Submission #1052632

#	Time	Username	Problem	Language	Result	Execution time	Memory
1052632		VMaksimoski008	Sure Bet (CEOI17_sure)	C++17	100 / 100	76 ms	4432 KiB

sure

#include <bits/stdc++.h>
//#define int long long

using namespace std;

using ll = long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;

const int mod = 1e9 + 7;
const int LOG = 20;
const int maxn = 1e5 + 5;

signed main() {
    int n; cin >> n;

    vector<double> a(n), b(n), pref(n);
    for(int i=0; i<n; i++) cin >> a[i] >> b[i];
    sort(a.rbegin(), a.rend());
    sort(b.rbegin(), b.rend());
    pref[0] = b[0];
    for(int i=1; i<n; i++) pref[i] = pref[i-1] + b[i];

    double ans = 0;

    double sum1 = 0;
    //sum1, i fixed
    //(sum1 - i - 2) - j
    //(sum2 - j) - (i - 2)
    double l=0, r=1e9;
    while(r - l > 1e-6) {
        double mid = (l + r) / 2;
        bool ok = 0;

        double sum1 = 0;
        for(int i=0; i<n&&!ok; i++) {
            sum1 += a[i];
            if(sum1 - i - 2 < mid) continue;
            double tmp = (sum1 - i - 2) - mid;
            int mx = tmp;
            mx = min(mx, n-1);
            if(pref[mx] - mx - i - 2 >= mid && sum1 - i - 2 - mx >= mid) ok = 1;
        }

        if(ok) ans = l = mid;
        else r = mid;
    }

    cout << setprecision(4) << fixed << ans << '\n';
    return 0;
}

Compilation message (stderr)

sure.cpp: In function 'int main()':
sure.cpp:26:12: warning: unused variable 'sum1' [-Wunused-variable]
   26 |     double sum1 = 0;
      |            ^~~~

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