| # | Time | Username | Problem | Language | Result | Execution time | Memory |
|---|---|---|---|---|---|---|---|
| 824414 | peteza | Let's Win the Election (JOI22_ho_t3) | C++14 | 0 ms | 0 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
int n, k;
bool vis[505][505][505];
long double DP[505][505][505], inf = 1e12, cans = inf;
pair<int, int> dat[505];
long double calc(int i, int j, int k) {
if(vis[i][j][k]) return DP[i][j][k];
vis[i][j][k] = 1;
if(i == 0 || j<k) return DP[i][j][k] = inf;
DP[i][j][k] = calc(i-1, j, k);
if(j) DP[i][j][k] = min(DP[i][j][k], calc(i-1, j-1, k) + (1.00*dat[i-1].first/(k+1)));
if(j && k && dat[i-1].second != INT_MAX) DP[i][j][k] = min(DP[i][j][k], calc(i-1, j-1, k-1) + (1.00*dat[i-1].second/k));
return DP[i][j][k];
}
int main() {
DP[0][0][0] = 0; vis[0][0][0] = 1;
cin >> n >> k;
int bc = n;
for(int i=0;i<n;i++) {
cin >> dat[i].first >> dat[i].second;
if(dat[i].second == -1) bc--, dat[i].second = INT_MAX;
}
sort(dat, dat+n, [](pair<int, int> a, pair<int, int> b){
if(a.second == b.second) return a.first < b.first;
return a.second < b.second;
});
/*for(int i=0;i<=n;i++) {
for(int j=0;j<=n;j++) {
for(int k=0;k<=n;k++) {
cout << calc(i, j, k) << ' ';
}
cout << '\n';
}
cout << "---\n";
}*/
for(int i=0;i<=bc;i++) cans = min(cans, calc(n, k, i));
cout << cans;
}