public int Area(int[] height,int sta,int end){
        if(sta > end){
            return 0;
        }else{
            int minIndex = minHeight(height,sta,end);
            int areaT = (end-sta+1)* height[minIndex];
            int areaL = Area(height,sta,minIndex-1);
            int areaR = Area(height,minIndex+1,end);
            return Math.max(Math.max(areaL, areaR),areaT);
        }
    }