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?

看网上才做出来的，自己想的方法太复杂，网上大家做法基本一样，先从左往右处理左邻居的关系，再从右往左处理右邻居的关系

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