The wrong with "Find the Duplicate Number"

  • 0

    In this question, I use

    public class Solution {
        public int findDuplicate(int[] nums) {
            int a[] =new int[nums.length-1];
    for(int i=0;i<nums.length;i++){
    			a[nums[i]-1] +=1;
    					return nums[i];
        	return 0;

    this function and pass the exam.But,the extra space is not O(1).

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