https://colab.research.google.com/drive/1zN58t8BnhtHmS5PAqIut_eTTDgx4qLAY
https://colab.research.google.com/drive/1AxnZxXCHomdJr15vvGdhYd6DB6dWFhPC
https://colab.research.google.com/drive/1qXedJ0eo9kX2-DdkuZktlX4xHmObkG4V
https://colab.research.google.com/drive/1M4mOH-xoaaTRYKJGV_PlMBR3shrS_nr4
https://colab.research.google.com/drive/1W237EzfOcOLuEIcS5IIkKuaRxJFX9K6c
https://pastebin.com/FzwdsByC
http://cpp.sh/9qhak
https://pastebin.com/1f6n5uMX
http://cpp.sh/52ex3