I had contributed 4 problems to LC in Spring 2018. The problems were asked by Google (Software Engineer, ML), Amazon (ML Scientist), and Facebook (Software Engineer, ML) during phone screen. For some reason LC decided to reject the problems. Here are the problems:\n\n**Google**\n\n![image](https://assets.leetcode.com/users/ankoor/image_1591858824.png)\n\n**Amazon**\n\n![image](https://assets.leetcode.com/users/ankoor/image_1591858849.png)\n\n**Facebook**\n\n![image](https://assets.leetcode.com/users/ankoor/image_1591858880.png)\n\n![image](https://assets.leetcode.com/users/ankoor/image_1591858891.png)\n\n\n\n

I had contributed 4 problems to LC in Spring 2018. The problems were asked by Google (Software Engineer, ML), Amazon (ML Scientist), and Facebook (Software Engi