Function test

code/other/floyds_algorithm.test.cpp:8–16

}

void test() {
  for (int i = 0; i < 20; i++) {
    for (m = 1; m < 20; m++) {
      ii res = find_cycle(-i, f1);
      assert_equal(res.first, i);
      assert_equal(res.second, m);
    }
  }
}
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