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public class Solution {
    public int findPoisonedDuration(int[] timeSeries, int duration) {
        if (timeSeries == null || timeSeries.length < 1) return 0;
        int end = timeSeries[0] + duration;
        int start = timeSeries[0];
        int res = 0;
        for (int i = 1; i < timeSeries.length; i++) {
            if (timeSeries[i] <= end) {
                end = timeSeries[i] + duration;
            } else {
                res += end - start;
                start = timeSeries[i];
                end = timeSeries[i] + duration;
            }
        }
        res += end - start;
        return res;
    } 
}

public class Solution {
    public int findPoisonedDuration(int[] timeSeries, int duration) {
        if (timeSeries == null || timeSeries.length == 0 || duration <= 0)
			return 0;
		int res = 0, start = timeSeries[0], end = timeSeries[0] + duration;
		for (int i = 1; i < timeSeries.length; i++) {
			if (timeSeries[i] > end) {
				res += end - start;
				start = timeSeries[i];
			}
			end = timeSeries[i] + duration;
		}
		res += end - start;
		return res;
    }
}