#include <generator>
#include <print>
#include <tuple>

using Triple = std::tuple<int,int,int>;

std::generator<Triple> pythagorean()
{
  for (int c = 1; c < 20; ++c)
    for (int b = 1; b < c; ++b)
      for (int a = 1; a < b; ++a)
        if (a*a + b*b == c*c)
          co_yield {a,b,c};
}

int main()
{
  for (auto [a,b,c] : pythagorean())
  {
    std::println("{}²+{}²={}²", a,b,c);
  }
}