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?

两遍遍历，使得左右邻居都合法

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

TODO------DP : http://fisherlei.blogspot.com/2013/11/leetcode-candy-solution.html