Submission #607242

#	Time	Username	Problem	Language	Result	Execution time	Memory
607242		Duy_e	Balloons (CEOI11_bal)	C++14	0 / 100	183 ms	8012 KiB

bal

#include <bits/stdc++.h>
#define ll long long
#define pii pair<ll, ll>
#define st first
#define nd second
#define file "test"
using namespace std;
const long long INF = 1e18;
const long long N = 2e5 + 5;
const long long eps = 1e-6;
stack <int> st;
ll x[N], n;
double r[N];

bool touch(int i, int j) {
    double a = r[i] - r[j], b = x[j] - x[i];
    double c = a * a + b * b;
    double sum = r[i] + r[j];
    return sum * sum <= c;
}

double cal(int i, int j) {
    if (i == 0) return r[j];
    double a = r[i], b = x[j] - x[i];
    double ans = b * b / ((double)4.0 * a);
    return min(ans, r[j]);
}

int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    // #ifndef ONLINE_JUDGE
    //     freopen(file".inp", "r", stdin); freopen(file".out", "w", stdout);
    // #endif
    
    cin >> n;

    st.push(0);
    for (int i = 1; i <= n; i ++) {
        cin >> x[i] >> r[i];
        while (st.size() > 1 && !touch(st.top(), i) && r[i] > r[st.top()]) st.pop();
        // cout << st.top() << ' ';
        r[i] = cal(st.top(), i);
        st.push(i);
        cout << setprecision(3) << fixed << r[i] << '\n';
    }

    return 0;
}    
/**  /\_/\
*   (= ._.)
*   / >🍵 \>🍮
**/

Compilation message (stderr)

bal.cpp:50:9: warning: "/*" within comment [-Wcomment]
   50 | /**  /\_/\
      |

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
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• Subtask 10: 0 / 10