Submission #863841

#	Time	Username	Problem	Language	Result	Execution time	Memory
863841		prairie2022	Let's Win the Election (JOI22_ho_t3)	C++17	33 / 100	382 ms	600 KiB

Main

#include<bits/stdc++.h>
typedef long double ld;
#define fastio cin.tie(0), cout.tie(0), ios::sync_with_stdio(0);
using namespace std;

#define F first 
#define S second

int main(){
    fastio
    const int big = 1e6;
    int n, k;
    ld ans = big;
    cin >> n >> k;
    vector<pair<int, int>> ba(n);
    for(int i=0; i<n; i++){
        cin >> ba[i].S >> ba[i].F;
        if(ba[i].F==-1) ba[i].F = big;
    }
    sort(ba.begin(), ba.end());
    if(n>20){
        for(int i=0; i<=k; i++){
            if(i && ba[i-1].F==big) break;
            ld tmp = 0;
            for(int j=0; j<i; j++)
                tmp += ((ld)ba[j].F)/(1+j);
            vector<int> rem(n-i);
            for(int j=i; j<n; j++) rem[j-i] = ba[j].S;
            sort(rem.begin(), rem.end());
            int hr = 0;
            for(int j=0; j<k-i; j++) hr += rem[j];
            tmp += ((ld)hr)/(1+i);
            ans = min(ans, tmp);
        }
        cout << fixed << setprecision(6) << ans << '\n';
        return 0;
    }
    for(int mask = 0; mask<(1<<n); mask++){
        bool flag = 0;
        vector<int> b, a;
        for(int i=0; i<n; i++){
            if(mask&(1<<i)){
                if(ba[i].F==big){
                    flag = 1;
                    break;
                }
                b.push_back(ba[i].F);
            }
            else a.push_back(ba[i].S);
        }
        if(flag || b.size()>=k) break;
        sort(a.begin(), a.end());
        ld tmp = 0;
        for(int i=0; i<b.size(); i++)
            tmp += ((ld)b[i])/(1+i);
        for(int i=0; i<k-b.size(); i++){
            tmp += ((ld)a[i])/(1+b.size());
        }
        ans = min(tmp, ans);
    }
    cout << fixed << setprecision(6) << ans << '\n';
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:51:28: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   51 |         if(flag || b.size()>=k) break;
      |                    ~~~~~~~~^~~
Main.cpp:54:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |         for(int i=0; i<b.size(); i++)
      |                      ~^~~~~~~~~
Main.cpp:56:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   56 |         for(int i=0; i<k-b.size(); i++){
      |                      ~^~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 11 / 11
• Subtask 4: 12 / 12
• Subtask 5: 0 / 33
• Subtask 6: 0 / 11
• Subtask 7: 0 / 23