题解 | #牛牛学数列3#
牛牛学数列3
https://ac.nowcoder.com/acm/problem/22158
#include<bits/stdc++.h> using namespace std; int main() { int n; cin>>n; double sum=0; int s=1; for(int i=1;i<=n;i++) { sum+=1.0/i*s; s=-s; } printf("%.3lf",sum); }
牛牛学数列3
https://ac.nowcoder.com/acm/problem/22158
#include<bits/stdc++.h> using namespace std; int main() { int n; cin>>n; double sum=0; int s=1; for(int i=1;i<=n;i++) { sum+=1.0/i*s; s=-s; } printf("%.3lf",sum); }
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