Submission #607287

#	Time	Username	Problem	Language	Result	Execution time	Memory
607287		Duy_e	Balloons (CEOI11_bal)	C++14	30 / 100	198 ms	5068 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 c = r[i] + r[j]; c = c * c;
    double a = r[i] - r[j]; a = a * a;
    double b = x[j] - x[i]; b = b * b;
    return c - a >= b;
}

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();

        while (st.size() > 1 && touch(st.top(), i)) {
            r[i] = cal(st.top(), i);
            if (r[i] < r[st.top()]) break;
            st.pop();
        }
        st.push(i);
        cout << setprecision(3) << fixed << r[i] << '\n';
    }
 
    return 0;
}    
/**  /\_/\
*   (= ._.)
*   / >🍵 \>🍮
**/

Compilation message (stderr)

bal.cpp:55:9: warning: "/*" within comment [-Wcomment]
   55 | /**  /\_/\
      |

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 0 / 10
• Subtask 4: 10 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10