First, make sure I have right number of candy when compared to my left kid.

Then, make sure I have the right number of candy when compared to my right kid.

```
class Solution:
# @param ratings, a list of integer
# @return an integer
# 5:46
def candy(self, ratings):
if not ratings:
return 0
n = len(ratings)
candy = [1] * n
for i in range(1, n):
if ratings[i] > ratings[i - 1]:
candy[i] = candy[i - 1] + 1
for i in range(n - 2, -1, -1):
if ratings[i] > ratings[i + 1] and candy[i] <= candy[i + 1]:
candy[i] = candy[i + 1] + 1
return sum(candy)
```