【朱迪的LeetCode刷题笔记】26. Remove Duplicates from Sorted Array #Easy #C #C++

Judie

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2. 26. Remove Duplicates from Sorted Array
   
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5. Given a sorted array nums, remove the duplicates in-place such that each element appears only once and returns the new length.
   
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7. Do not allocate extra space for another array, you must do this by modifying the input array in-place with O(1) extra memory.
   
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10. Clarification:
    
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12. Confused why the returned value is an integer but your answer is an array?
    
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14. 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.
    
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16. Internally you can think of this:
    
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18. // nums is passed in by reference. (i.e., without making a copy)
    
19. int len = removeDuplicates(nums);
    
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21. // any modification to nums in your function would be known by the caller.
    
22. // using the length returned by your function, it prints the first len elements.
    
23. for (int i = 0; i < len; i++) {
    
24.     print(nums[i]);
    
25. }
    
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28. Example 1:
    
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30. Input: nums = [1,1,2]
    
31. Output: 2, nums = [1,2]
    
32. 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.
    
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34. Example 2:
    
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36. Input: nums = [0,0,1,1,1,2,2,3,3,4]
    
37. Output: 5, nums = [0,1,2,3,4]
    
38. Explanation: Your function should return length = 5, with the first five elements of nums being modified to 0, 1, 2, 3, and 4 respectively. It doesn't matter what values are set beyond the returned length.
    
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41. Constraints:
    
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43. 0 <= nums.length <= 3 * 104
    
44. -104 <= nums[i] <= 104
    
45. nums is sorted in ascending order.
    

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