Submission #1253269

#	Time	Username	Problem	Language	Result	Execution time	Memory
1253269		DangKhoizzzz	Self Study (JOI22_ho_t2)	C++17	10 / 100	43 ms	5008 KiB

Main

#include <bits/stdc++.h>
#define int long long
#define fi first
#define se second
#define pii pair <int , int>
#define arr3 array <int , 3>

using namespace std;

const int INF = 1e18;
const int maxn = 1e6 + 7;


int n , m , a[maxn] , b[maxn];

bool check(int mid)
{
    int cnt = 0;
    int tot = n*m;
    for(int i = 1; i <= n; i++)
    {
        if(a[i] > b[i])
        {
            int c1 = min(m , (mid - 1)/a[i] + 1);
            tot -= c1;
            if(c1*a[i] < mid) cnt += (mid - c1*a[i] - 1)/b[i] + 1;
        }
        else cnt += (mid-1)/b[i] + 1;
    }
    return (cnt <= tot);
}

void solve()
{
    cin >> n >> m;
    for(int i = 1; i <= n; i++) cin >> a[i];
    for(int i = 1; i <= n; i++) cin >> b[i];

    if(m == 1)
    {
        int ans = INF;
        for(int i = 1; i <= n; i++) ans = min(ans , max(a[i] , b[i]));
        cout << ans << '\n';
        return;
    }

    int l = 1 , r = 1e18+2 , ans = 0;
    while(l <= r)
    {
        int mid = (l+r)/2;
        if(check(mid))
        {
            ans = mid;
            l = mid + 1;
        }
        else r = mid - 1;
    }
    cout << ans << '\n';
}

signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);
    solve();
    return 0;
}

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