Submission #1265130

#	Time	Username	Problem	Language	Result	Execution time	Memory
1265130		tvgk	Let's Win the Election (JOI22_ho_t3)	C++20	100 / 100	171 ms	464 KiB

Main

#include<bits/stdc++.h>
using namespace std;
#define task "a"
#define se second
#define fi first
#define ll long long
#define ii pair<ll, ll>
const long mxN = 2e5 + 7, inf = 1e9 + 7;

int n, k;
double dp[mxN];
ii a[mxN];

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    //freopen(task".INP", "r", stdin);
    //freopen(task".OUT", "w", stdout);

    cin >> n >> k;
    for (int i = 1; i <= n; i++)
    {
        cin >> a[i].se >> a[i].fi;
        if (a[i].fi == -1)
            a[i].fi = inf;
    }
    sort(a + 1, a + n + 1);

    double ans = inf;
    for (int i = 0; i <= k; i++)
    {
        for (int j = 0; j <= k; j++)
            dp[j] = inf;

        dp[0] = 0;
        for (int j = 1; j <= n; j++)
        {
            for (int u = k; u >= 0; u--)
            {
                dp[u + 1] = min(dp[u + 1], dp[u] + double(a[j].se) / (i + 1));

                int v = j - u;
                if (0 < v && v <= i)
                {
                    if (a[i].fi == inf)
                        dp[u] = inf;
                    else
                        dp[u] += double(a[j].fi) / v;
                }
            }
        }
        
        ans = min(ans, dp[k - i]);
    }
    cout << fixed << setprecision(9) << ans;
}

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