class Solution {
public:
    int findPoisonedDuration(vector<int>& timeSeries, int duration) {
        int ans = 0;
        int tmp = 0;
        for(auto num : timeSeries)
        {
            if(num>=tmp)
            {
                ans += duration;
            }
            else
            {
                ans += num+duration-tmp;
            }
            tmp = num+duration;
        }
        return ans;
    }
};