Submission #535713

#	Time	Username	Problem	Language	Result	Execution time	Memory
535713		sam571128	Collecting Stamps 3 (JOI20_ho_t3)	C++17	0 / 100	16 ms	8404 KiB

ho_t3

#include <bits/stdc++.h>

#define int long long
#define fastio ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

using namespace std;

const int N = 16;
int dp[1<<N][N][N], x[N], t[N], ans = 0;
//mask, at, taken, dp[i][j][k] => time

signed main(){
    fastio
    int n,l;
    cin >> n >> l;

    for(int i = 0;i < n;i++){
        cin >> x[i];
    }

    for(int i = 0;i < n;i++){
        cin >> t[i];
    }

    for(int mask = 0;mask < (1<<n);mask++){
        for(int i = 0;i < n;i++){
            for(int j = 0;j <= n;j++){
                dp[mask][i][j] = 1e18;
            }
        }
    }

    for(int i = 0;i < n;i++){
        int tmp = min(x[i],(0-x[i]+l)%l);
        int take = (tmp <= t[i]);
        dp[(1<<i)][i][take] = tmp;
    }

    for(int mask = 0; mask < (1<<n); mask++){
        for(int i = 0;i < n;i++){
            if(mask&(1<<i)){
                for(int j = 0;j < n;j++){
                    if(!(mask&(1<<j))){
                        for(int take = 0;take < n;take++){
                            if(dp[mask][i][take]>=1e18) continue;
                            int tmp = min((x[j]-x[i]+l)%l,(x[i]-x[j]+l)%l);
                            int tt = dp[mask][i][take]+tmp;
                            dp[mask^(1<<j)][j][take+(tt<=t[j])] = tt;
                        }
                    }
                }
            }
        }
    }

    int ans = 0;

    for(int mask = 0;mask < (1<<n);mask++){
        for(int i = 0;i < n;i++){
            for(int j = 0;j <= n;j++){
                if(dp[mask][i][j]<1e18){
                    ans = max(ans,j);
                }
            }
        }
    }


    cout << ans << "\n";
}

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