Candy

There are N children standing in a line. Each child is assigned a rating value.

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. What is the minimum candies you must give?

https://leetcode.com/problems/candy/

Solution:

public class Solution { public int candy(int[] ratings) { if (ratings.length == 0) { return 0; } int[] res = new int[ratings.length]; res[0] = 1; for (int i = 1; i < ratings.length; i++) { if (ratings[i] > ratings[i-1]) { res[i] = res[i-1] + 1; } else { res[i] = 1; } } int count = res[ratings.length-1]; for (int i = ratings.length-2; i >= 0; i--) { if (ratings[i] > ratings[i+1]) { res[i] = Math.max(res[i+1] + 1, res[i]); } count += res[i]; } return count; } }