Submission #1949361

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Source Code Expand

#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <exception>
#include <fstream>
#include <functional>
#include <iomanip>
#include <ios>
#include <iosfwd>
#include <iostream>
#include <istream>
#include <iterator>
#include <limits>
#include <list>
#include <locale>
#include <map>
#include <memory>
#include <new>
#include <numeric>
#include <ostream>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <stdexcept>
#include <streambuf>
#include <string>
#include <typeinfo>
#include <utility>
#include <valarray>
#include <vector>
#include <climits>

#define rep(i, m, n) for(int i=int(m);i<int(n);i++)
#define EACH(i, c) for (auto &(i): c)
#define all(c) begin(c),end(c)
#define EXIST(s, e) ((s).find(e)!=(s).end())
#define SORT(c) sort(begin(c),end(c))
#define pb emplace_back
#define MP make_pair
#define SZ(a) int((a).size())

//#define LOCAL 0
//#ifdef LOCAL
//#define DEBUG(s) cout << (s) << endl
//#define dump(x)  cerr << #x << " = " << (x) << endl
//#define BR cout << endl;
//#else
//#define DEBUG(s) do{}while(0)
//#define dump(x) do{}while(0)
//#define BR
//#endif


//改造
typedef long long int ll;
using namespace std;
#define INF (1 << 30)
#define INFl (ll)5e15
#define DEBUG 0 //デバッグする時1にしてね
#define dump(x)  cerr << #x << " = " << (x) << endl
#define MOD 1000000007
//ここから編集する


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

    int N;
    ll H;
    cin >> N >> H;
    vector<ll> a(N),b(N);
    rep(i,0,N){
        cin >> a[i];
        cin >> b[i];
    }

    ll sum_d = 0LL;
    sort(all(a));
    sort(all(b));
    ll ans = 0LL;
    ll max_a = a[a.size()-1];
    for(int i = a.size() - 1;i >= 0;i--){
        if(max_a >= b[i]) break;
        if(sum_d >= H) break;
        ans++;
        sum_d += b[i];
    }

    if(sum_d < H){
        ll diff = H - sum_d;
        ans += diff/max_a;
        ans += !!(diff%max_a);
    }

    cout  << ans << endl;






    return 0;
}

Submission Info

Judge Result