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- #include <bits/stdc++.h>
- using namespace std;
- typedef long long LL;
- float fun(int n){
- float k = 1;
- float sum = 0;
- for (int i = 2; i <= n; i++){
- sum += 1 / k;
- k += i;
- }
- return sum;
- }
- int main()
- {
- float s = fun(50);
- printf("%.2f", s);
- return 0;
- }
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