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原题链接：4798.讨论组（仅限本组人员）
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zhouty

秩序白银

2023-08-14 15:58:35

发布于：广东

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#include <bits/stdc++.h>

using namespace std;

double f(double x, double epsilon = 1e-6) {
    if (x == 0 || x == 1) {
        return x;
    }
    
    double left = 0, right = x;
    while (right - left > epsilon) {
        double mid = (left + right) / 2;
        double square = mid * mid;
        
        if (square > x) {
            right = mid;
        } else {
            left = mid;
        }
    }
    double ans = (left + right) / 2;
    if(ans>0) return ans;
    else return -1;
}

int main() {
    double number;
    cin >> number;
	double result = f(number);
    if(result!=-1) printf("%.5lf", result);
    else cout<<-1;
	return 0;
}
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