Runtime1 msBeats96.95%
Memory43 MBBeats49.21%
#N443. String Compression
problem link
#solution

class Solution {
    public int compress(char[] chars) {
        String s;
        StringBuilder sb = new StringBuilder();
        int count=1;
        for(int i=1; i<chars.length; i++){
            if(chars[i]==chars[i-1]){
                count++;
            }else{
                sb.append(chars[i-1]);
                if(count!=1) sb.append(count);
                count=1;
            }
        }
        
        sb.append(chars[chars.length-1]);
        if(count!=1) sb.append(count);
        s=sb.toString();
        for(int i=0; i<s.length(); i++){
            chars[i]=s.charAt(i);
        }
        return s.length();
    }
}