城市轮廓线：



输入文件：input1.dat



第一行为建筑个数



之后每行格式为三个数x1 h x2，其中x1,x2是建筑的开始和结束坐标 h是建筑的高度

输出最后轮廓-Urban contour line: the input file: input1.dat first acts after the building number format for each line number 3 x1 h x2, where x1, x2 is the beginning and end coordinates of the construction h is the height of the construction output of the final profile