#include <bits/stdc++.h>
using namespace std;
const int N = 505;
array<double, 2> dpold[N][N], dpnew[N][N];
signed main(){
ios_base::sync_with_stdio(false);
cin.tie(0);
int n, k; cin >> n >> k;
vector<array<int, 2>> a(n);
for(auto &[i, l]: a) cin >> i >> l;
sort(a.begin(), a.end(), [&](auto x, auto y){
if(x[1]==y[1]) return x[0] < y[0];
else if(y[1]==-1) return true;
else if(x[1]==-1) return false;
return x[1]<y[1];
});
// for(auto [i, l]: a) cout<<i<<" "<<l<<"\n";
for(int i=0; i<=n+1; i++){
for(int l=0; l<=n+1; l++){
dpold[i][l]={1e9, 1e9};
}
}
dpold[0][0]={0, 0};
for(int i=0; i<=n; i++){
for(int i=0; i<=n+1; i++){
for(int l=0; l<=n+1; l++){
dpnew[i][l]={1e9, 1e9};
}
}
for(int l=n; l>=0; l--){
for(int x=n-1; x>=0; x--){
// cout<<(double)a[i][1]/(double)(l+1)<<"\n";
if(a[i][1]!=-1)
dpnew[l+1][x]=min(dpnew[l+1][x], {dpold[l][x][0]+(double)a[i][1]/(double)(l+1), dpold[l][x][1]});
dpnew[l][x+1]=min(dpnew[l][x+1], {dpold[l][x][0], dpold[l][x][1]+(double)a[i][0]});
}
}
for(int j=0; j<=n+1; j++){
for(int l=0; l<=n+1; l++){
dpold[j][l]=min(dpold[j][l], dpnew[j][l]);
}
}
}
double ans=1e9;
for(int i=0; i<=k; i++){
ans=min(ans, dpold[i][k-i][0]+(double)dpold[i][k-i][1]/(double)(i+1));
}
cout<<setprecision(9)<<fixed<<ans<<"\n";
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
1 ms |
2396 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
1 ms |
2396 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
1 ms |
2396 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
1 ms |
2396 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
1 ms |
2396 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
1100 ms |
8400 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
1 ms |
2396 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |