#include <bits/stdc++.h>
using namespace std;
#define fileio() freopen("input.txt","r",stdin); freopen("output.txt","w",stdout)
#define fio() ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define all(x) (x).begin(), (x).end()
#define allr(x) x.rbegin(), x.rend()
#define cmprs(x) sort(all(x)),x.erase(unique(all(x)),x.end())
#define endl "\n"
#define sp " "
#define pb push_back
#define lb lower_bound
#define ub upper_bound
#define F first
#define S second
#define rz resize
#define sz(a) (int)(a.size())
#define clr(a) a.clear()
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<int, ll> pil;
typedef tuple<int, int, int> tpi;
typedef tuple<ll, ll, ll> tpl;
typedef pair<double, ll> pdl;
typedef pair<double, int> pdi;
const int dx[] = {1,-1,0,0,1,1,-1,-1};
const int dy[] = {0,0,1,-1,1,-1,1,-1};
const ll MOD = 1e9+7;
const int INF = 0x3f3f3f3f;
const ll LINF = 0x3f3f3f3f3f3f3f3f;
const int MAX = 505; // PLZ CHK!
int N,K;
pair<double,double> A[MAX];
double D[MAX][MAX][MAX];
const double eps=1e-5;
double go(int i, int j, int k) {
if (k==K) return 0.0;
if (i>N) return 1e9;
double &ret=D[i][j][k];
if (ret>-1.0) return ret;
ret=go(i+1,j,k);
ret=min(ret, go(i+1,j,k+1)+A[i].first/(1.0*j));
if (A[i].second>-1.0) ret=min(ret, go(i+1,j+1,k+1)+A[i].second/(1.0*j));
return ret;
}
int main() {
fio();
cin>>N>>K;
for (int i=1; i<=N; i++) {
cin>>A[i].first>>A[i].second;
if (abs(A[i].second+1.0)<eps) A[i].second=1e9;
}
sort(A+1,A+N+1,[](auto a, auto b){
if (abs(a.second-b.second)<eps) return a.first<b.first;
return a.second<b.second;
});
fill_n(&D[0][0][0],MAX*MAX*MAX,-1.0);
cout<<fixed; cout.precision(10);
cout<<go(1,1,0);
return 0;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
451 ms |
1008788 KB |
Output is correct |
2 |
Correct |
462 ms |
1008432 KB |
Output is correct |
3 |
Correct |
464 ms |
1008456 KB |
Output is correct |
4 |
Correct |
470 ms |
1008456 KB |
Output is correct |
5 |
Correct |
490 ms |
1008456 KB |
Output is correct |
6 |
Correct |
557 ms |
1008456 KB |
Output is correct |
7 |
Correct |
694 ms |
1008504 KB |
Output is correct |
8 |
Correct |
856 ms |
1008512 KB |
Output is correct |
9 |
Correct |
960 ms |
1008620 KB |
Output is correct |
10 |
Correct |
936 ms |
1008524 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
451 ms |
1008788 KB |
Output is correct |
2 |
Correct |
462 ms |
1008432 KB |
Output is correct |
3 |
Correct |
464 ms |
1008456 KB |
Output is correct |
4 |
Correct |
470 ms |
1008456 KB |
Output is correct |
5 |
Correct |
490 ms |
1008456 KB |
Output is correct |
6 |
Correct |
557 ms |
1008456 KB |
Output is correct |
7 |
Correct |
694 ms |
1008504 KB |
Output is correct |
8 |
Correct |
856 ms |
1008512 KB |
Output is correct |
9 |
Correct |
960 ms |
1008620 KB |
Output is correct |
10 |
Correct |
936 ms |
1008524 KB |
Output is correct |
11 |
Correct |
478 ms |
1008468 KB |
Output is correct |
12 |
Correct |
570 ms |
1008560 KB |
Output is correct |
13 |
Correct |
555 ms |
1008456 KB |
Output is correct |
14 |
Correct |
565 ms |
1008456 KB |
Output is correct |
15 |
Correct |
918 ms |
1008620 KB |
Output is correct |
16 |
Correct |
871 ms |
1008456 KB |
Output is correct |
17 |
Correct |
864 ms |
1008456 KB |
Output is correct |
18 |
Correct |
969 ms |
1008612 KB |
Output is correct |
19 |
Correct |
1025 ms |
1008456 KB |
Output is correct |
20 |
Correct |
969 ms |
1008452 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
436 ms |
1008372 KB |
Output is correct |
2 |
Correct |
425 ms |
1008352 KB |
Output is correct |
3 |
Correct |
422 ms |
1008396 KB |
Output is correct |
4 |
Correct |
471 ms |
1008452 KB |
Output is correct |
5 |
Correct |
476 ms |
1008456 KB |
Output is correct |
6 |
Correct |
483 ms |
1008456 KB |
Output is correct |
7 |
Correct |
503 ms |
1008508 KB |
Output is correct |
8 |
Correct |
527 ms |
1008504 KB |
Output is correct |
9 |
Incorrect |
538 ms |
1008456 KB |
Output isn't correct |
10 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
436 ms |
1008372 KB |
Output is correct |
2 |
Correct |
425 ms |
1008352 KB |
Output is correct |
3 |
Correct |
422 ms |
1008396 KB |
Output is correct |
4 |
Correct |
471 ms |
1008452 KB |
Output is correct |
5 |
Correct |
476 ms |
1008456 KB |
Output is correct |
6 |
Correct |
483 ms |
1008456 KB |
Output is correct |
7 |
Correct |
503 ms |
1008508 KB |
Output is correct |
8 |
Correct |
527 ms |
1008504 KB |
Output is correct |
9 |
Incorrect |
538 ms |
1008456 KB |
Output isn't correct |
10 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
436 ms |
1008372 KB |
Output is correct |
2 |
Correct |
425 ms |
1008352 KB |
Output is correct |
3 |
Correct |
422 ms |
1008396 KB |
Output is correct |
4 |
Correct |
471 ms |
1008452 KB |
Output is correct |
5 |
Correct |
476 ms |
1008456 KB |
Output is correct |
6 |
Correct |
483 ms |
1008456 KB |
Output is correct |
7 |
Correct |
503 ms |
1008508 KB |
Output is correct |
8 |
Correct |
527 ms |
1008504 KB |
Output is correct |
9 |
Incorrect |
538 ms |
1008456 KB |
Output isn't correct |
10 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
1179 ms |
1008624 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
451 ms |
1008788 KB |
Output is correct |
2 |
Correct |
462 ms |
1008432 KB |
Output is correct |
3 |
Correct |
464 ms |
1008456 KB |
Output is correct |
4 |
Correct |
470 ms |
1008456 KB |
Output is correct |
5 |
Correct |
490 ms |
1008456 KB |
Output is correct |
6 |
Correct |
557 ms |
1008456 KB |
Output is correct |
7 |
Correct |
694 ms |
1008504 KB |
Output is correct |
8 |
Correct |
856 ms |
1008512 KB |
Output is correct |
9 |
Correct |
960 ms |
1008620 KB |
Output is correct |
10 |
Correct |
936 ms |
1008524 KB |
Output is correct |
11 |
Correct |
478 ms |
1008468 KB |
Output is correct |
12 |
Correct |
570 ms |
1008560 KB |
Output is correct |
13 |
Correct |
555 ms |
1008456 KB |
Output is correct |
14 |
Correct |
565 ms |
1008456 KB |
Output is correct |
15 |
Correct |
918 ms |
1008620 KB |
Output is correct |
16 |
Correct |
871 ms |
1008456 KB |
Output is correct |
17 |
Correct |
864 ms |
1008456 KB |
Output is correct |
18 |
Correct |
969 ms |
1008612 KB |
Output is correct |
19 |
Correct |
1025 ms |
1008456 KB |
Output is correct |
20 |
Correct |
969 ms |
1008452 KB |
Output is correct |
21 |
Correct |
436 ms |
1008372 KB |
Output is correct |
22 |
Correct |
425 ms |
1008352 KB |
Output is correct |
23 |
Correct |
422 ms |
1008396 KB |
Output is correct |
24 |
Correct |
471 ms |
1008452 KB |
Output is correct |
25 |
Correct |
476 ms |
1008456 KB |
Output is correct |
26 |
Correct |
483 ms |
1008456 KB |
Output is correct |
27 |
Correct |
503 ms |
1008508 KB |
Output is correct |
28 |
Correct |
527 ms |
1008504 KB |
Output is correct |
29 |
Incorrect |
538 ms |
1008456 KB |
Output isn't correct |
30 |
Halted |
0 ms |
0 KB |
- |