[抄题]:
Given two strings S
and T
, return if they are equal when both are typed into empty text editors. #
means a backspace character.
Example 1:
Input: S = "ab#c", T = "ad#c"Output: trueExplanation: Both S and T become "ac".
Example 2:
Input: S = "ab##", T = "c#d#"Output: trueExplanation: Both S and T become "".
Example 3:
Input: S = "a##c", T = "#a#c"Output: trueExplanation: Both S and T become "c".
Example 4:
Input: S = "a#c", T = "b"Output: falseExplanation: S becomes "c" while T becomes "b".
[暴力解法]:
时间分析:
空间分析:
[优化后]:
时间分析:
空间分析:
[奇葩输出条件]:
[奇葩corner case]:
[思维问题]:以为要用stack:可是应该考虑这个占的空间比较大
[英文数据结构或算法,为什么不用别的数据结构或算法]:
统计numOfBlankspaces的个数,然后看i j是否同时倒数到1
[一句话思路]:
[输入量]:空: 正常情况:特大:特小:程序里处理到的特殊情况:异常情况(不合法不合理的输入):
[画图]:
[一刷]:
[二刷]:
[三刷]:
[四刷]:
[五刷]:
[五分钟肉眼debug的结果]:
[总结]:
统计numOfBlankspaces的个数,然后看i j是否同时倒数到1
[复杂度]:Time complexity: O(n) Space complexity: O(n)
[算法思想:迭代/递归/分治/贪心]:
[关键模板化代码]:
[其他解法]:
[Follow Up]:
[LC给出的题目变变变]:
[代码风格] :
[是否头一次写此类driver funcion的代码] :
[潜台词] :
class Solution { public boolean backspaceCompare(String S, String T) { for (int i = S.length() - 1, j = T.length() - 1; ; i--, j--) { for (int numOfBlankspaces = 0; i >= 0 && (numOfBlankspaces > 0 || S.charAt(i) == '#'); i--) { numOfBlankspaces = S.charAt(i) == '#' ? numOfBlankspaces + 1 : numOfBlankspaces - 1; } for (int numOfBlankspaces = 0; j >= 0 && (numOfBlankspaces > 0 || T.charAt(j) == '#'); j--) { numOfBlankspaces = T.charAt(j) == '#' ? numOfBlankspaces + 1 : numOfBlankspaces - 1; } if (i == -1 || j == -1 || S.charAt(i) != T.charAt(j)) return (i == -1) && (j == -1); } }}