Submission #767367

#	Time	Username	Problem	Language	Result	Execution time	Memory
767367		raysh07	Sure Bet (CEOI17_sure)	C++17	100 / 100	74 ms	5960 KiB

sure

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define INF (int)1e18
#define f first
#define s second

mt19937_64 RNG(chrono::steady_clock::now().time_since_epoch().count());

void Solve() 
{
    int n; cin >> n;
    vector <double> a(n), b(n);
    for (int i = 0; i < n; i++){
        cin >> a[i] >> b[i];
    }
    
    sort(a.begin(), a.end(), greater<double>());
    sort(b.begin(), b.end(), greater<double>());
    
    vector <double> pa, pb;
    pa.push_back(0);
    pb.push_back(0);
    for (auto x : a) pa.push_back(pa.back() + x);
    for (auto x : b) pb.push_back(pb.back() + x);
    
    double ans = 0;
    for (int i = 0; i <= n; i++){
        int id = lower_bound(pb.begin(), pb.end(), pa[i]) - pb.begin();
        if (id > n) continue;
        ans = max(ans, pa[i] - i - id);
    }
    for (int i = 0; i <= n; i++){
        int id = lower_bound(pa.begin(), pa.end(), pb[i]) - pa.begin();
        if (id > n) continue;
        ans = max(ans, pb[i] - i - id);
    }
    
    cout << fixed << setprecision(4) << ans << "\n";
}

int32_t main() 
{
    auto begin = std::chrono::high_resolution_clock::now();
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int t = 1;
 //   cin >> t;
    for(int i = 1; i <= t; i++) 
    {
        //cout << "Case #" << i << ": ";
        Solve();
    }
    auto end = std::chrono::high_resolution_clock::now();
    auto elapsed = std::chrono::duration_cast<std::chrono::nanoseconds>(end - begin);
    cerr << "Time measured: " << elapsed.count() * 1e-9 << " seconds.\n"; 
    return 0;
}

• Subtask 1: 20 / 20
• Subtask 2: 40 / 40
• Subtask 3: 40 / 40