Submission #1263910

#	Time	Username	Problem	Language	Result	Execution time	Memory
1263910		goulthen	Let's Win the Election (JOI22_ho_t3)	C++20	0 / 100	2591 ms	324 KiB

Main

#include <bits/stdc++.h>
using namespace std;

#define int long long
#define rep(i,a,b) for (int i = a; i <= b; ++i)
#define pii pair<int,int>
#define fi first
#define se second
#define pb push_back
#define all(v) (v).begin(), (v).end()

const int MAXN = 510;
pii a[MAXN];
bool mk[MAXN];

int32_t main() {
	ios_base::sync_with_stdio(0); cin.tie(nullptr);

	int n,k; cin >> n >> k;
	rep(i,1,n) cin >> a[i].fi >> a[i].se;
	double ans = 1e9;
	rep(mask,1,(1<<n)-1) {
		double cur = 0;
		vector<int> b,c;
		rep(i,1,n) {
			if (mask&(1<<(i-1))) b.pb(a[i].se);
			else c.pb(a[i].fi);
		}

		if (b.size() > k) continue;
		sort(all(b));
		sort(all(c));
		int cnt = 1;
		for (int &v : b) {
			cur += (double)v/cnt;
			cnt++;
		}

		rep(i,0,k-(int)b.size()-1) {
			cur+=(double)c[i]/cnt;
		}

		ans = min(ans, cur);
	}
	cout << fixed << setprecision(15) << ans << '\n';
}

• 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