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Submission #878004

# Submission time Handle Problem Language Result Execution time Memory
878004 2023-11-24T02:02:28 Z phong Sure Bet (CEOI17_sure) C++17
100 / 100
 229 ms 2132 KB 
#include <bits/stdc++.h>


using ll = long long;
const int nmax = 1e5 + 5;
const int lg = 20;
const int mod = 1e9 + 7;
const ll oo = 1e18;
#define fi first
#define se second
#define pii pair<int, int>
using namespace std;

int n, q, t;

double a[nmax], b[nmax];

bool check(double k){
    for(int i = 0; i <= n; ++i){
        int l = 0, r = n, it1 = -1;
        while(l <= r){
            int mid = r + l >> 1;
            if(a[i] - i - mid >= k){
                it1 = mid;
                l = mid + 1;
            }
            else r = mid - 1;
        }
        if(it1 != -1){
            if(a[i] - i - it1 >= k && b[it1] - it1 - i >= k) return 1;
        }
    }
    return 0;
}
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL), cout.tie(NULL);
//    freopen("code.inp", "r", stdin);
//    freopen("code.out", "w", stdout);
    cin >> n;
    for(int i = 1; i <= n; ++i) cin >> a[i] >> b[i];
    sort(a + 1, a + 1 + n, greater<double> ());
    sort(b + 1, b + 1 + n, greater<double> ());
    for(int i = 1; i <= n; ++i){
        a[i] += a[i - 1];
        b[i] += b[i - 1];
    }
    double l = 0, r = 2e8, kq = 0;
    for(int t = 1; t <= 50; ++t){
        double mid = (r + l) / 2;
        if(check(mid)){
            kq = mid;
            l = mid;
        }
        else r = mid;
    }
    cout << fixed << setprecision(4) << kq;
}
/*
10
4.0530 1.2670
4.3790 2.1420
1.9230 2.1920
3.3740 1.0850
0.9690 3.4510
1.5270 0.5160
4.3860 1.3360
4.5560 1.5050
4.9650 1.8120
0.6250 0.4820

*/

Compilation message

sure.cpp: In function 'bool check(double)':
sure.cpp:22:25: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   22 |             int mid = r + l >> 1;
      |                       ~~^~~

Subtask #1
20.0 / 20.0

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

Subtask #2
40.0 / 40.0

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

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 344 KB Output is correct
12 Correct 2 ms 344 KB Output is correct
13 Correct 2 ms 348 KB Output is correct
14 Correct 2 ms 348 KB Output is correct
15 Correct 2 ms 348 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 201 ms 1996 KB Output is correct
18 Correct 229 ms 1856 KB Output is correct
19 Correct 216 ms 1812 KB Output is correct
20 Correct 209 ms 2000 KB Output is correct
21 Correct 139 ms 1872 KB Output is correct
22 Correct 204 ms 1996 KB Output is correct
23 Correct 229 ms 2000 KB Output is correct
24 Correct 216 ms 2132 KB Output is correct
25 Correct 208 ms 1876 KB Output is correct
26 Correct 133 ms 1996 KB Output is correct