Submission #1167158

#	Time	Username	Problem	Language	Result	Execution time	Memory
1167158		kiennguyendinh	Balloons (CEOI11_bal)	C++17	100 / 100	1429 ms	11388 KiB

bal

#include <bits/stdc++.h>
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2")
using namespace std;
struct ball{
    long double x,r;
};
ball a[200001];
long double res[200001];
int st[200001];
int to = 0;
void pu(int pos){
    st[++to] = pos;
}
void po(){
    to--;
}
int n;
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);cout.tie(0);
    cin >> n;
    for(int i = 1;i <= n;i++) cin >> a[i].x >> a[i].r;
    res[1] = a[1].r;
    pu(1);
    for(int i = 2;i <= n;i++){
        long double minn = a[i].r;
        for(int j = 1;j <= to;j++){
            minn = min(minn,(a[st[j]].x*a[st[j]].x - 2*a[i].x*a[st[j]].x + a[i].x*a[i].x)/(4*res[st[j]]));
        }
        res[i] = minn;
        while(to && res[i] >= res[st[to]]){
            po();
        }
        pu(i);
    }
    for(int i = 1;i <= n;i++){
        cout << fixed << setprecision(3) << res[i] << "\n";
    }
    return 0;
}

• 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