Question

Write a function that takes an integer array and returns the smallest missing positive number?
function solve( a ){ //write your code here }
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Input: [2, 3, 5, 7, 6, 6, 7, 11, 3]
Output: 1

Input: [4, 2, 4, 3, 4, 1]
Output: 5

Input: [2, 2, 3, 9, 1, 8, 8]
Output: 4