Submission #721672

#	Time	Username	Problem	Language	Result	Execution time	Memory
721672		The_Samurai	Uplifting Excursion (BOI22_vault)	C++17	0 / 100	3 ms	4308 KiB

vault

#pragma GCC optimize("Ofast")
#pragma GCC target("avx,avx2")
#include "bits/stdc++.h"

using namespace std;
using ll = long long;
int INF = 1e9;

void solve() {
    int n, zero = 0;
    ll l;
    cin >> n >> l;
    vector<ll> a(n + 1), b(n + 1);
    for (int i = 0; i < n; i++)
        cin >> b[n - i];
    cin >> zero;
    for (int i = 1; i <= n; i++)
        cin >> a[i];
    if (l < 0) {
        swap(a, b);
        l = -l;
    }
    if (*max_element(a.begin(), a.end()) <= 100) {
        int N = 5e5 + 1e4, ans = 0;
        vector<int> dp_plus(N, -INF), dp_minus(N, -INF);
        dp_plus[0] = dp_minus[0] = 0;
        if (l > N) {
            cout << "impossible";
            return;
        }
        int sum1 = 0, sum2 = 0;
        for (int i = 1; i <= n; i++) {
            sum1 += a[i] * i;
            sum2 += b[i] * i;
            for (int j = sum1; j >= i; j--) {
                for (int k = 1; k <= a[i] and i * k <= j; k++) {
                    if (dp_plus[j - i * k] >= 0) {
                        dp_plus[j] = max(dp_plus[j], dp_plus[j - i * k] + k);
                        break;
                    }
                }
            }
            for (int j = sum2; j >= i; j--) {
                for (int k = 1; k <= b[i] and i * k <= j; k++) {
                    if (dp_minus[j - i * k] >= 0) {
                        dp_minus[j] = max(dp_minus[j], dp_minus[j - i * k] + k);
                        break;
                    }
                }
            }
        }
        if (sum1 >= l) {
            ans = max(ans, dp_plus[sum1] + dp_minus[sum1 - l]);
        }
        if (ans == 0) cout << "impossible";
        else cout << ans + zero;
        return;
    }

}

int main() {
    ios_base::sync_with_stdio(false); cout.tie(nullptr); cin.tie(nullptr);

    int queries = 1;
#ifdef test_cases
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
//    cin >> queries;
#else
//    cin >> queries;
#endif

    for (int test_case = 1; test_case <= queries; test_case++) {
        solve();
//        cout << '\n';
    }
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 15
• Subtask 3-1: 0 / 10
• Subtask 3-2: 0 / 10
• Subtask 4-1: 0 / 10
• Subtask 4-2: 0 / 10
• Subtask 5-1: 0 / 10
• Subtask 5-2: 0 / 10
• Subtask 6-1: 0 / 10
• Subtask 6-2: 0 / 10