LeetCode-remove-duplicates-from-sorted-array-ii

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题目:

Follow up for "Remove Duplicates":
What if duplicates are allowed at most twice?

For example,
Given sorted array A =[1,1,1,2,2,3],

Your function should return length =5, and A is now[1,1,2,2,3].

题意:

remove-duplicates-from-sorted-array这题差不多,这是这里可以允许两个或两个一下的重复值

解题思路:

remove-duplicates-from-sorted-array的基础上,再加一个变量flag来判断出现了多少次的重复值,这里需要注意的是,要在前后数值不相等的时候,要将flag重置为1。当当前值和下一个值不相等是且flag小于3的时候,继续放入结果数组。

Java代码:

public static int removeDuplicates(int[] A) {
		if(A.length <= 0 || A == null) {
			 return 0;
		 }
		 
		 int count = 0;
		 
		 int flag = 1;
		 for(int i = 1 ; i < A.length; i++) {
			 if(A[count] != A[i]) {
				 
				 A[++count] = A[i];
				 flag = 1;
			 }	
			 else {
				 flag++;
				 if(flag < 3) {
					 A[++count] = A[i];
					
				 }
			 }
			 
		 }
		 
		 return count+1;	 
        
    }

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转载自blog.csdn.net/toward_south/article/details/89503484