268. Missing Number

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題目敘述

Given an array nums containing n distinct numbers in the range [0, n], return the only number in the range that is missing from the array.

Example 1

Input: nums = [3,0,1] Output: 2 Explanation: n = 3 since there are 3 numbers, so all numbers are in the range [0,3]. 2 is the missing number in the range since it does not appear in nums.

Example 2

Input: nums = [0,1] Output: 2 Explanation: n = 2 since there are 2 numbers, so all numbers are in the range [0,2]. 2 is the missing number in the range since it does not appear in nums.

Example 3

Input: nums = [9,6,4,2,3,5,7,0,1] Output: 8 Explanation: n = 9 since there are 9 numbers, so all numbers are in the range [0,9]. 8 is the missing number in the range since it does not appear in nums.

解題思路

Solution

import java.util.Arrays;

class Solution {
    public int missingNumber(int[] nums) {
        Arrays.sort(nums);

        for(int i = 0; i < nums.length; i++){
            if(i != nums[i]) return i;
        }

        return nums.length;
    }
}