Submission #1200123

#	Time	Username	Problem	Language	Result	Execution time	Memory
1200123		thieunguyenhuy	Safety (NOI18_safety)	C++20	33 / 100	1 ms	328 KiB

safety

#include <bits/stdc++.h>
using namespace std;

#define POPCOUNT(n) (__builtin_popcountll((n)))
#define CLZ(n) (__builtin_clzll((n)))
#define CTZ(n) (__builtin_ctzll((n)))
#define LOG(n) (63 - __builtin_clzll((n)))
#define BIT(n, i) (((n) >> (i)) & 1ll)
#define MASK(i) (1ll << (i))
#define FLIP(n, i) ((n) ^ (1ll << (i)))
#define ON(n, i) ((n) | MASK(i))
#define OFF(n, i) ((n) & ~MASK(i))

#define Int __int128
#define fi first
#define se second

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<long long, long long> pll;
typedef pair<long long, int> pli;
typedef pair<int, long long> pil;
typedef vector<pair<int, int>> vii;
typedef vector<pair<long long, long long>> vll;
typedef vector<pair<long long, int>> vli;
typedef vector<pair<int, long long>> vil;

template <class T1, class T2> bool maximize(T1 &x, T2 y) {
    if (x < y) {
        x = y;
        return true;
    }
    return false;
}
template <class T1, class T2> bool minimize(T1 &x, T2 y) {
    if (x > y) {
        x = y;
        return true;
    }
    return false;
}

template <class T> void remove_duplicate(vector<T> &ve) {
    sort (ve.begin(), ve.end());
    ve.resize(unique(ve.begin(), ve.end()) - ve.begin());
}

mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
template <class T1, class T2> T1 random(T1 l, T2 r) {
    return uniform_int_distribution<T1>(l, r)(rng);
}
template <class T> T random(T r) {
    return rng() % r;
}

const int N = 500 + 5;
const int MOD = 1e9 + 7;
const int inf = 1e9;
const long long INF = 1e18;

int n, h;
int a[N], dp[N][N];

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

    cin >> n >> h;

    for (int i = 1; i <= n; ++i) {
        cin >> a[i];
    }

    priority_queue<ll> leftPoints;
    priority_queue<ll, vector<ll>, greater<ll>> rightPoints;
    ll middle_b = 0; // middle_slope always = 0
    ll shift = h;

    leftPoints.emplace(a[1]);
    rightPoints.emplace(a[1]);
    for (int i = 2; i <= n; ++i) {
        ll l = leftPoints.top() - shift;
        ll r = rightPoints.top() + shift;
        if (l <= a[i] && a[i] <= r) {
            leftPoints.emplace(a[i] + shift);
            rightPoints.emplace(a[i] - shift);
        }
        else if (a[i] < l) {
            leftPoints.emplace(a[i] + shift);
            leftPoints.emplace(a[i] + shift);
            middle_b += abs(l - a[i]);
            rightPoints.emplace(l - shift);
            leftPoints.pop();
        }
        else {
            rightPoints.emplace(a[i] - shift);
            rightPoints.emplace(a[i] - shift);
            middle_b += abs(r - a[i]);
            leftPoints.emplace(r + shift);
            rightPoints.pop();
        }
        shift += h;
    }

    cout << middle_b << '\n';
    return 0;
}

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