Submission #1027458

#	Time	Username	Problem	Language	Result	Execution time	Memory
1027458		vjudge1	Sure Bet (CEOI17_sure)	C++17	100 / 100	89 ms	7764 KiB

sure

#include<bits/stdc++.h>
#ifdef LOCAL
#include "D:\debug.h"
#else
#define cebug(...) "Orz_chUoNgnn_khanhtb_0x2ee08"
#endif

using namespace std;

#define fi first 
#define se second
#define pb push_back
#define ll long long
#define ii pair<int, int>
#define vi vector<int> 
#define vll vector<ll>
#define vii vector<ii>
#define cd complex<double>
#define ld long double
const ll mod = 1e9 + 7;
const ll INF = 1e18L + 5;
const double PI = acos(-1);
const int block = 320;
const int N = 2e5;
int tc, tt = 1;

int n;
ld a[N + 5], b[N + 5];
ld f[N + 5];
ld eps = 0.000000001;

void solve() {
    cin>>n;
    for(int i=1; i<=n; i++) cin>>a[i]>>b[i];
    ld ans = 0;
    sort(a + 1, a + 1 + n, greater<ld>());
    sort(b + 1, b + 1 + n, greater<ld>());
    for(int l=1; l<=2; l++) {
        for(int i=1; i<=n; i++) f[i] = f[i - 1] + b[i];
        ld sum = 0;
        for(int i=1; i<=n; i++) {
            sum += a[i];
            ld mi = 1e9;
            int l = 1, r = n;
            while(l <= r) {
                int mid = (l + r)/2;
                if(f[mid] - sum >= 0.0) {
                    mi = mid;
                    r = mid - 1;
                }
                else l = mid + 1;
            }
            ans = max(ans, sum - i - mi);
        }
        for(int i=1; i<=n; i++) swap(a[i], b[i]);
    }
    cout<<fixed<<setprecision(4)<<ans;
}
signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    for(tc=1; tc<=tt; tc++) solve();
    cerr<<"\nTime elapsed: "<<1000.0*clock()/CLOCKS_PER_SEC<<" ms.\n";
    return 0;
}

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