leetcode(135)分发糖果

class Solution {
    public int candy(int[] ratings) {
        int len = ratings.length;
        if(len==0){
            return 0;
        }
        int[] cands = new int[len];
        for(int i=0;i<len;i++){
            cands[i] = 1;
        }
        for(int i=0;i<len-1;i++){
            if(ratings[i+1]>ratings[i]&&cands[i+1]<=cands[i]){
               cands[i+1]=cands[i]+1; 
            }
        }
        for(int i=len-1;i>0;i--){
            if(ratings[i-1]>ratings[i]&&cands[i-1]<=cands[i]){
               cands[i-1]=cands[i]+1; 
            }
        }
        int sum = 0;
        for(int i=0;i<len;i++){
            sum += cands[i];
        }
        return sum;
    }
}