递推 1166：求f(x,n)

标签：10 1166 4.2 int include 递推 2.5

#include<iostream>
#include<cmath>
using namespace std;
int main(){
	float x,n,b=0;
	cin>>x>>n;
	b=sqrt(1+x);
	for(int i=2;i<=n;i++){
		b=sqrt(i+b);
	}
	cout<<b;
	
	
	
	return 0;
}

1166：求f(x,n)

时间限制: 1000 ms 内存限制: 65536 KB
提交数:35451 通过数: 23464

【题目描述】

已知

<span style="transition: none 0s ease 0s; display: inline-block; position: relative; border: 0px; padding: 0px; margin: 0px; vertical-align: 0px; line-height: normal; width: 25.553em; height: 0px; font-size: 20px;"><span style="transition: none 0s ease 0s; position: absolute; border: 0px; padding: 0px; margin: 0px; vertical-align: 0px; line-height: normal; clip: rect(0.302em, 1025.55em, 3.603em, -999.998em); top: -2.298em; left: 0em;"><span class="mi" id="MathJax-Span-3" style="transition: none 0s ease 0s; display: inline; position: static; border: 0px; padding: 0px; margin: 0px; vertical-align: 0px; line-height: normal; font-family: MathJax_Math-italic;">f<span style="transition: none 0s ease 0s; display: inline-block; position: static; border: 0px; padding: 0px; margin: 0px; vertical-align: 0px; line-height: normal; overflow: hidden; height: 1px; width: 0.053em;">(x,n)=n+(n−1)+(n−2)+...+2+1+x−−−−√−−−−−−−−−−−−−√−−−−−−−−−−−−−−−−−−−−−−√−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−√−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−√�(�,�)=�+(�−1)+(�−2)+...+2+1+�

计算<span style="transition: none 0s ease 0s; display: inline-block; position: relative; border: 0px; padding: 0px; margin: 0px; vertical-align: 0px; line-height: normal; width: 7.003em; height: 0px; font-size: 20px;"><span style="transition: none 0s ease 0s; position: absolute; border: 0px; padding: 0px; margin: 0px; vertical-align: 0px; line-height: normal; clip: rect(1.203em, 1006.95em, 2.502em, -999.998em); top: -2.147em; left: 0em;"><span class="mi" id="MathJax-Span-45" style="transition: none 0s ease 0s; display: inline; position: static; border: 0px; padding: 0px; margin: 0px; vertical-align: 0px; line-height: normal; font-family: MathJax_Math-italic;">x=4.2，n=10�=4.2，�=10以及<span style="transition: none 0s ease 0s; display: inline-block; position: relative; border: 0px; padding: 0px; margin: 0px; vertical-align: 0px; line-height: normal; width: 7.003em; height: 0px; font-size: 20px;"><span style="transition: none 0s ease 0s; position: absolute; border: 0px; padding: 0px; margin: 0px; vertical-align: 0px; line-height: normal; clip: rect(1.203em, 1006.95em, 2.502em, -999.998em); top: -2.147em; left: 0em;"><span class="mi" id="MathJax-Span-56" style="transition: none 0s ease 0s; display: inline; position: static; border: 0px; padding: 0px; margin: 0px; vertical-align: 0px; line-height: normal; font-family: MathJax_Math-italic;">x=2.5，n=15�=2.5，�=15时的<span style="transition: none 0s ease 0s; display: inline-block; position: relative; border: 0px; padding: 0px; margin: 0px; vertical-align: 0px; line-height: normal; width: 0.552em; height: 0px; font-size: 20px;"><span style="transition: none 0s ease 0s; position: absolute; border: 0px; padding: 0px; margin: 0px; vertical-align: 0px; line-height: normal; clip: rect(1.052em, 1000.55em, 2.252em, -999.998em); top: -1.898em; left: 0em;"><span class="mi" id="MathJax-Span-67" style="transition: none 0s ease 0s; display: inline; position: static; border: 0px; padding: 0px; margin: 0px; vertical-align: 0px; line-height: normal; font-family: MathJax_Math-italic;">f<span style="transition: none 0s ease 0s; display: inline-block; position: static; border: 0px; padding: 0px; margin: 0px; vertical-align: 0px; line-height: normal; overflow: hidden; height: 1px; width: 0.053em;">�的值。

【输入】

输入<span style="transition: none 0s ease 0s; display: inline-block; position: relative; border: 0px; padding: 0px; margin: 0px; vertical-align: 0px; line-height: normal; width: 0.552em; height: 0px; font-size: 20px;"><span style="transition: none 0s ease 0s; position: absolute; border: 0px; padding: 0px; margin: 0px; vertical-align: 0px; line-height: normal; clip: rect(1.302em, 1000.5em, 2.052em, -999.998em); top: -1.898em; left: 0em;"><span class="mi" id="MathJax-Span-70" style="transition: none 0s ease 0s; display: inline; position: static; border: 0px; padding: 0px; margin: 0px; vertical-align: 0px; line-height: normal; font-family: MathJax_Math-italic;">x�和<span style="transition: none 0s ease 0s; display: inline-block; position: relative; border: 0px; padding: 0px; margin: 0px; vertical-align: 0px; line-height: normal; width: 0.603em; height: 0px; font-size: 20px;"><span style="transition: none 0s ease 0s; position: absolute; border: 0px; padding: 0px; margin: 0px; vertical-align: 0px; line-height: normal; clip: rect(1.302em, 1000.6em, 2.052em, -999.998em); top: -1.898em; left: 0em;"><span class="mi" id="MathJax-Span-73" style="transition: none 0s ease 0s; display: inline; position: static; border: 0px; padding: 0px; margin: 0px; vertical-align: 0px; line-height: normal; font-family: MathJax_Math-italic;">n�。

【输出】

函数值，保留两位小数。

【输入样例】

4.2 10

【输出样例】

3.68

提交统计信息

标签：10,1166,4.2,int,include,递推,2.5
From： https://www.cnblogs.com/wangyueshuo/p/18105017