Palo Alto unusual city endless coordinate line it know office Lyft Level 5Lyft popular m taxi driver city day transport rest city resident n ridersEach resident include taxi driver PaloAlto live unique location pair resident coordinate sameThe Lyft system clever rider call taxi taxi driver close person if multiple one distance taxi driver small coordinate selectedbut morning taxi driver wonder rider give taxi driver order taxi day in word need find taxi driver number a_i number rider ith taxi driver driver rider homethe taxi driver transport taxi driver