[X] = 1;
  }
  double l = 0, r = 1e15;
  while (l + 0.000001 < r) {
 
 
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#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define fcout cout << fixed << setprecision(18)

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);

  ll N; cin >> N;
  double M; cin >> M;
  ll K; cin >> K;

  vector<ll> A(N + 10, 0);
  for (ll i = 0; i < K; i++) {
    ll X; cin >> X;
    A[X] = 1;
  }

  double l = 0, r = 1e15;
  while (l + 0.000001 < r) {
    double m = (l + r) / 2;
    vector<double> E(N + M + 10, 0);

    double sum = 0;
    for (ll i = N - 1; i >= 0; i--) {
      if (A[i] == 1) {
        E[i] = m;
      } else {
        sum += (E[i + 1] - E[i + M + 1]);
        E[i] = 1 + sum / M;
      }
    }
    if (E[0] > m) {
      l = m;
    } else {
      r = m;
    }
  }
  
  fcout << l << '\n';
  return 0;
}

Submission Info

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