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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.
Follow up: Could you implement a solution using only O(1)
extra space complexity and O(n)
runtime complexity?
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.
Example 4:
Input: nums = [0] Output: 1 Explanation: n = 1 since there is 1 number, so all numbers are in the range [0,1]. 1 is the missing number in the range since it does not appear in nums.
Constraints:
n == nums.length
1 <= n <= 104
0 <= nums[i] <= n
nums
are unique.class Solution:
def missingNumber(self, nums: List[int]) -> int:
res = len(nums)
for i, v in enumerate(nums):
res ^= (i ^ v)
return res
class Solution {
public int missingNumber(int[] nums) {
int res = nums.length;
for (int i = 0, n = res; i < n; ++i) {
res ^= (i ^ nums[i]);
}
return res;
}
}
class Solution {
public int missingNumber(int[] nums) {
int res = nums.length;
for (int i = 0, n = res; i < n; ++i) {
res += (i - nums[i]);
}
return res;
}
}
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