Submission #572605

#	Time	Username	Problem	Language	Result	Execution time	Memory
572605		JovanB	Let's Win the Election (JOI22_ho_t3)	C++17	100 / 100	527 ms	6348 KiB

Main

#include <bits/stdc++.h>
using namespace std;

using ll = long long;
using ld = long double;

const int N = 500;

ll dpm[N+5][N+5];
ld dp[N+5][N+5];
pair <int, int> a[N+5];

int main(){
    ios_base::sync_with_stdio(false), cin.tie(0);
    cout.precision(10);
    cout << fixed;

    int n, k;
    cin >> n >> k;
    for(int i=1; i<=n; i++){
        cin >> a[i].first >> a[i].second;
        if(a[i].second == -1) a[i].second = 1005;
    }
    sort(a+1, a+1+n, [](pair <int, int> x, pair <int, int> y){ if(x.second == y.second) return x.first < y.first; return x.second < y.second; });
    for(int j=1; j<=n; j++) dpm[n+1][j] = 1e18;
    for(int i=n; i>=1; i--){
        for(int j=1; j<=n; j++){
            dpm[i][j] = dpm[i+1][j];
            dpm[i][j] = min(dpm[i][j], dpm[i+1][j-1] + a[i].first);
        }
    }
    ld res = 1e18;
    for(int t=0; t<=k; t++){
        for(int j=1; j<=t; j++) dp[0][j] = 1e18;
        for(int i=1; i<=n; i++){
            for(int j=0; j<=t; j++){
                dp[i][j] = dp[i-1][j] + 1.0*a[i].first/(t + 1);
                if(a[i].second != 1005 && j) dp[i][j] = min(dp[i][j], dp[i-1][j-1] + 1.0*a[i].second/j);
            }
        }
        for(int i=0; i<=n; i++){
            if(i >= t && k >= i) res = min(res, dp[i][t] + 1.0*dpm[i+1][k-i]/(t + 1));
        }
    }
    cout << res << "\n";
    return 0;
}

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 11 / 11
• Subtask 4: 12 / 12
• Subtask 5: 33 / 33
• Subtask 6: 11 / 11
• Subtask 7: 23 / 23