1144. 递减元素使数组呈锯齿状(两次扫）

1144. 递减元素使数组呈锯齿状

class Solution {
public:
    int movesToMakeZigzag(vector<int>& nums) {
        int ji=0;
        int n=nums.size();
        if(n==1)
            return 0;
        if(n==2&&nums[0]!=nums[1])
            return 0;
        if(n==2&&nums[0]==nums[1])
            return 1;
        int bb[1005];
        for(int i=0;i<n;i++)
            bb[i]=nums[i];
        for(int i=1;i<n;i+=2)
        {
            if(nums[i]<=nums[i-1])
                ji+=abs(nums[i]-nums[i-1]-1);
            if(i!=n-1&&nums[i]<=nums[i+1])
                {
                        ji+=abs(nums[i]-nums[i+1]-1);
                        nums[i+1]=nums[i]-1;
                }
        }
        int ou=0;
        for(int i=0;i<n;i+=2)
        {
            if(i==0)
            {
               
                if(bb[i]<=bb[i+1])
                    {
                        ou+=abs(bb[i]-bb[i+1]-1);
                        bb[i+1]=bb[i]-1;
                    }
            }
            else
            {
                if(bb[i]<=bb[i-1])
                    ou+=abs(bb[i]-bb[i-1]-1);
                if(i!=n-1&&bb[i]<=bb[i+1])
                    {
                        ou+=abs(bb[i]-bb[i+1]-1);
                        bb[i+1]=bb[i]-1;
                    }
            }
        } 
        int ans=min(ji,ou);
        return ans;
    }
};