题解 | 牛牛学数列2
牛牛学数列2
https://www.nowcoder.com/practice/fc72951f52984f3abd286d82eeffacba
#include <iostream>
#include <iomanip>
using namespace std;
int main() {
int n;
cin >> n;
double sum = 0;
for (int i = 1; i<= n; ++i) { // 注意 while 处理多个 case
sum += 1.0/i;
}
cout << fixed << setprecision(6) << sum << endl;
}
// 64 位输出请用 printf("%lld")
