Submission #1947804

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Source Code Expand

#define _USE_MATH_DEFINES
#include <cstdio>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <complex>
#include <string>
#include <vector>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <limits>
#include <climits>
#include <cfloat>
#include <functional>
#include <iterator>
using namespace std;

int main()
{
    int n, h;
    cin >> n >> h;
    vector<int> a(n), b(n);
    for(int i=0; i<n; ++i)
        cin >> a[i] >> b[i];
    sort(a.rbegin(), a.rend());
    sort(b.rbegin(), b.rend());

    long long ans = (h + a[0] - 1) / a[0];
    long long sum = 0;
    for(int i=0; i<n; ++i){
        sum += b[i];
        long long rest = max(0ll, h - sum);
        ans = min(ans, i + 1 + (rest + a[0] - 1) / a[0]);
    }
    cout << ans << endl;

    return 0;
}

Submission Info

Judge Result