Submission #767278

#	Time	Username	Problem	Language	Result	Execution time	Memory
767278		Alora	Balloons (CEOI11_bal)	C++17	40 / 100	125 ms	4288 KiB

bal

#include <bits/stdc++.h>
#define name "cownav"
#define fi(i,a,b) for(int i = a; i <= b; i++)
#define fid(i,a,b) for(int i = a; i >= b; i--)
#define ll long long
#define f first
#define se second
#define pii pair<int, int>
#define getbit(i, j) ((i >> j) & 1)
#define pb push_back
#define all(v) v.begin(), v.end()
#define maxn 200005
const int M = 1e9 + 7;
using namespace std;
int n, x[maxn], top, q[maxn];
double r[maxn];

void sub1(){
    fi(i, 2, n){
        fi(j, 1, i - 1){
            ll A = 1ll*(x[i] - x[j])*(x[i] - x[j]);
            double _r = A/(4*r[j]);
            r[i] = min(r[i], _r);
        }
    }
    fi(i, 1, n) cout << fixed << setprecision(3) << r[i] << '\n';
    exit(0);
}

double radius(int a, int b, double c){
    ll A = 1ll*(a - b)*(a - b);
    return A/(4*c);
}

signed main(){
	ios_base::sync_with_stdio(0);
	cin.tie(NULL);
 //   freopen(name".in", "r", stdin);
   // freopen(name".out", "w", stdout);
    cin >> n;
    fi(i, 1, n) cin >> x[i] >> r[i];
    if(n <= 2000) sub1();
    top = 1; q[1] = 1;
    fi(i, 2, n){
        while(top > 0 && radius(x[q[top]], x[i], r[q[top]]) < r[i]){
            r[i] = min(r[i], radius(x[q[top]], x[i], r[q[top]]));
            top--;
        }
        q[++top] = i;
    }
    fi(i, 1, n) cout << fixed << setprecision(3) << r[i] << '\n';

}

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