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