[LeetCode]#388 Longest Absolute File Path

public class Solution {
    public int lengthLongestPath(String input) {
        if (input == null || input.length() == 0 || !input.contains(".")) {
            return 0;
        }
        
        String[] list = input.split("\n");
        Deque<Integer> stack = new ArrayDeque();
        int curLength = 0;
        int maxLength = -1;
        for (String s : list) {
            int tabs = 0;
            while (s.charAt(tabs) == '\t') {
                tabs++;
            }
            while (tabs < stack.size()) {
                curLength -= stack.pop();
            }
            s = s.substring(tabs);
            if (s.contains(".")) {
                maxLength = Math.max(maxLength, curLength + s.length());
            } else {
                curLength += s.length() + 1;
                stack.push(s.length() + 1);
            }
        }
        return maxLength;
    }
}