oj.uz

Submission #1100284

# Submission time Handle Problem Language Result Execution time Memory
1100284 2024-10-13T12:31:46 Z michified Balloons (CEOI11_bal) C++17
20 / 100
 644 ms 13964 KB 
#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define lid id * 2 + 1
#define rid id * 2 + 2
using namespace std;

const ll mod = 1e9 + 7;

ld bestR(ld x1, ld r1, ld x2, ld r2) {
    ld l = 0, r = r2 + 1;
    while (l < r - 0.0001) {
        ld mid = (l + r) / 2;
        if (sqrtl((x2 - x1) * (x2 - x1) + abs(r1 - mid) * abs(r1 - mid)) >= r1 + mid) l = mid;
        else r = mid - 0.0001;
    }
    return min(r2, l);
}

int main() {
    // ifstream cin("balancing.in");
    // ofstream cout("balancing.out");

    int n, i;
    cin >> n;
    vector<ld> x(n), r(n);
    for (i = 0; i < n; i++) cin >> x[i] >> r[i];
    vector<ld> ans(n);
    stack<int> st;
    ans[0] = r[0];
    st.push(0);
    for (i = 1; i < n; i++) {
        ld res = r[i];
        while (not st.empty()) {
            res = min(res, bestR(x[st.top()], ans[st.top()], x[i], r[i]));
            if (res > ans[st.top()]) st.pop();
            else break;
        }
        ans[i] = res;
        st.push(i);
    }
    for (i = 0; i < n; i++) cout << fixed << setprecision(3) << ans[i] << endl;
    return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB 10 numbers

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB 2 numbers

Subtask #3
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 340 KB 168th numbers differ - expected: '4.5000000000', found: '4.5020000000', error = '0.0020000000'
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 9 ms 340 KB 114th numbers differ - expected: '39.0180000000', found: '39.0200000000', error = '0.0020000000'
2 Halted 0 ms 0 KB -

Subtask #5
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 60 ms 1568 KB 1374th numbers differ - expected: '139.5920000000', found: '139.5940000000', error = '0.0020000000'
2 Halted 0 ms 0 KB -

Subtask #6
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 158 ms 3752 KB 36728th numbers differ - expected: '9.9570000000', found: '9.9590000000', error = '0.0020000000'
2 Halted 0 ms 0 KB -

Subtask #7
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 320 ms 7244 KB 14857th numbers differ - expected: '7169.6020000000', found: '7169.5880000000', error = '0.0140000000'
2 Halted 0 ms 0 KB -

Subtask #8
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 354 ms 8524 KB 5459th numbers differ - expected: '5071.1870000000', found: '5071.1920000000', error = '0.0050000000'
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 474 ms 11340 KB 1734th numbers differ - expected: '1856.0220000000', found: '1856.0390000000', error = '0.0170000000'
2 Halted 0 ms 0 KB -

Subtask #10
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 644 ms 13964 KB 2716th numbers differ - expected: '22.1690000000', found: '22.1670000000', error = '0.0020000000'
2 Halted 0 ms 0 KB -