接雨水-入参为ArrayList＜Integer＞类型

Posted 2022-10-15 王六六同学

/**
 * @author WanZi
 * @create 2022-10-13 18:17
 */
public class Main03 

    public int Trap (ArrayList<Integer> height) 
        // write code here
        int res = 0;
        for(int i=0;i<height.size();i++)
            if(i == 0 || i == height.size() - 1)
                continue;
            
            int l = height.get(i);
            int r = height.get(i);

            for(int rr = i+1;rr<height.size();rr++)
                if(height.get(rr)>r)
                    r = height.get(rr);
                

            

            for(int ll = i-1;ll>=0;ll--)
                if(height.get(ll)>l)
                    l = height.get(ll);
                

            

            int h = Math.min(l,r) - height.get(i);
            if(h > 0)
                res += h;
            
        
        return res;