135. 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?

求需要发的最小的糖果数。要求每个小孩都要有一颗，并且等级高的小孩要比旁边的多。这里要注意相邻的同等级的糖果数可以不一样。对给出的等级vector，正向遍历一次，反向遍历一次就能得到答案。纪念第一次100%。。。

代码：

class Solution
{
public:
	int candy(vector<int>& ratings)
	{
		int res=0,n=ratings.size();
		vector<int>nums(n,1);
		for(int i=1;i<n;i++)
		{
			if(ratings[i]>ratings[i-1])
			{
				nums[i]=nums[i-1]+1;
			}
		}
		for(int i=n-2;i>=0;i--)
		{
			if(ratings[i]>ratings[i+1])
			{
				nums[i]=max(nums[i+1]+1,nums[i]);
			}
		}
		for(int i=0;i<n;i++)
		{
			res+=nums[i];
		}
		return res;
	}
};