Submission #923792

#	Time	Username	Problem	Language	Result	Execution time	Memory
923792		OAleksa	Let's Win the Election (JOI22_ho_t3)	C++14	10 / 100	427 ms	5208 KiB

Main

#include <bits/stdc++.h>
using namespace std;
#define f first
#define s second
#define int long long
const int N = 550;
const int inf = 1e18;
int n, x;
pair<int, int> a[N];
double dp1[N][N], dp2[N][N];
signed main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  int tt = 1;
  //cin >> tt;
  while (tt--) {
  	cin >> n >> x;
  	for (int i = 1;i <= n;i++) {
  		cin >> a[i].f >> a[i].s;
  		if (a[i].s == -1)
  			a[i].s = inf;
  	}
  	sort(a + 1, a + n + 1, [&](pair<int, int> x, pair<int, int> y) {
  		if (x.s == y.s)
  			return x.f > y.f;
  		return x.s < y.s;
  	});
  	for (int i = 0;i <= n;i++) {
  		for (int j = 0;j <= n;j++) {
  			dp1[i][j] = inf;
  		}
  	}
		dp1[0][1] = 0;
  	//prvih i, dobio sam j glasova, k ljudi je samnom
  	for (int i = 1;i <= n;i++) {
  		for (int j = 1;j <= n;j++) {
  			for (int k = 1;k <= n;k++) {
  				dp2[j][k] = dp1[j][k];
  				dp2[j][k] = min(dp2[j][k], dp1[j - 1][k] + (double)a[i].f / k);
  				dp2[j][k] = min(dp2[j][k], dp1[j - 1][k - 1] + (double)a[i].s / (k - 1));
  			}
  		}
  		for (int j = 1;j <= n;j++) {
  			for (int k = 1;k <= n;k++)
  				dp1[j][k] = dp2[j][k];
  		}
  	}
  	double ans = inf;
  	for (int i = 1;i <= n;i++)
  		ans = min(ans, dp1[x][i]);
  	cout << fixed << setprecision(15) << ans;
  }
  return 0;
}

• 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