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leetcode-problemset/leetcode-cn/problem (Chinese)/早餐组合 [2vYnGI].md

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小扣在秋日市集选择了一家早餐摊位,一维整型数组 `staple` 中记录了每种主食的价格,一维整型数组 `drinks` 中记录了每种饮料的价格。小扣的计划选择一份主食和一款饮料,且花费不超过 `x` 元。请返回小扣共有多少种购买方案。
注意:答案需要以 `1e9 + 7 (1000000007)` 为底取模,如:计算初始结果为:`1000000008`,请返回 `1`
**示例 1**
>输入:`staple = [10,20,5], drinks = [5,5,2], x = 15`
>
>输出:`6`
>
>解释:小扣有 6 种购买方案,所选主食与所选饮料在数组中对应的下标分别是:
>第 1 种方案staple[0] + drinks[0] = 10 + 5 = 15
>第 2 种方案staple[0] + drinks[1] = 10 + 5 = 15
>第 3 种方案staple[0] + drinks[2] = 10 + 2 = 12
>第 4 种方案staple[2] + drinks[0] = 5 + 5 = 10
>第 5 种方案staple[2] + drinks[1] = 5 + 5 = 10
>第 6 种方案staple[2] + drinks[2] = 5 + 2 = 7。
**示例 2**
>输入:`staple = [2,1,1], drinks = [8,9,5,1], x = 9`
>
>输出:`8`
>
>解释:小扣有 8 种购买方案,所选主食与所选饮料在数组中对应的下标分别是:
>第 1 种方案staple[0] + drinks[2] = 2 + 5 = 7
>第 2 种方案staple[0] + drinks[3] = 2 + 1 = 3
>第 3 种方案staple[1] + drinks[0] = 1 + 8 = 9
>第 4 种方案staple[1] + drinks[2] = 1 + 5 = 6
>第 5 种方案staple[1] + drinks[3] = 1 + 1 = 2
>第 6 种方案staple[2] + drinks[0] = 1 + 8 = 9
>第 7 种方案staple[2] + drinks[2] = 1 + 5 = 6
>第 8 种方案staple[2] + drinks[3] = 1 + 1 = 2
**提示:**
+ `1 <= staple.length <= 10^5`
+ `1 <= drinks.length <= 10^5`
+ `1 <= staple[i],drinks[i] <= 10^5`
+ `1 <= x <= 2*10^5`