LeetCode——Remove Duplicates from Sorted Array

Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length.

Do not allocate extra space for another array, you must do this in place with constant memory.

For example,

Given input array A = [1,1,2],

Your function should return length = 2, and A is now [1,2].

给定一个排好序的数组,删除其中的重复元素,使每个元素只出现一次,并返回新的长度。

不要分配新的空间给新数组,你必须使用常数时间完成。

例如:

给定输入数组 A = [1,1,2]

你的函数需要返回 长度=2 ,现在的A是 [1,2]

如下代码采用的方法是前后元素互相比较,若有不相等,则更新原数组,其中 j 指向的是出现一次的数。

	public static int removeDuplicates(int[] A) {
		int len = A.length;
		if(len <= 0)
			return -1;
		int j = 0;
		for(int i=1;i<len;i++){
			if(A[j] == A[i])
				continue;
			else
				A[++j] = A[i];
		}
		return j+1;
	}

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时间: 2025-01-21 07:44:07

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