Submission #941662

#	Time	Username	Problem	Language	Result	Execution time	Memory
941662		tnknguyen_	Balloons (CEOI11_bal)	C++14	30 / 100	2063 ms	2820 KiB

bal

#include <bits/stdc++.h>
using namespace std;
#define endl '\n' 
#define pll pair<long long, long long>

const int sz = 1e5 + 5;
pll a[sz];
long double f[sz];

long double dist(long double x, long double y, long double u, long double v){
    x = x - u;
    y = y - v;

    return sqrt(x*x + y*y);
}

long double bs(long double x, long double y, long double p){
    long double l = 0, r = 1e9;
    for(int i=1;i<60;++i){
        long double mid = (l + r) / 2;
        if(dist(x, y, p, mid) >= mid + y){
            l = mid;
        }
        else{
            r = mid;
        }
    }

    return (l + r) / 2;
}

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

//    freopen("main.inp","r",stdin);
//    freopen("main.out","w",stdout);

    int n;
    cin>>n;

    for(int i=1;i<=n;++i){
        cin >> a[i].first >> a[i].second;    
        f[i] = a[i].second;
        for(int j=i-1;j>=1;--j){
            f[i] = min(f[i], bs(a[j].first, f[j], a[i].first));
        }
        cout << fixed << setprecision(3) << f[i]<<endl;
    }
    return 0;
}

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