Submission #719833

#	Time	Username	Problem	Language	Result	Execution time	Memory
719833		MarwenElarbi	Balloons (CEOI11_bal)	C++14	10 / 100	460 ms	1856 KiB

bal

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#define vi vector<int>
#define ve vector
#define ll long long
#define vl vector<ll>
#define vll vector<pair<ll,ll>>
#define onbit __builtin_popcount
#define ii pair<int,int>
#define vvi vector<vi>
#define vii vector<ii>
#define gii greater<ii>
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define INF 1e18
#define eps 1e-7
#define eps1 1e-2
#define optimise ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
#define MAX_A 1e5+5
using namespace std;
using namespace __gnu_pbds;
template <class T>
using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
const ll MOD = 1e9+7;
const int nax = 1e5+5;
const int MAX_VAL = 1e6;
double PI=3.14159265359;
int arx[8]={1,1,0,-1,-1,-1, 0, 1};
int ary[8]={0,1,1, 1, 0,-1,-1,-1};
typedef complex<int> Point;
#define X real()
#define Y imag()
void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}
double calculate(double x,double y,double a, double b){
    return sqrt((x-a)*(x-a)+(y-b)*(y-b));
}
int main(){
    optimise;
    // setIO("walk");
    int n;
    cin>>n;
    stack<pair<double,double>> tab;
    for (int i = 0; i < n; ++i)
    {
        double x;
        double y;
        cin>>x>>y;  
        if (tab.empty())
        {
            cout << fixed <<setprecision(3)<<y<<endl;
            tab.push({x,y});
        }else{
            double maxr=y;
            while (!tab.empty()){
                double r=(x-tab.top().fi)*(x-tab.top().fi)/(4*tab.top().se);
                maxr=min(maxr,r);
                // cout << maxr <<" "<<tab.top().se<<endl;
                if (maxr>=tab.top().se){
                    tab.pop();
                }else{
                    break;
                }
            }
            cout << fixed <<setprecision(3)<<maxr <<endl;
        }
    }

}
  

Compilation message (stderr)

bal.cpp: In function 'void setIO(std::string)':
bal.cpp:36:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bal.cpp:37:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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