题目链接：1144 The Missing Number (20 point(s))

Description

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 (≤10​5​​). Then N integers are given in the next line, separated by spaces. All the numbers are in the range of int.

Output Specification

Print in a line the smallest positive integer that is missing from the input list.

Sample Input

10

5 -25 9 6 1 3 4 2 5 17

Sample Output

7

分析

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