CF992D.Nastya and a Game
提高+/省选-
通过率:0%
时间限制:2.00s
内存限制:256MB
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题目描述
Nastya received one more array on her birthday, this array can be used to play a traditional Byteland game on it. However, to play the game the players should first select such a subsegment of the array that
, where p is the product of all integers on the given array, s is their sum, and k is a given constant for all subsegments.
Nastya wonders how many subsegments of the array fit the described conditions. A subsegment of an array is several consecutive integers of the array.
娜斯佳生日时又收到了一个数组,这个数组可用于在拜特兰德(Byteland)传统游戏中进行操作。然而,要进行游戏,玩家首先需要选择该数组的一个子段,使得满足条件:
,其中 p 是该子段中所有整数的乘积,s 是它们的和,而 k 是对所有子段给定的常数。
娜斯佳想知道,该数组中有多少个子段满足上述条件。数组的一个子段是指数组中若干连续的整数。
输入格式
The first line contains two integers n and k (1 ≤ n ≤ 2·105, 1 ≤ k ≤ 105), where n is the length of the array and k is the constant described above.
The second line contains n integers _a_1, _a_2, ..., a__n (1 ≤ a__i ≤ 108) — the elements of the array.
第一行包含两个整数 n 和 k(1≤n≤2⋅105,1≤k≤105),其中 n 表示数组的长度,k 是上述描述的常数。
第二行包含 n 个整数 a1, a2, …, an(1≤ai≤108)—— 数组的元素。
输出格式
In the only line print the number of subsegments such that the ratio between the product and the sum on them is equal to k.
在唯一的一行中输出满足其上乘积与和的比值等于 k 的子段数量。
输入输出样例
输入#1
1 1 1
输出#1
1
输入#2
4 2 6 3 8 1
输出#2
2
说明/提示
In the first example the only subsegment is [1]. The sum equals 1, the product equals 1, so it suits us because
.
There are two suitable subsegments in the second example — [6, 3] and [3, 8, 1]. Subsegment [6, 3] has sum 9 and product 18, so it suits us because
. Subsegment [3, 8, 1] has sum 12 and product 24, so it suits us because
.
在第一个例子中,唯一的子段是 [1]。其和为 1,积为 1,因此满足条件,因为
。
在第二个例子中有两个满足条件的子段:[6, 3] 和 [3, 8, 1]。子段 [6, 3] 的和为 9,积为 18,因此满足条件,因为
。子段 [3, 8, 1] 的和为 12,积为 24,因此满足条件,因为
。
输入解题思路,AI测评打分。不知道怎么写?