Submission #997396

#	Time	Username	Problem	Language	Result	Execution time	Memory
997396		vjudge1	Balloons (CEOI11_bal)	C++14	100 / 100	119 ms	7144 KiB

bal

#include <bits/stdc++.h>

using namespace std;

#define f first
#define s second
#define pb push_back
#define sz(x) int((x).size())
#define all(x) begin(x), end(x)
#define rep(i, l, r) for (int i = (int) (l); i <= (int) (r); i++)
#define rev(i, r, l) for (int i = (int) (r); i >= (int) (l); i--)

using namespace std;

using vi = vector <int>;
using pi = pair <int, int>;
typedef long long ll;
typedef unsigned long long ull;

template <class X, class Y> inline bool maximize(X &x, const Y &y) {return x < y ? x = y, 1 : 0;}
template <class X, class Y> inline bool minimize(X &x, const Y &y) {return x > y ? x = y, 1 : 0;}

const int INF = (int) 1e9 + 7;
const int MOD = (int) 1e9 + 7;

int n;

double calc_r(pair<double, double> a, double bx) {
    return (a.first - bx) * (a.first - bx) / (4 * a.second);
}

void inp() {

}

void sol() {
    cin >> n;
    vector<double> final_radius(n);
    stack<pair<double, double>> to_check;
    for (int i = 0; i < n; i++) {
        double x, r;
        cin >> x >> r;
        double max_r = r;
        while (!to_check.empty()) {
            pair<double, double> last = to_check.top();
            double to_last_r = calc_r(last, x);
            max_r = min(max_r, to_last_r);
            if (max_r >= last.second) {
                to_check.pop();
                continue;
            }
            else break;
        }
        to_check.push({x, max_r});
        final_radius[i] = max_r;
    }
    cout << fixed << setprecision(3);
    for (double &r : final_radius) cout << r << "\n";
}

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    #define task ""

    if (fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }

    int test = 1; //cin >> test;
    while (test--) {
        inp();
        sol();
    }
}

Compilation message (stderr)

bal.cpp: In function 'int main()':
bal.cpp:68:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   68 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
bal.cpp:69:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   69 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• 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