Submission #1949069

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Source Code Expand

#include <bits/stdc++.h>

using namespace std;

#define int long long
#define all(v) (v).begin(), (v).end()
#define resz(v, ...) (v).clear(), (v).resize(__VA_ARGS__)
#define reps(i, m, n) for(int i = (int)(m); i < (int)(n); i++)
#define rep(i, n) reps(i, 0, n)

template<class T1, class T2> void chmin(T1 &a, T2 b){if(a>b)a=b;}
template<class T1, class T2> void chmax(T1 &a, T2 b){if(a<b)a=b;}

using Pi = pair<int, int>;
using Ti = tuple<int, int, int>;
using vint = vector<int>;

const int inf = 1LL << 55;
const int mod = 1e9 + 7;

signed main() {
  cin.tie(0);
  ios_base::sync_with_stdio(0);
  cout << fixed << setprecision(12);

  int n, h;
  cin >> n >> h;
  vint a(n), b(n);
  rep(i, n) cin >> a[i] >> b[i];
  sort(all(a));
  reverse(all(a));
  sort(all(b));
  reverse(all(b));
  b.push_back(0);
  int ans = inf;
  int sum = 0;
  rep(i, n+1) {
    chmin(ans, i+(h-sum+a[0]-1)/a[0]);
    sum += b[i];
    //cout<<ans<<endl;
  }
  cout << ans << endl;

  return 0;
}

Submission Info

Judge Result