Submission #1231375

#	Time	Username	Problem	Language	Result	Execution time	Memory
1231375		omsincoconut	Uplifting Excursion (BOI22_vault)	C++17	0 / 100	1 ms	580 KiB

vault

#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

const ll INF = 1e18, BOUND = 2e4+10;

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

    ll M, L;
    cin >> M >> L;

    if (L+BOUND/2 < 0 || L+BOUND/2 >= BOUND) {
        cout << "impossible";
        return 0;
    }

    ll A[2*M+1];
    for (ll i = 0; i <= 2*M; i++) cin >> A[i];

    ll knap[BOUND];
    fill(knap, knap+BOUND, -INF);
    knap[BOUND/2] = A[0];

    // subtract
    for (ll i = 1; i <= M; i++) {
        for (ll j = 1; j <= A[M-i]; j++) {
            for (ll k = 0; k < BOUND-i; k++) {
                knap[k] = max(knap[k], knap[k+i]+1);
            }
        }
    }

    // add
    for (ll i = 1; i <= M; i++) {
        for (ll j = 1; j <= A[M+i]; j++) {
            for (ll k = BOUND-1; k >= i; k--) {
                knap[k] = max(knap[k], knap[k-i]+1);
            }
        }
    }

    ll val = knap[L+BOUND/2];
    if (val < 0) cout << "impossible";
    else cout << val;

    return 0;
}

/*
2 5
2 3 1 1 4
*/

/*
3 5
3 1 0 2 0 0 2
*/

/*
1 5
0 0 6
*/

• 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