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Submission #148086

# Submission time Handle Problem Language Result Execution time Memory
148086 2019-08-31T13:44:55 Z WhipppedCream Sure Bet (CEOI17_sure) C++17
100 / 100
 238 ms 3644 KB 
//
#include <bits/stdc++.h>
//#ifdef atom #else #endif
using namespace std;
typedef long long ll;
typedef pair<int, int> ii;
#define X first
#define Y second
#define vi vector<int>
#define vvi vector< vi >
#define vii vector< ii >
#define mp make_pair
#define pb push_back
const int maxn = 1e5+5;
double A[maxn], B[maxn];
int n;
double solve(int k)
{
    int lo = max(0, k-n), hi = min(n, k);
    double best = -1e9;
    while(lo<= hi)
    {
        int mid = (lo+hi)/2;
        //printf("%d %d\n", lo, hi);
        double x = A[mid];
        double y = B[k-mid];
        //printf("%.4lf %.4lf\n", x, y);
        if(x == y) return x;
        best = max(best, min(x, y));
        if(x< y) lo = mid+1;
        else hi = mid-1;
    }
    //printf("%d: %.4lf\n", k, best);
    return best;
}
int main()
{
    //#ifndef atom freopen(".in", "r", stdin); freopen(".out", "w", stdout); #endif
    scanf("%d", &n);
    for(int i = 1; i<= n; i++)
    {
        cin >> A[i] >> B[i];
    }
    sort(A+1, A+n+1); sort(B+1, B+n+1);
    reverse(A+1, A+n+1); reverse(B+1, B+n+1);
    for(int i = 1; i<= n; i++)
    {
        A[i] += A[i-1]; B[i] += B[i-1];
        //cout << A[i] << " " << B[i] << endl;
    }
    double best = 0;
    for(int i = 1; i<= 2*n; i++) best = max(best, solve(i)-i);
    printf("%.4lf\n", best);
}

Compilation message

sure.cpp: In function 'int main()':
sure.cpp:39:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct

Subtask #2
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 2 ms 376 KB Output is correct
11 Correct 2 ms 376 KB Output is correct
12 Correct 4 ms 376 KB Output is correct
13 Correct 4 ms 376 KB Output is correct
14 Correct 4 ms 380 KB Output is correct
15 Correct 4 ms 384 KB Output is correct
16 Correct 4 ms 380 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 2 ms 376 KB Output is correct
11 Correct 2 ms 376 KB Output is correct
12 Correct 4 ms 376 KB Output is correct
13 Correct 4 ms 376 KB Output is correct
14 Correct 4 ms 380 KB Output is correct
15 Correct 4 ms 384 KB Output is correct
16 Correct 4 ms 380 KB Output is correct
17 Correct 203 ms 3224 KB Output is correct
18 Correct 203 ms 3172 KB Output is correct
19 Correct 203 ms 3264 KB Output is correct
20 Correct 204 ms 3192 KB Output is correct
21 Correct 235 ms 3644 KB Output is correct
22 Correct 203 ms 3192 KB Output is correct
23 Correct 203 ms 3312 KB Output is correct
24 Correct 207 ms 3256 KB Output is correct
25 Correct 204 ms 3296 KB Output is correct
26 Correct 238 ms 3576 KB Output is correct