443. String Compression

static int wing=[]()
{
    std::ios::sync_with_stdio(false);
    cin.tie(NULL);
    return 0;
}();

class Solution 
{
public:
    int compress(vector<char>& chars) 
    {
        
        int count=0;
        int i=0,j=0;
        int sz=chars.size();
        while(j<sz)
        {
            count=0;
            char cur=chars[j];
            while(chars[j]==cur)
            {
                count++;
                j++;
                if(j==sz)
                    break;
            }
            if(count==1)
            {
                chars[i++]=cur;
                continue;
            }
            chars[i]=cur;
            i++;
            string s=to_string(count);
            for(char c:s)
                chars[i++]=c;
        }
        return i;
    }
};

 双指针扫描字符串并压缩