Interview question 01.05. Primary editing

Subject requirements ：
There are three editing operations for Strings : Insert an English character 、 Delete an English character or replace an English character . Given two strings , Write a function to determine if they only need to be done once ( Or zero times ) edit .

 Example  1:

 Input : 
first = "pale"
second = "ple"
 Output : True
 
 Example  2:

 Input : 
first = "pales"
second = "pal"
 Output : False

class Solution {
    
public:
    bool oneEditAway(string first, string second) {
    
    int s1, s2;
    s1 = first.size();
    s2 = second.size();
    int len = s1 - s2;
    if(len < 0) return oneEditAway(second, first);// Ensure that the first string is longer 
    if(len > 1) return false;// If the length difference between two strings exceeds 2, Then return to 
    int i = 0, j = 0, s = 0;//s Indicates unequal numbers of letters 
    while(i < s1 && j < s2)// Traverse two strings 
    {
    
        if(first[i] != second[j])
        {
    
            s++;// If the letters are not equal ,s+1
            if(len == 1)// Consider separately when the length of two strings is different 
            {
    
                i++;
                continue;
            }
        }
            i++;
            j++;
    }
    if(s < 2)
        return true;
    else
        return false;
    }
};