{ "data": { "question": { "questionId": "2358", "questionFrontendId": "2270", "categoryTitle": "Algorithms", "boundTopicId": 1487682, "title": "Number of Ways to Split Array", "titleSlug": "number-of-ways-to-split-array", "content": "
You are given a 0-indexed integer array nums
of length n
.
nums
contains a valid split at index i
if the following are true:
i + 1
elements is greater than or equal to the sum of the last n - i - 1
elements.i
. That is, 0 <= i < n - 1
.Return the number of valid splits in nums
.
\n
Example 1:
\n\n\nInput: nums = [10,4,-8,7]\nOutput: 2\nExplanation: \nThere are three ways of splitting nums into two non-empty parts:\n- Split nums at index 0. Then, the first part is [10], and its sum is 10. The second part is [4,-8,7], and its sum is 3. Since 10 >= 3, i = 0 is a valid split.\n- Split nums at index 1. Then, the first part is [10,4], and its sum is 14. The second part is [-8,7], and its sum is -1. Since 14 >= -1, i = 1 is a valid split.\n- Split nums at index 2. Then, the first part is [10,4,-8], and its sum is 6. The second part is [7], and its sum is 7. Since 6 < 7, i = 2 is not a valid split.\nThus, the number of valid splits in nums is 2.\n\n\n
Example 2:
\n\n\nInput: nums = [2,3,1,0]\nOutput: 2\nExplanation: \nThere are two valid splits in nums:\n- Split nums at index 1. Then, the first part is [2,3], and its sum is 5. The second part is [1,0], and its sum is 1. Since 5 >= 1, i = 1 is a valid split. \n- Split nums at index 2. Then, the first part is [2,3,1], and its sum is 6. The second part is [0], and its sum is 0. Since 6 >= 0, i = 2 is a valid split.\n\n\n
\n
Constraints:
\n\n2 <= nums.length <= 105
-105 <= nums[i] <= 105
给你一个下标从 0 开始长度为 n
的整数数组 nums
。
\n如果以下描述为真,那么 nums
在下标 i
处有一个 合法的分割 :
i + 1
个元素的和 大于等于 剩下的 n - i - 1
个元素的和。i
的右边 至少有一个 元素,也就是说下标 i
满足 0 <= i < n - 1
。请你返回 nums
中的 合法分割 方案数。
\n\n
示例 1:
\n\n\n输入:nums = [10,4,-8,7]\n输出:2\n解释:\n总共有 3 种不同的方案可以将 nums 分割成两个非空的部分:\n- 在下标 0 处分割 nums 。那么第一部分为 [10] ,和为 10 。第二部分为 [4,-8,7] ,和为 3 。因为 10 >= 3 ,所以 i = 0 是一个合法的分割。\n- 在下标 1 处分割 nums 。那么第一部分为 [10,4] ,和为 14 。第二部分为 [-8,7] ,和为 -1 。因为 14 >= -1 ,所以 i = 1 是一个合法的分割。\n- 在下标 2 处分割 nums 。那么第一部分为 [10,4,-8] ,和为 6 。第二部分为 [7] ,和为 7 。因为 6 < 7 ,所以 i = 2 不是一个合法的分割。\n所以 nums 中总共合法分割方案受为 2 。\n\n\n
示例 2:
\n\n\n输入:nums = [2,3,1,0]\n输出:2\n解释:\n总共有 2 种 nums 的合法分割:\n- 在下标 1 处分割 nums 。那么第一部分为 [2,3] ,和为 5 。第二部分为 [1,0] ,和为 1 。因为 5 >= 1 ,所以 i = 1 是一个合法的分割。\n- 在下标 2 处分割 nums 。那么第一部分为 [2,3,1] ,和为 6 。第二部分为 [0] ,和为 0 。因为 6 >= 0 ,所以 i = 2 是一个合法的分割。\n\n\n
\n\n
提示:
\n\n2 <= nums.length <= 105
-105 <= nums[i] <= 105
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