제출 #1026636

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1026636		gyg	Uplifting Excursion (BOI22_vault)	C++17	0 / 100	49 ms	604 KiB

vault

#include <bits/stdc++.h>    
using namespace std;
#define int long long
const int OFFSET = 1e4, INF = 1e9;

int n, tar;
unordered_map<int, int> t;

array<int, 2 * OFFSET + 5> dp;
void comp() {
    fill(dp.begin(), dp.end(), -INF);
    dp[OFFSET] = 0;
    for (int x = -n; x <= n; x++) {
        for (int i = 1; i <= t[x]; i++) {
            array<int, 2 * OFFSET + 5> old_dp = dp;
            for (int y = OFFSET; y >= -OFFSET; y--)
                if (-OFFSET <= y - x && y - x <= OFFSET) dp[y + OFFSET] = max(old_dp[y + OFFSET], old_dp[y - x + OFFSET] + 1);
        }
    }
}

signed main() {
    // freopen("vault.in", "r", stdin);
    cin >> n >> tar;
    if (tar < -OFFSET || tar > OFFSET) { cout << "impossible" << '\n'; exit(0); }
    for (int i = -n; i <= n; i++) cin >> t[i];

    comp();

    cout << ((dp[tar + OFFSET] < 0) ? "impossible" : to_string(dp[tar + OFFSET])) << '\n';
    
}

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