Submission #151750

#	Time	Username	Problem	Language	Result	Execution time	Memory
151750		forestryks	Balloons (CEOI11_bal)	C++14	100 / 100	329 ms	16636 KiB

bal

#include <bits/stdc++.h>
using namespace std;

using ll = long long;
using ld = long double;
using pii = pair<int, int>;
#define rep(i, n) for (int (i) = 0; (i) < (n); ++(i))
#define all(x) (x).begin(), (x).end()
#define FAST_IO ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define f first
#define s second

const int MAXN = 2e5 + 5;
int n;
pair<ld, ld> a[MAXN];

ld get(ld x1, ld r1, ld x) {
    return (x1 - x) * (x1 - x) / 4 / r1;
}

int main() {
    FAST_IO;
    cout.precision(10);
    cout.setf(ios::fixed);

    cin >> n;
    rep(i, n) {
        cin >> a[i].f >> a[i].s;
    }

    vector<pair<ld, ld>> st;
    rep(i, n) {
        while (!st.empty()) {
            a[i].s = min(a[i].s, get(st.back().f, st.back().s, a[i].f));
            if (a[i].s > st.back().s) st.pop_back();
            else break;
        }

        st.push_back(a[i]);
        cout << a[i].s << '\n';
    }
}

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