数组中第三大的数 leetcode 414

数组中第三大的数：

class Solution {
    public int thirdMax(int[] nums) {
        int len = nums.length;
        int max = nums[0];
        int center = nums[0];
        int min = nums[0];
        int swp;
        int[] third = new int[3];
        int k= 0;
        boolean flag = false;
        for(int i=1;i<len;++i){
            if(nums[i]!=max&&!flag){
                center = nums[i];
                if(center>max){
                    swp = max;
                    max = center;
                    center = swp;
                }
                flag = true;
            }else if(nums[i]!=max&&nums[i]!=center&&flag){
                min = nums[i];
                if(min>max){
                    swp = max;
                    max = min;
                    min = center;
                    center = swp;
                }else if(min>center){
                    swp = center;
                    center = min;
                    min = swp;
                }else{
                    
                }
                k = i+1;
                break;
            }else{
                
            }
        }
        if(k!=0){
            for(int i=k;i<len;++i){
                if(nums[i]<=min||nums[i]==center||nums[i]==max){
                    
                }else if(nums[i]>max){
                    swp = max;
                    max = nums[i];
                    min = center;
                    center = swp;
                }else if(nums[i]>center){
                    swp = center;
                    center = nums[i];
                    min = swp;
                }else{
                    min = nums[i];
                }
            }
            return min;
        }else{
            return max;
        }
    }
}