Submission #498348

#	Time	Username	Problem	Language	Result	Execution time	Memory
498348		Nalrimet	Sure Bet (CEOI17_sure)	C++17	100 / 100	181 ms	6768 KiB

sure

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

//#define int long long
#define ll long long
#define ld long double
#define pb push_back
#define S second
#define F first

//const int inf = 1e18;
const int N = 100005;

int n, y;
long double a[N], b[N], pref[N], suma, ans;

ld f(int x){
//    cout << x << ' ' << y << ' ' << pref[x] << ' ' << suma << '\n';
    return min(pref[x], suma) - x - y;
}

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

    cin >> n;

    for(int i = 1; i <= n; ++i){
        cin >> a[i] >> b[i];
    }

    sort(a + 1, a + 1 + n, greater<ld>());
    sort(b + 1, b + 1 + n, greater<ld>());


    for(int i = 0; i <= n; ++i){
        pref[i] += pref[i - 1] + b[i];
    }

    for(int i = 0; i <= n; ++i){
//        cout << a[i] << ' ';
        suma += a[i];
        y = i;
//        for(int j = 0; j <= n; ++j){
//        }
        int l = 0, r = n;
//        ld = eps = 1e-9
        while(r - l > 2){
            int m1 = l + (r - l) / 3, m2 = r - (r - l) / 3;
            if(f(m1) < f(m2))
                l = m1 + 1;
            else
                r = m2 - 1;
        }
        ans = max(ans, f(l));
        if(l + 1 <= n)
            ans = max(ans, f(l + 1));
        if(l + 2 <= n)
            ans = max(ans, f(l + 2));

    }

    cout << fixed << setprecision(4) << ans;
}

Compilation message (stderr)

sure.cpp:22:2: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   22 |  main(){
      |  ^~~~

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