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?

 

就是个坑啊！

首先，竟然允许相邻的2个人同样ranking！！！！他们还怎么做朋友！

其次，对于ranking为 123333321的这组，你猜~~~

class Solution {
public:
    int candy(vector<int> &ratings) {
        int size = ratings.size();
        vector<int> num(size,1);
        vector<int> min;
        if(size == 1)return 1;
        if(size == 2)
        if(ratings[0]==ratings[1])return 2;
        else
        return 3;

        for(int i = 1 ; i < size-1 ;i++)
        {
            if(ratings[i-1]>=ratings[i] && ratings[i] <= ratings[i+1])min.push_back(i);
        }
        int i=0;
        while(i+1<size && ratings[i+1] >= ratings[i])
        {
            if(ratings[i+1] == ratings[i])
            //num[i+1] = 1;
            ;
            else
            num[i+1] = num[i]+1;
            i++;
        }
        i = size -1;
        while(i>=1 && ratings[i-1] >= ratings[i])
        {if(ratings[i-1] == ratings[i])
        //num[i-1] = 1;
        ;
        else 
        num[i-1] = num[i]+1; i--;}
        
        for(int j = 0 ; j < min.size(); j++)
        {
            int t = min[j];
            i=t;
            while(i >= 0 && ratings[i-1] >= ratings[i])
            {
                if(num[i -1] <= num[i])
                if(ratings[i-1] == ratings[i])
                //num[i-1] = num[i]
                ;
                else
                num[i-1] = num[i]+1;
                
                i--;
            }
            
            i=t;
            while(i <size && ratings[i+1] >= ratings[i])
            {
                if(num[i +1] <= num[i])
                if(ratings[i+1] == ratings[i])
                //num[i+1] = num[i]
                ;
                else
                num[i+1] = num[i] +1;
                
                i++;
            }
        }
        int re = 0;
        for( i = 0 ; i < size ;i++)
        re += num[i];
        return re;
    }
};