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Java-based LeetCode algorithm problem solutions, regularly updated
135\. Candy
Hard
There are `n` children standing in a line. Each child is assigned a rating value given in the integer array `ratings`.
You are giving candies to these children subjected to the following requirements:
* Each child must have at least one candy.
* Children with a higher rating get more candies than their neighbors.
Return _the minimum number of candies you need to have to distribute the candies to the children_.
**Example 1:**
**Input:** ratings = [1,0,2]
**Output:** 5
**Explanation:** You can allocate to the first, second and third child with 2, 1, 2 candies respectively.
**Example 2:**
**Input:** ratings = [1,2,2]
**Output:** 4
**Explanation:** You can allocate to the first, second and third child with 1, 2, 1 candies respectively. The third child gets 1 candy because it satisfies the above two conditions.
**Constraints:**
* `n == ratings.length`
* 1 <= n <= 2 * 104
* 0 <= ratings[i] <= 2 * 104