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#include <iostream> double exp(const int &i, const int &n, unsigned f = 1) { return i == 1 ? 2 + exp(i + 1, n, f) : (i < n ? 1.0 / (f * i) + exp(i + 1, n, f * i) : 0); } int main() { printf("E=%.4f", exp(1, 10)); }
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