"Damn Single (单身狗)" is the Chinese nickname for someone who is being single. You are supposed to find those who are alone in a big party, so they can be taken care of. Input Specification: Each input file contains one test case. For each case,…
John got a full mark on PAT. He was so happy that he decided to hold a raffle(抽奖) for his followers on Weibo -- that is, he would select winners from every N followers who forwarded his post, and give away gifts. Now you are suppose…
Consider a positive integer N written in standard notation with k1 digits ai as ak⋯a1a0 with 0 for all i and ak>0. Then N is palindromic if and only if aiak−i for all i. Zero is written 0 and is also palindrom…
Given N integers, you are supposed to find the smallest positive integer that is NOT in the given list. Input Specification: Each input file contains one test case. For each case, the first line gives a positive integer N (≤105). Then N integers are…