// Success consists of going from failure to failure without loss of enthusiasm
#include <bits/stdc++.h>
using namespace std;
#define nl '\n'
template<class T> using V = vector<T>;
const double eps = 1e-7;
int main() {
cin.tie(0)->sync_with_stdio(0);
cout << fixed << setprecision(15);
int N, K; cin >> N >> K;
V<int> A(N), B(N);
for(int i = 0; i < N; i++) {
cin >> A[i] >> B[i];
}
double ans = double(1e6);
V<int> BI;
set<int> use; for(int i = 0; i < N; i++) use.insert(i);
for(int c = 0; c <= N; c++) {
V<int> AI; for(auto& x : use) AI.push_back(x);
sort(begin(AI), end(AI), [&](int i, int j) {
return A[i] < A[j];
});
V<int> ord;
double res = 0;
for(int i = 0; i < c; i++) {
// cout << BI[i] << " " << B[BI[i]] << endl;
res += double(B[BI[i]]) / double(i + 1);
}
for(int i = 0; i < K - c; i++) {
// cout << AI[i] << " " << A[AI[i]] << endl;
res += double(A[AI[i]]) / double(c + 1);
}
// cout << c << " " << res << endl;
if (res+eps < ans) ans = res;
V<int> I; for(auto& x : use) if (B[x] != -1) I.push_back(x);
sort(begin(I), end(I), [&](int i, int j) {
int db = B[i] - B[j];
int da = A[i] - A[j];
// cout << i << " " << j << endl;
// cout << A[i] << " " << B[i] << endl;
// cout << A[j] << " " << B[j] << endl;
// cout << db << " " << da << endl;
// cout << int((db * (c + 2)) > (da * (c + 1))) << endl;
// cout << endl;
int L = (db * (c + 2));
int R = (da * (c + 1));
if (L == R) return (A[i] == A[j] ? B[i] > B[j] : A[i] > A[j]);
return L < R;
});
if (size(I) == 0) break;
int best = I.front();
BI.push_back(best);
use.erase(best);
// cout << A[best] << " " << B[best] << endl;
// cout << best << endl << endl;
}
cout << ans << nl;
return 0;
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
212 KB |
Output is correct |
| 2 |
Correct |
1 ms |
320 KB |
Output is correct |
| 3 |
Correct |
1 ms |
316 KB |
Output is correct |
| 4 |
Correct |
1 ms |
212 KB |
Output is correct |
| 5 |
Correct |
1 ms |
340 KB |
Output is correct |
| 6 |
Correct |
1 ms |
340 KB |
Output is correct |
| 7 |
Correct |
1 ms |
340 KB |
Output is correct |
| 8 |
Correct |
1 ms |
340 KB |
Output is correct |
| 9 |
Correct |
1 ms |
340 KB |
Output is correct |
| 10 |
Correct |
1 ms |
340 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
212 KB |
Output is correct |
| 2 |
Correct |
1 ms |
320 KB |
Output is correct |
| 3 |
Correct |
1 ms |
316 KB |
Output is correct |
| 4 |
Correct |
1 ms |
212 KB |
Output is correct |
| 5 |
Correct |
1 ms |
340 KB |
Output is correct |
| 6 |
Correct |
1 ms |
340 KB |
Output is correct |
| 7 |
Correct |
1 ms |
340 KB |
Output is correct |
| 8 |
Correct |
1 ms |
340 KB |
Output is correct |
| 9 |
Correct |
1 ms |
340 KB |
Output is correct |
| 10 |
Correct |
1 ms |
340 KB |
Output is correct |
| 11 |
Correct |
1 ms |
212 KB |
Output is correct |
| 12 |
Correct |
13 ms |
340 KB |
Output is correct |
| 13 |
Correct |
8 ms |
356 KB |
Output is correct |
| 14 |
Correct |
3 ms |
340 KB |
Output is correct |
| 15 |
Correct |
13 ms |
340 KB |
Output is correct |
| 16 |
Correct |
8 ms |
340 KB |
Output is correct |
| 17 |
Correct |
3 ms |
340 KB |
Output is correct |
| 18 |
Correct |
14 ms |
340 KB |
Output is correct |
| 19 |
Correct |
8 ms |
340 KB |
Output is correct |
| 20 |
Correct |
3 ms |
340 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
324 KB |
Output is correct |
| 2 |
Correct |
1 ms |
324 KB |
Output is correct |
| 3 |
Correct |
1 ms |
320 KB |
Output is correct |
| 4 |
Correct |
1 ms |
212 KB |
Output is correct |
| 5 |
Correct |
1 ms |
212 KB |
Output is correct |
| 6 |
Correct |
1 ms |
212 KB |
Output is correct |
| 7 |
Correct |
1 ms |
212 KB |
Output is correct |
| 8 |
Correct |
1 ms |
212 KB |
Output is correct |
| 9 |
Correct |
1 ms |
320 KB |
Output is correct |
| 10 |
Correct |
1 ms |
212 KB |
Output is correct |
| 11 |
Incorrect |
1 ms |
212 KB |
Output isn't correct |
| 12 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
324 KB |
Output is correct |
| 2 |
Correct |
1 ms |
324 KB |
Output is correct |
| 3 |
Correct |
1 ms |
320 KB |
Output is correct |
| 4 |
Correct |
1 ms |
212 KB |
Output is correct |
| 5 |
Correct |
1 ms |
212 KB |
Output is correct |
| 6 |
Correct |
1 ms |
212 KB |
Output is correct |
| 7 |
Correct |
1 ms |
212 KB |
Output is correct |
| 8 |
Correct |
1 ms |
212 KB |
Output is correct |
| 9 |
Correct |
1 ms |
320 KB |
Output is correct |
| 10 |
Correct |
1 ms |
212 KB |
Output is correct |
| 11 |
Incorrect |
1 ms |
212 KB |
Output isn't correct |
| 12 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
324 KB |
Output is correct |
| 2 |
Correct |
1 ms |
324 KB |
Output is correct |
| 3 |
Correct |
1 ms |
320 KB |
Output is correct |
| 4 |
Correct |
1 ms |
212 KB |
Output is correct |
| 5 |
Correct |
1 ms |
212 KB |
Output is correct |
| 6 |
Correct |
1 ms |
212 KB |
Output is correct |
| 7 |
Correct |
1 ms |
212 KB |
Output is correct |
| 8 |
Correct |
1 ms |
212 KB |
Output is correct |
| 9 |
Correct |
1 ms |
320 KB |
Output is correct |
| 10 |
Correct |
1 ms |
212 KB |
Output is correct |
| 11 |
Incorrect |
1 ms |
212 KB |
Output isn't correct |
| 12 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
13 ms |
340 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
212 KB |
Output is correct |
| 2 |
Correct |
1 ms |
320 KB |
Output is correct |
| 3 |
Correct |
1 ms |
316 KB |
Output is correct |
| 4 |
Correct |
1 ms |
212 KB |
Output is correct |
| 5 |
Correct |
1 ms |
340 KB |
Output is correct |
| 6 |
Correct |
1 ms |
340 KB |
Output is correct |
| 7 |
Correct |
1 ms |
340 KB |
Output is correct |
| 8 |
Correct |
1 ms |
340 KB |
Output is correct |
| 9 |
Correct |
1 ms |
340 KB |
Output is correct |
| 10 |
Correct |
1 ms |
340 KB |
Output is correct |
| 11 |
Correct |
1 ms |
212 KB |
Output is correct |
| 12 |
Correct |
13 ms |
340 KB |
Output is correct |
| 13 |
Correct |
8 ms |
356 KB |
Output is correct |
| 14 |
Correct |
3 ms |
340 KB |
Output is correct |
| 15 |
Correct |
13 ms |
340 KB |
Output is correct |
| 16 |
Correct |
8 ms |
340 KB |
Output is correct |
| 17 |
Correct |
3 ms |
340 KB |
Output is correct |
| 18 |
Correct |
14 ms |
340 KB |
Output is correct |
| 19 |
Correct |
8 ms |
340 KB |
Output is correct |
| 20 |
Correct |
3 ms |
340 KB |
Output is correct |
| 21 |
Correct |
1 ms |
324 KB |
Output is correct |
| 22 |
Correct |
1 ms |
324 KB |
Output is correct |
| 23 |
Correct |
1 ms |
320 KB |
Output is correct |
| 24 |
Correct |
1 ms |
212 KB |
Output is correct |
| 25 |
Correct |
1 ms |
212 KB |
Output is correct |
| 26 |
Correct |
1 ms |
212 KB |
Output is correct |
| 27 |
Correct |
1 ms |
212 KB |
Output is correct |
| 28 |
Correct |
1 ms |
212 KB |
Output is correct |
| 29 |
Correct |
1 ms |
320 KB |
Output is correct |
| 30 |
Correct |
1 ms |
212 KB |
Output is correct |
| 31 |
Incorrect |
1 ms |
212 KB |
Output isn't correct |
| 32 |
Halted |
0 ms |
0 KB |
- |
