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Submission #312548

# Submission time Handle Problem Language Result Execution time Memory
312548 2020-10-13T16:55:34 Z fatemetmhr Balloons (CEOI11_bal) C++17
10 / 100
 487 ms 9732 KB 
#include<bits/stdc++.h>
#define sanastd using namespace std
sanastd;

const int MAXN = 1000 * 1000 + 10;
const long long INF = 1LL * 1000 * 1000 * 1000 * 1000 * 1000 * 1000 + 10;

int n, r[MAXN], x[MAXN];
long double ans[MAXN];
stack <int> balloon;

bool check(int ind1, int ind2, double mid)
{
    long double d = (x[ind1] - x[ind2]) * (x[ind1] - x[ind2]) + (ans[ind2] - mid) * (ans[ind2] - mid);
    if(sqrt(d) < mid + ans[ind2]) return 0;
    else return 1;
}
int main ()
{
    cout<<fixed<<setprecision(15);
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);

    cin >> n >> x[0] >> r[0];
    balloon.push(0);
    ans[0] = r[0];
    cout << r[0] << endl;
    for(int i = 1; i < n; i++){
        cin >> x[i] >> r[i];
        ans[i] = r[i];
        while(!balloon.empty() and r[balloon.top()] <= ans[i]){
            long double lo = 0, hi = ans[i] + 0.0001;
            while(hi - lo > 0.0001){
                long double mid = (hi + lo) / 2.0;
                if(check(i, balloon.top(), mid)) lo = mid;
                else hi = mid;
            }
            ans[i] = min(ans[i], lo);
            if(ans[i] >= r[balloon.top()]) balloon.pop();
        }
        if(!balloon.empty()){
            long double lo = 0, hi = ans[i] + 0.0001;
            while(hi - lo > 0.0001){
                long double mid = (hi + lo) / 2.0;
                if(check(i, balloon.top(), mid)) lo = mid;
                else hi = mid;
            }
            ans[i] = min(ans[i], lo);
        }
        balloon.push(i);
        cout << ans[i] << '\n';
    }
    return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB 10 numbers

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 384 KB 2nd numbers differ - expected: '252735385.4379999936', found: '0.9333689377', error = '252735384.5046310425'

Subtask #3
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 384 KB 5th numbers differ - expected: '0.1170000000', found: '1.0000000000', error = '0.8830000000'

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 6 ms 512 KB 148th numbers differ - expected: '8.2380000000', found: '26.0000000000', error = '17.7620000000'

Subtask #5
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 49 ms 1272 KB 196th numbers differ - expected: '100.7250000000', found: '111.0000000000', error = '10.2750000000'

Subtask #6
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 140 ms 2680 KB 744th numbers differ - expected: '14594.0000000000', found: '12745.9183089851', error = '1848.0816910149'
2 Halted 0 ms 0 KB -

Subtask #7
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 282 ms 5172 KB 7239th numbers differ - expected: '0.0590000000', found: '1.0000000000', error = '0.9410000000'

Subtask #8
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 322 ms 6004 KB 4651st numbers differ - expected: '0.4220000000', found: '1.0000000000', error = '0.5780000000'
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 427 ms 7840 KB 1730th numbers differ - expected: '5.6890000000', found: '6.8058495467', error = '1.1168495467'
2 Halted 0 ms 0 KB -

Subtask #10
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 487 ms 9732 KB 2718th numbers differ - expected: '2.2100000000', found: '3.0000000000', error = '0.7900000000'
2 Halted 0 ms 0 KB -