34 lines
438 B
C++
34 lines
438 B
C++
#pragma once
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#define EXERCISM_RUN_ALL_TESTS
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namespace squares {
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namespace detail {
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constexpr unsigned sum(unsigned n)
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{
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return (n*(n+1))/2;
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}
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}
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constexpr unsigned square_of_sums(unsigned n)
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{
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using detail::sum;
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return sum(n)*sum(n);
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}
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constexpr unsigned sum_of_squares(unsigned n)
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{
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return (n*(n+1)*(2*n+1))/6;
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}
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constexpr unsigned difference(unsigned n)
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{
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return square_of_sums(n) - sum_of_squares(n);
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}
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}
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