CF1704B.Luke is a Foodie
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题目描述
Luke likes to eat. There are n piles of food aligned in a straight line in front of him. The i-th pile contains ai units of food.
Luke will walk from the 1-st pile towards the n-th pile, and he wants to eat every pile of food without walking back. When Luke reaches the i-th pile, he can eat that pile if and only if ∣v−ai∣≤x, where x is a fixed integer, and v is Luke's food affinity.
Before Luke starts to walk, he can set v to any integer. Also, for each i (1≤i≤n), Luke can change his food affinity to any integer before he eats the i-th pile.
Find the minimum number of changes needed to eat every pile of food.
Note that the initial choice for v is not considered as a change.
卢克喜欢吃东西。他面前有一条直线上排列着 n 堆食物,其中第 i 堆含有 ai 单位的食物。
卢克将从第 1 堆出发,依次走向第 n 堆,并且他希望在不回头的情况下吃掉所有食物堆。当卢克到达第 i 堆时,他仅当满足 ∣v−ai∣≤x 时才能吃掉该堆食物,其中 x 是一个给定的固定整数,而 v 是卢克当前的食物亲和力(food affinity)。
在卢克开始行走前,他可以将 v 初始化为任意整数。此外,对每个 i(1≤i≤n),卢克可以在吃第 i 堆食物之前将他的食物亲和力 v 改为任意整数。
请找出吃掉所有食物堆所需的最少修改次数。
注意:初始设定 v 的值不计为一次修改。
输入格式
The input consists of multiple test cases. The first line contains a single integer t (1≤t≤104) — the number of test cases. The description of test cases follows.
For each test case, the first line contains two integers, n,x (1≤n≤2⋅105, 1≤x≤109) — the number of piles, and the maximum difference between the size of a pile and Luke's food affinity, such that Luke can eat the pile.
The second line contains n integers a1,a2,…,an (1≤ai≤109).
It is guaranteed that the sum of n over all test cases does not exceed 2⋅105.
输入包含多个测试用例。第一行包含一个整数 t(1≤t≤104),表示测试用例的数量。随后是各测试用例的描述。
对于每个测试用例,第一行包含两个整数 n 和 x(1≤n≤2⋅105,1≤x≤109)—— 分别表示堆的数量,以及 Luke 能吃掉某堆食物所允许的该堆大小与 Luke 的食物亲和力之间的最大差值。
第二行包含 n 个整数 a1,a2,…,an(1≤ai≤109)。
保证所有测试用例中 n 的总和不超过 2⋅105。
输出格式
For each test case, output an integer on a separate line, which is the minimum number of changes needed.
对于每个测试用例,在单独一行输出一个整数,表示所需的最少修改次数。
输入输出样例
输入#1
7 5 3 3 8 5 6 7 5 3 3 10 9 8 7 12 8 25 3 3 17 8 6 1 16 15 25 17 23 10 2 1 2 3 4 5 6 7 8 9 10 8 2 2 4 6 8 6 4 12 14 8 2 2 7 8 9 6 13 21 28 15 5 11 4 13 23 7 10 5 21 20 11 17 5 29 16 11
输出#1
0 1 2 1 2 4 6
说明/提示
In the first test case, Luke can set v to 5 before he starts to walk. And he can walk straight to eat every piles of food without changing v.
In the second test case, Luke can set v to 3 before he starts to walk. And he could change v to 10 before he eats the second pile. After that, he can walk straight to eat remaining food without changing v.
In the fourth test case, Luke can set v to 3 before he starts to walk. And he could change v to 8 before he eats the sixth pile. After that, he can walk straight to eat remaining food without changing v.
In the fifth test case, Luke can set v to 4 before he starts to walk. And he could change v to 6 before he eats the fourth pile. Then he could change v to 12 before he eats the seventh pile. After that, he can walk straight to eat remaining food without changing v.
在第一个测试用例中,Luke 可以在开始行走前将 v 设为 5,之后他可以保持 v 不变,沿直线行走并吃掉所有堆食物。
在第二个测试用例中,Luke 可以在开始行走前将 v 设为 3,并在吃第二堆食物前将 v 改为 10;此后,他可以保持 v 不变,沿直线行走并吃掉剩余的食物。
在第四个测试用例中,Luke 可以在开始行走前将 v 设为 3,并在吃第六堆食物前将 v 改为 8;此后,他可以保持 v 不变,沿直线行走并吃掉剩余的食物。
在第五个测试用例中,Luke 可以在开始行走前将 v 设为 4,并在吃第四堆食物前将 v 改为 6,再在吃第七堆食物前将 v 改为 12;此后,他可以保持 v 不变,沿直线行走并吃掉剩余的食物。
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