Submission #1264012

#	Time	Username	Problem	Language	Result	Execution time	Memory
1264012		goulthen	Let's Win the Election (JOI22_ho_t3)	C++20	10 / 100	66 ms	2376 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];
double dp[MAXN][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].se >> a[i].fi;
		if (a[i].fi == -1) a[i].fi = 1e9;
	}
	sort(a+1, a+n+1);
	double ans = 1e9;
	rep(cc,0,k) {
		if (a[cc].fi == 1e9) break;
		rep(j,1,n) dp[0][j] = 1e9;
		rep(i,1,cc) {
			dp[i][0] = dp[i-1][0] + (double)a[i].fi/i;
			rep(j,1,n) dp[i][j] = dp[i-1][j];
		}

		rep(i,cc+1,n) {
			rep(j,0,n) {
				dp[i][j] = dp[i-1][j];
				if (j>0) dp[i][j] = min(dp[i][j], dp[i-1][j-1] + (double)a[i].se/(cc+1));
				//cout << i << ' ' << j << ' ' << dp[i][j] << '\n';
			}
		}

		ans = min(ans, dp[n][k-cc]);
	}
	
	cout << fixed << setprecision(15) << ans << '\n';
}

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