Submission #920192

#	Time	Username	Problem	Language	Result	Execution time	Memory
920192		Alihan_8	Sure Bet (CEOI17_sure)	C++17	100 / 100	74 ms	8028 KiB

sure

#include <bits/stdc++.h>

using namespace std;

#define all(x) x.begin(), x.end()
#define ar array
#define pb push_back
#define ln '\n'
#define int long long

using i64 = long long;

template <class F, class _S>
bool chmin(F &u, const _S &v){
    bool flag = false;
    if ( u > v ){
        u = v; flag |= true;
    }
    return flag;
}

template <class F, class _S>
bool chmax(F &u, const _S &v){
    bool flag = false;
    if ( u < v ){
        u = v; flag |= true;
    }
    return flag;
}

#define double long double

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int n; cin >> n;
    vector <double> a(n), b(n);
    for ( int i = 0; i < n; i++ ){
        cin >> a[i] >> b[i];
    }
    sort(all(a), greater <double> ());
    sort(all(b), greater <double> ());
    b.pb(0), a.pb(0);
    vector <double> pf(n + 1);
    for ( int i = 0; i < n; i++ ){
        pf[i + 1] = pf[i] + b[i];
    }
    int j = 0;
    double opt = 0, cnt = 0, mx = 0;
    for ( int i = 0; i <= n; i++ ){
        while ( j <= n && pf[j] <= cnt ){
            chmax(mx, pf[j] - j);
            j++;
        }
        chmax(opt, mx - i);
        if ( j <= n ){
            chmax(opt, cnt - (i + j));
        }
        cnt += a[i];
    }
    cout << fixed << setprecision(4) << opt;

    cout << '\n';
}

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