Submission #871112

#	Time	Username	Problem	Language	Result	Execution time	Memory
871112		HorizonWest	Let's Win the Election (JOI22_ho_t3)	C++17	10 / 100	1 ms	348 KiB

Main

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

#define endl '\n'
#define db double
#define ll __int128
#define int long long
#define pb push_back
#define fs first
#define sd second
#define Mod long(1e9 + 7)
#define all(x) x.begin(), x.end()
#define unvisited long(-1)
#define Eps double(1e-9)
#define _for(i, n) for(int i = 0; i < (n); i++)
#define dbg(x) cout << #x ": " << x << endl;

const int Max = 1e6 + 7, Inf = 1e9 + 7;

void print(bool x) { cout << (x ? "YES" : "NO") << endl; }

string tostring (__int128 x)
{
    string ans = "";
    while(x > 0)
    {
        ans += (x % 10 + '0');
        x /= 10;
    }
    reverse(all(ans));
    return ans;
}

void printdb(double ans, int k)
{
    cout << setiosflags(ios::fixed)
         << setiosflags(ios::showpoint)
         << setprecision(k) << ans << endl;
}

void solve()
{
    int n, k; cin >> n >> k; 
    vector <pair<db, db>> a(n), b(n); 
    for(int i = 0; i < n; i++) 
    {
        cin >> a[i].fs >> b[i].fs; 
        a[i].sd = b[i].sd = i; 
        if(b[i].fs == -1) b[i].fs = Inf;  
    } 

    sort(all(a)); sort(all(b)); db ans = Inf, t = 0.0;

    vector <db> f(n+1, 1); 

    for(db i = 1; i <= k; i++)
    {
        db Z = 0.0; db c = 0; 
        for(db j = 0; j < n; j++)
        {
            if(c == k - i + 1) break;
           // cout << a[j].fs << " " << f[a[j].sd] << endl; 
            c += f[a[j].sd]; 
            Z += f[a[j].sd] * a[j].fs;
        }
        //cout << Z << " " << t << endl; 
        Z = Z / i + t; 
        t = t + b[i-1].fs / i;  
        ans = min(ans, Z); f[b[i-1].sd] = 0.0; 
        if(b[i-1].fs == Inf) break;
    }

    printdb(ans, 5); 
}

int32_t main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    int Q = 1; //cin >> Q;

    while (Q--)
    {
        solve();
    }

    return 0;
}

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