One Edit Distance

Given two strings S and T, determine if they are both one edit distance apart.

题意：两个字符串的编辑距离是否为1

代码

class Solution {
     public boolean isOneEditDistance(String s, String t) {
        int m = s.length(), n = t.length();
        if(m == n) return isOneModified(s, t);
        if(m - n == 1) return isOneDeleted(s, t);
        if(n - m == 1) return isOneDeleted(t, s);
        // 长度差距大于2直接返回false
        return false;
    }

    private boolean isOneModified(String s, String t){
        boolean modified = false;
        // 看是否只修改了一个字符
        for(int i = 0; i < s.length(); i++){
            if(s.charAt(i) != t.charAt(i)){
                if(modified) return false;
                modified = true;
            }
        }
        return modified;
    }

    public boolean isOneDeleted(String longer, String shorter){
        // 找到第一组不一样的字符，看后面是否一样
        for(int i = 0; i < shorter.length(); i++){
            if(longer.charAt(i) != shorter.charAt(i)){
                return longer.substring(i + 1).equals(shorter.substring(i));
            }
        }
        return true;
    }
}