oj.uz

Submission #843634

# Submission time Handle Problem Language Result Execution time Memory
843634 2023-09-04T10:05:44 Z vjudge1 Sure Bet (CEOI17_sure) C++
100 / 100
 118 ms 3744 KB 
#define COPYRIGHT CODE BY TRINH TUAN NGHIA
#include<bits/stdc++.h>
#define Boost ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0)
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("popcnt")
#define ll long long
#define endl "\n"
#define st first
#define nd second
#define ii pair <ll,ll>
#define iii pair <ll,ii>
#define iiii pair <ii,ii>
#define pb push_back
#define NAME "surebet"
using namespace std;
const ll N = 1e5 + 10;
double a[N];
double b[N];
ll n;
ll na, nb;
double sa, sb;
void inp (){
    cin >> n;
    for (int i = 1; i <= n; ++i){
        cin >> a[i] >> b[i];
    }
}
void solve(){
    double l = 0, r = 1e9;
    sort (a + 1,a + n + 1, greater<>());
    sort (b + 1, b + n + 1, greater<>());
    double ans =0 ;
    for (int j = 0 ; j <= 50; ++j){
        double m = (l + r) / 2;
        sa = 0;
        sb = 0;
        na = 0;
        nb = 0;
        bool check = false;
        for (int i = 0; i<= 2 * n; ++i){
            while (sa - i < m and na < n){
                sa += a[na + 1];
                //cout << "Dcm " << sa << " " << m << endl;
                ++na;
            }
            while (sb - i < m and nb < n){
                sb += b[nb + 1];
                ++nb;
            }
            while (sa - i - a[na] >= m){
                sa -= a[na];
                --na;
            }
            while (sb - i - b[nb] >=m){
                sb -= b[nb];
                --nb;
            }
            if (na + nb <= i and sa - i >= m and sb - i >= m){
                check = true;
                ans = max(ans, m);
            }

        }
        if (check)l = m;
        else r = m;

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

}
signed main (){
    if (fopen(NAME".inp", "r")){
        freopen(NAME".inp", "r", stdin);
        freopen(NAME".out", "w", stdout);
    }
    Boost;
    inp();
    solve();
}
/*
input

*/

/*
output

*/

Compilation message

sure.cpp: In function 'int main()':
sure.cpp:74:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   74 |         freopen(NAME".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
sure.cpp:75:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   75 |         freopen(NAME".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 1 ms 500 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 464 KB Output is correct

Subtask #2
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 1 ms 500 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 464 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 0 ms 460 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 2 ms 348 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 2 ms 348 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 2 ms 604 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 1 ms 500 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 464 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 0 ms 460 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 2 ms 348 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 2 ms 348 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 2 ms 604 KB Output is correct
17 Correct 118 ms 3156 KB Output is correct
18 Correct 116 ms 3368 KB Output is correct
19 Correct 113 ms 3368 KB Output is correct
20 Correct 118 ms 3156 KB Output is correct
21 Correct 113 ms 3736 KB Output is correct
22 Correct 114 ms 3372 KB Output is correct
23 Correct 115 ms 3372 KB Output is correct
24 Correct 115 ms 3156 KB Output is correct
25 Correct 111 ms 3368 KB Output is correct
26 Correct 107 ms 3744 KB Output is correct