Submission #599195

#	Time	Username	Problem	Language	Result	Execution time	Memory
599195		SlavicG	Uplifting Excursion (BOI22_vault)	C++17	0 / 100	558 ms	524288 KiB

vault

#include "bits/stdc++.h"
using namespace std;
using ll = long long;

vector<int> calc(vector<int> x) {
    int S = (int)x.size() * 100;
    vector<int> dp(S + 1, INT_MIN);
    dp[0] = 0;
    for(int i = 0; i < (int)x.size(); ++i) {
        for(int j = S; j >= 0; --j) {
            if(j - x[i] >= 0) if(dp[j - x[i]] != INT_MIN) dp[j] = max(dp[j], dp[j - x[i]] + 1);
        }
    }
    return dp;
}
int main() {
    ll l, m; cin >> m >> l;
    vector<int> a(2 * m + 1);
    for(int i = 0; i < 2 * m + 1; ++i) cin >> a[i];

    int ans = INT_MIN;
    vector<int> neg;
    int val = m;
    for(int i = 0; i < m; ++i) {
        for(int j = 0; j < a[i]; ++j) neg.push_back(val);
        --val;
    }
    vector<int> pos;
    val = 1;
    for(int i = m + 1; i < 2 * m + 1; ++i) {
        for(int j = 0; j < a[i]; ++j) pos.push_back(val);
        ++val;
    }
    vector<int> pp = calc(pos);
    vector<int> ng = calc(neg);

    if(l < 0) {
        swap(pp, ng);
        l = -l;
    }
    for(int sum = l; sum < (int)pp.size(); ++sum) {
        if(sum - l >= (int)ng.size() || pp[sum] == INT_MIN || ng[sum - l] == INT_MIN) continue;
        ans = max(ans, pp[sum] + ng[sum - l] + a[m]);
    }
    if(ans == INT_MIN) cout << "impossible\n";
    else cout << ans << "\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