Submission #961656

#	Time	Username	Problem	Language	Result	Execution time	Memory
961656		vjudge1	Safety (NOI18_safety)	C++17	40 / 100	216 ms	201608 KiB

safety

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
#define ent "\n"

const int maxn = 5e3 + 100;
const ll INF = (ll)1e18 + 100;
const int inf = 1e9 + 100;
const int MOD = 1e9 + 7;
const int maxl = 14;

int n, h;
int a[200010];
ll dp[maxn][maxn];

void test(){
    cin >> n >> h;
    int mx = 0;
    for(int i = 1; i <= n ;i++){
        cin >> a[i];
        mx = max(mx, a[i]);
    }
    if(max(mx, n) <= 5000){
        for(int x = 0; x <= 5000; x++){
            dp[1][x] = abs(x - a[1]);
        }
        for(int i = 2; i <= n; i++){
            deque<ll> d;
            for(int x = 0, l = 0, r = -1; x <= 5000; x++){
                while(abs(r - x + 1) <= h && r < 5000){
                    r++;
                    while(d.size() && d.back() > dp[i-1][r]){
                        d.pop_back();
                    }
                    d.push_back(dp[i-1][r]);
                }
                while(abs(l - x) > h){
                    if(d.front() == dp[i-1][l]){
                        d.pop_front();
                    }
                    l++;
                }
                dp[i][x] = d.front() + abs(x - a[i]);
            }
        }
        sort(dp[n], dp[n] + 5000 + 1);
        cout << dp[n][0];
    } else if(!h){
        sort(a + 1, a + n + 1);
        ll x = 0, y = 0;
        for(int i = 1; i <= n; i++){
            y += a[i];
        }
        ll ans = INF;
        for(int i = 1; i <= n; i++){
            x += a[i];
            ans = min(ans, 1ll * a[i] * i - x + y - x - 1ll * a[i] * (n - i));
        }
        cout << ans;
    }
}

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    int t; t = 1;
    while(t--) test();
    cout << ent;
}

• Subtask 1: 3 / 3
• Subtask 2: 4 / 4
• Subtask 3: 0 / 9
• Subtask 4: 5 / 5
• Subtask 5: 6 / 6
• Subtask 6: 11 / 11
• Subtask 7: 11 / 11
• Subtask 8: 0 / 22
• Subtask 9: 0 / 29