摘要：
Given an array nums containing n + 1 integers where each integer is between 1 and n (inclusive), prove that at least one duplicate number must exist. 阅读全文
摘要：
Giving a string with number from 1 to n in random order, but miss 1 number.Find that number. You can assume n <= 30 Giving a string with number from 1 阅读全文
摘要：
Given an array contains N numbers of 0 .. N, find which number doesn't exist in the array. Given an array contains N numbers of 0 .. N, find which num 阅读全文
摘要：
Given an unsorted integer array, find the first missing positive integer. Given an unsorted integer array, find the first missing positive integer. Gi 阅读全文