阶梯倍投最佳方案

简介：Another day, Su Can woke up and saw birds chirping outside the window. She thought about what kind of birds were not afraid of dying and would not go to the north this season. She got up in her pajamas and took a look. It turned out that a woman from the next door family bought a parrot. It was a colorful parrot. The parrot was jumping around in the cage on the balcony, chirping annoyingly.