Submission #221877

#	Time	Username	Problem	Language	Result	Execution time	Memory
221877		davooddkareshki	Collecting Stamps 3 (JOI20_ho_t3)	C++17	0 / 100	5 ms	384 KiB

ho_t3

#include<bits/stdc++.h>

using namespace std;

typedef long long ll;

#define F first
#define S second
#define int long long

const int maxn = 1e6+10;
const ll inf = 1e18+10;

int n, L;
int x[maxn], t[maxn];

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

    cin>> n >> L;
    for(int i = 1; i <= n; i++) cin>> x[i];
    for(int i = 1; i <= n; i++) cin>> t[i];

    ll ans = 0;
    for(int l = 0; l <= n; l++)
        for(int R = l+1; R <= n+1; R++)
        {
            int r = R;

            int A = 0, tim = 0;
            for(int i = 1; i <= l; i++)
                if(tim + x[i] <= t[i])
                    A++;

            ans = max(ans,A);
            tim = 2*x[l];
            for(int i = n; i >= r; i--)
                if(tim + (L-x[i]) <= t[i])
                    A++;

            ans = max(ans,A);

           // cout<< l <<" "<< r <<" "<< A <<"\n";

            tim = 0, A = 0;
            for(int i = n; i >= r; i--)
                if(tim + (L-x[i]) <= t[i])
                    A++;

            ans = max(ans,A);
            tim = 2*(L-x[r]);
            if(r == n+1) tim = 0;
            for(int i = 1; i <= l; i++)
                if(tim + x[i] <= t[i])
                    A++;

            ans = max(ans,A);

           // cout<< l <<" "<< r <<" "<< A <<"\n";
        }
    cout<< ans;
}

/*
6 25
3 4 7 17 21 23
11 7 17 10 8 10

10 87
9 23 33 38 42 44 45 62 67 78
15 91 7 27 31 53 12 91 89 46

4 19
3 7 12 14
2 0 5 4

5 20
4 5 8 13 17
18 23 15 7 10
*/

• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 75