問題:http://codeforces.com/contest/27/problem/A
本番は10分しか時間なくて問題読まずに提出したらHackされ0点.
import java.util.BitSet; import java.util.Scanner; public class A_NextTest { public static void main(String[] args) { Scanner s = new Scanner(System.in); BitSet set = new BitSet(); for (int i = 0, n = s.nextInt(); i < n; ++i) { set.set(s.nextInt()); } System.out.println(set.nextClearBit(1)); } }