2.7我的第十四篇

题目链接：https://acs.jxnu.edu.cn/problem/CF15A

题目：Cottage Village

描述：

A new cottage village called «Flatville» is being built in Flatland. By now they have already built in «Flatville» n square houses with the centres on the Оx-axis. The houses' sides are parallel to the coordinate axes. It's known that no two houses overlap, but they can touch each other.

The architect bureau, where Peter works, was commissioned to build a new house in «Flatville». The customer wants his future house to be on the Оx-axis, to be square in shape, have a side t, and touch at least one of the already built houses. For sure, its sides should be parallel to the coordinate axes, its centre should be on the Ox-axis and it shouldn't overlap any of the houses in the village.

Peter was given a list of all the houses in «Flatville». Would you help him find the amount of possible positions of the new house?

输入：

The first line of the input data contains numbers n and t (1 ≤ n, t ≤ 1000). Then there follow n lines, each of them contains two space-separated integer numbers: xi ai, where xi — x-coordinate of the centre of the i-th house, and ai — length of its side ( - 1000 ≤ xi ≤ 1000, 1 ≤ ai ≤ 1000).

输出：

Output the amount of possible positions of the new house.

我的翻译：在x轴上有n个正方形房子，你也要建一个新房子。你的房子至少要 挨到一个房子但不能与房子重合，给你房子的侧面积，请你找到最适合的位置。

输入：第一行为房子的个数n以及你的房子侧面大小t，接下来的n行，第一个为房子侧面位置，第二个为侧面大小。

输出：房子的位置。

标签：house,房子,houses,第十四,new,Flatville,2.7,1000
来源： https://blog.csdn.net/WycRs/article/details/122805288