Submission #1253528

#	Time	Username	Problem	Language	Result	Execution time	Memory
1253528		norman165	Let's Win the Election (JOI22_ho_t3)	C++20	0 / 100	460 ms	1114112 KiB

Main

#include <bits/stdc++.h>

#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define int long long
#define yes() cout << "YES\n"
#define no() cout << "NO\n"

using namespace std;
using ll = long long;
using ull = unsigned long long;
using ld = long double;

const int inf = 1e9;
const int mod = 1e9 + 7;
const int maxn = 1e6 + 10;
const int mod1 = 998244353;
const int mod2 = 1e18 + 1;
const int mod3 = 1e9 + 9;
const int mod4 = 333333333;
const int mod5 = 200000;
const int mod6 = 10007;
const int k = 300;
const int w = 1e5;
const ld EPS = 1e-8;

int LOG = 30;

void solve() {
    int n, k1;
    cin >> n >> k1;

    vector<pair<ld, ld>> a(n);
    for (auto& i : a) {
        cin >> i.first >> i.second;
        if (i.second == -1) i.second = inf;
    }

    sort(all(a), [](pair<ld, ld> a, pair<ld, ld> b) {
        return a.second < b.second || (a.second == b.second && a.first > b.first);
    });

    ld ans = inf;
    vector<vector<vector<ld>>> dp(n, vector<vector<ld>> (n + 1, vector<ld> (n + 1, inf)));
    for (int i = 0; i < n; i++) {
        dp[i][0][0] = 0;
        dp[i][1][1] = a[i].second;
        dp[i][0][1] = a[i].first;
    }

    for (int i = 0; i < n; i++) {
        for (int j = 0; j <= n; j++) {
            for (int k = 1; k <= n; k++) {
                for (int i1 = 0; i1 < i; i1++) {
                    ld cnt = j;
                    if (j != 0) dp[i][j][k] = min({dp[i][j][k], dp[i1][j - 1][k - 1] + a[i].second / cnt, dp[i1][j][k - 1] + a[i].first / (cnt + 1)});
                    else dp[i][j][k] = min(dp[i][j][k], dp[i1][j][k - 1] + a[i].first);
                }
            }
        }
    }

    for (int i = 0; i < n; i++) {
        for (int j = 0; j <= n; j++) {
            for (int k = 0; k <= n; k++) {
                if (k >= k1) ans = min(ans, dp[i][j][k]);
            }
        }
    }

    cout << ans << "\n";
}

signed main() {
    cout.precision(16);

    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int t = 1;
    // cin >> t;

    while (t--) {
        solve();
    }
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 5
• Subtask 3: 0 / 11
• Subtask 4: 0 / 12
• Subtask 5: 0 / 33
• Subtask 6: 0 / 11
• Subtask 7: 0 / 23