Submission #18745392

---

Source Code Expand

#include <bits/stdc++.h>
using namespace std;
using ll = long long;

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

  ll N; cin >> N;
  ll M; cin >> M;
  if (M == 0) {
    cout << 1 << '\n';
    return 0;
  }

  vector<ll> A(M + 2); for (ll i = 0; i < M; i++) cin >> A[i];
  A[M] = N + 1;
  A[M + 1] = 0;
  sort(A.begin(), A.end());

  ll l = 1, r = N;
  ll ans = N - M;
  while (l + 1 < r) {
    ll m = (l + r) / 2;
    ll i = 0;
    ll cnt = 0;
    bool ok = true;
    for (ll i = 0; i < M + 1; i++) {
      ll s = A[i] + 1;
      ll e = A[i + 1];
      if (e - s > 0 && e - s < m) {
        ok = false;
        break;
      }
      cnt += (e - s + m - 1) / m;
    }
    if (ok) {
      ans = min(ans, cnt);
      l = m;
    } else {
      r = m;
    }
  }
  cout << ans << '\n';
  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:25:8: warning: unused variable ‘i’ [-Wunused-variable]
   25 |     ll i = 0;
      |        ^

Judge Result