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c_cpp
2 months ago
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#include <iostream> #include <vector> #include <algorithm> using real=long double; constexpr int L=1e6+1; int main() { int T=1; //std::cin >> T; std::vector<real> H(L); for(int i=1;i<=L;i++) H[i]=H[i-1]+1.0/i; while(T--) { int n,m; std::cin >> n >> m; std::cout << std::fixed; std::cout.precision(4); std::cout << n*(H[n]-H[n-m]) << '\n'; } }
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