This problem was asked by Microsoft.
- A number is considered perfect if its digits sum up to exactly 10.
- Given a positive integer n, return the n-th perfect number.
For example, given 1, you should return 19. Given 2, you should return 28.
- This is one of the problem where you can scratch your head for hours, trying to come up with a "smart" solution but just can't. Unfortunately, it doesn't seem like there's a faster way than simply iterating over all the numbers and keeping track of the current perfect number until we hit n.
- [Daily Coding Problem 70] Nth perfect number
来源: http://www.bubuko.com/infodetail-2945831.html