Submission #1233228

#	Time	Username	Problem	Language	Result	Execution time	Memory
1233228		12345678	Self Study (JOI22_ho_t2)	C++17	100 / 100	110 ms	5136 KiB

Main

#include <bits/stdc++.h>

using namespace std;

#define ll long long

const int nx=3e5+5;

ll n, m, a[nx], b[nx], l=1, r=1e18;

bool check(ll x)
{
    // return 1 when we can do x
    ll cnt=0;
    for (int i=1; i<=n; i++)
    {
        // calculate minimum classes needed in order to make comprehension level of i'th subject >= x
        // a[i]>=b[i]
        ll cnta=0, cntb=0, curx=x; // amount of classes that we take A
        if (x%a[i]==0) cnta=x/a[i];
        else cnta=x/a[i]+1;
        if (cnta<=m) // purely study in class is enough
        {
            cnt+=cnta;
        }
        else
        {
            curx-=m*a[i];
            if (curx%b[i]==0) cntb=curx/b[i];
            else cntb=curx/b[i]+1;
            cnt+=m+cntb;
        }
        if (cnt>n*m) return 0;
    }
    return 1;
}

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n>>m;
    for (int i=1; i<=n; i++) cin>>a[i];
    for (int i=1; i<=n; i++) cin>>b[i], a[i]=max(a[i], b[i]);
    while (l<r)
    {
        ll md=(l+r+1)/2;
        if (check(md)) l=md;
        else r=md-1;
    }
    cout<<l;
}

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