One Edit Distance

Given two stringss andt, determine if they are both one edit distance apart.

Note:

There are 3 possiblities to satisfy one edit distance apart:

1. Insert a character into s to get t

2. Delete a character from s _to get t_

3. Replace a character of s to get t

Example

Example 1:

Input:
s = "ab", 
t = "acb"

Output: true

Explanation:
 We can insert 'c' into s
 to get t.

Example 2:

Input:
s = "cab", 
t = "ad"

Output:
 false

Explanation:
 We cannot get t from s by only one step.

Example 3:

Input:
s = "1203", 
t = "1213"

Output:
 true

Explanation:
 We can replace '0' with '1' to get t.

Note

当当前位置不一样的时候，根据三种情况分别比较substring

edge case 长度差一，最后多一位，最后判断一下

Math.abs(s.length() - t.length()) == 1;

Code

public boolean isOneEditDistance(String s, String t) {
    for (int i = 0; i < Math.min(s.length(), t.length()); i++) {
        if (s.charAt(i) != t.charAt(i)) {
            if (s.length() == t.length()) {
                return s.substring(i + 1).equals(t.substring(i + 1));    
            } else if (s.length() > t.length()) {
                return s.substring(i + 1).equals(t.substring(i));
            } else {
                return s.substring(i).equals(t.substring(i + 1));
            }
        }
    }
    return Math.abs(s.length() - t.length()) == 1;
}