题意:求f(n)=1/1+1/2+1/3+1/4-1/n   (1 ≤ n ≤ 108).,精确到10-8    (原题在文末) 知识点:      调和级数(即f(n))至今没有一个完全正确的公式,但欧拉给出过一个近似公式:(n很大时)       f(n)≈ln(n)+C+1/2*n       欧拉常数值:C≈0.57721566490153286060651209       c++ math库中,log即为ln. 题解: 公式:f(n)=ln(n)+C+1/(2*n); n很小时直接求…

In mathematics, the nth harmonic number is the sum of the reciprocals of the first n natural numbers: In this problem, you are given n, you have to find Hn. Input Input starts with an integer T (≤ 10000), denoting the number of test cases. Each case…

题目链接:http://lightoj.com/volume_showproblem.php?problem=1234 Sample Input Sample Output Case : Case : 1.5 Case : 1.8333333333 Case : 2.0833333333 Case : 2.2833333333 Case : 2.450 Case : 2.5928571429 Case : 2.7178571429 Case : 2.8289682540 Case : 18.89…

In mathematics, the nth harmonic number is the sum of the reciprocals of the first n natural numbers: In this problem, you are given n, you have to find Hn. InputInput starts with an integer T (≤ 10000), denoting the number of test cases. Each case s…

Harmonic Number In mathematics, the nth harmonic number is the sum of the reciprocals of the first n natural numbers: In this problem, you are given n, you have to find Hn. Input Input starts with an integer T (≤ 10000), denoting the number of test c…

/** 题目:Harmonic Number 链接:https://vjudge.net/contest/154246#problem/I 题意:求Hn: Hn = 1 + 1/2 + 1/3 + ... + 1/n; (n<=1e8) T<=1e4; 精确到1e-8: 思路:由于1e8,所以直接存表不行. 通过每100个存入数组一个变量值.然后每次查询最多100次就可以了. 其他解法转自http://www.cnblogs.com/shentr/p/5296462.html: 知识点: 调和…

题解:隔一段数字存一个答案,在查询时,只要找到距离n最近而且小于n的存答案值,再把剩余的暴力跑一遍就可以. #include <bits/stdc++.h> using namespace std; const int N = 1e8 + 10; const int M = 2e6 + 10; double a[M]; void Init() { a[0] = 0.0; double ans = 1; for( int i = 2; i < N; i ++) { ans += 1.0 /…

Harmonic Number In mathematics, the nth harmonic number is the sum of the reciprocals of the first n natural numbers: In this problem, you are given n, you have to find Hn. Input Input starts with an integer T (≤ 10000), denoting the number of test c…

http://lightoj.com/volume_showproblem.php?problem=1234 Harmonic Number Time Limit:3000MS     Memory Limit:32768KB     64bit IO Format:%lld & %llu Submit Status Practice LightOJ 1234 Description In mathematics, the nth harmonic number is the sum of th…

D - Harmonic Number Time Limit:3000MS     Memory Limit:32768KB     64bit IO Format:%lld & %llu Submit Status Practice LightOJ 1234 Description In mathematics, the nth harmonic number is the sum of the reciprocals of the first n natural numbers: In th…