[릿코드, Leetcode] [JAVA] Remove Duplicates from Sorted Array

Remove Duplicates from Sorted Array - LeetCode

Leetcode - Remove Duplicates from Sorted Array

설명

Given a sorted array nums, remove the duplicates in-place such that each element appears only once and returns the new length.

Do not allocate extra space for another array, you must do this by modifying the input array in-place with O(1) extra memory.

Clarification:

Confused why the returned value is an integer but your answer is an array?

Note that the input array is passed in by reference, which means a modification to the input array will be known to the caller as well.

Internally you can think of this:

// nums is passed in by reference. (i.e., without making a copy)
int len = removeDuplicates(nums);

// any modification to nums in your function would be known by the caller.
// using the length returned by your function, it prints the first len elements.
for (int i = 0; i < len; i++) {
    print(nums[i]);
}

 

Example:

Input: nums = [1,1,2]

Output: 2, nums = [1,2]

Explanation: Your function should return length = 2, with the first two elements of nums being 1 and 2 respectively. It doesn't matter what you leave beyond the returned length.

제한사항

• nums is sorted in ascending order.

 

소스코드

class Solution {
    public int removeDuplicates(int[] nums) {
        int index = 1;
        for (int i=0; i<nums.length - 1; i++) {
            if (nums[i] != nums[i+1]) {
                nums[index++] = nums[i + 1];
            }
        }
        
        return index;
    }
}

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