Submission #1225785

#	Time	Username	Problem	Language	Result	Execution time	Memory
1225785		theiulius	Sure Bet (CEOI17_sure)	C++20	20 / 100	0 ms	328 KiB

sure

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define ff first
#define ss second
#define pb push_back
// #define endl "\n"
int n;

main(){
    /*ifstream cin(".in");
    ofstream cout(".out");*/
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    cin >> n;
    float a[n] = {}, b[n] = {};
    for (int i = 0; i < n; i++){
        cin >> a[i] >> b[i];
    }
    
    sort(a, a + n, greater<float>()); 
    sort(b, b + n, greater<float>());
    float pre[n] = {b[0]};
    int nd = n;
    for (int i = 1; i < n; i++){
        if (b[i] < 1 && nd == n){
            nd = i;
        }
        pre[i] = pre[i - 1] + b[i];
    }

    float left = 0, res = (float)0;
    for (int i = 0; i < n; i++){
        left += a[i];
        if (a[i] < 1){
            break;
        }
        
        int l = 0, r = nd - 1, ans = nd - 1;
        while (l <= r){
            int mid = (l + r) / 2;
            
            float right = pre[mid];
            
            if (right >= left){
                ans = mid;
                r = mid - 1;
            }else{
                l = mid + 1;
            }
        }
        
        res = max(res, (float)min(pre[ans] - (float)ans - (float)i - 2.0, (float)left - (float)ans - (float)i - 2.0));
        // cout << (float)left - (float)ans - (float)i - 2.0 << endl;
        if (ans){
            ans -= 1.0;
            res = max(res, (float)min(pre[ans] - (float)ans - (float)i - 2.0, (float)left - (float)ans - (float)i - 2.0));
        }
    }
    
    printf("%.4lf",(float)res);
}

Compilation message (stderr)

sure.cpp:10:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   10 | main(){
      | ^~~~

• Subtask 1: 20 / 20
• Subtask 2: 0 / 40
• Subtask 3: 0 / 40