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add leetcode problem-cn part2

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2022-03-27 20:38:29 +08:00
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小力将 N 个零件的报价存于数组 `nums`。小力预算为 `target`,假定小力仅购买两个零件,要求购买零件的花费不超过预算,请问他有多少种采购方案。
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:`nums = [2,5,3,5], target = 6`
>
>输出:`1`
>
>解释:预算内仅能购买 nums[0] 与 nums[2]。
**示例 2**
>输入:`nums = [2,2,1,9], target = 10`
>
>输出:`4`
>
>解释:符合预算的采购方案如下:
>nums[0] + nums[1] = 4
>nums[0] + nums[2] = 3
>nums[1] + nums[2] = 3
>nums[2] + nums[3] = 10
**提示:**
- `2 <= nums.length <= 10^5`
- `1 <= nums[i], target <= 10^5`