Submission #1295432

#	Time	Username	Problem	Language	Result	Execution time	Memory
1295432		hynmj	Self Study (JOI22_ho_t2)	C++20	0 / 100	214 ms	5528 KiB

Main

#include <bits/stdc++.h>
#define int long long
using namespace std;
const long long N = 300000 + 5;
int a[N];
int b[N];
int n, m;
bool possible(int k)
{
    int saved = 0;
    for (int i = 0; i < n; i++)
    {
        int needed = (k + a[i] - 1) / a[i];
        if (needed <= m)
        {
            saved += m - needed;
            continue;
        }
        int left = k - m * a[i];
        assert(left >= 0);
        int others = (left + b[i] - 1) / b[i];
        assert(others >= 0);
        saved -= others;
    }
    return saved >= 0;
}

bool satisfied(int k)
{
    int courses = 0;
    for (int i = 0; i < n; i++)
    {
        int usedA = min(m, (k + a[i] - 1) / a[i]);
        int left = k - usedA * a[i];
        int usedB = (left + b[i] - 1) / b[i];
        courses += usedA + usedB;
    }
    return courses <= n * m;
}
void solve()
{
    cin >> n >> m;
    for (int i = 0; i < n; i++)
    {
        cin >> a[i];
    }
    for (int i = 0; i < n; i++)
    {
        cin >> b[i];
        a[i] = max(a[i], b[i]);
    }
    int o = 0;
    for (int i = 62; i >= 0; i--)
    {
        int mask = 1ll << i;
        if (possible(o + mask) and satisfied(o + mask))
        {
            o += mask;
        }
        // cout << mask << endl;
    }
    cout << o;
    // cout << possible(38404721679817) << endl;
}

signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(NULL);
    cout.tie(NULL);
    int t = 1;
    // cin >> t;
    for (int i = 1; i <= t; i++)
    {
        // cout << "Case #" << i << ':' << ' ';
        solve();
        cout << endl;
    }
    return 0;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 25
• Subtask 3: 0 / 27
• Subtask 4: 0 / 29
• Subtask 5: 0 / 9