1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
export default function compress(chars: string[]): number {    let writeindex = 0;
    let count = 0;    let current = "";    for (let readindex = 0; readindex < chars.length; readindex++) {        const char = chars[readindex];
        if (current === char) {            count++;        } else {            flush();
            current = char;            count = 1;        }    }    flush();
    function flush() {        if (current) {            if (count > 1) {                chars[writeindex] = current;                writeindex++;                const lenstring = count.toString();                for (const c of lenstring) {                    chars[writeindex] = c;                    writeindex++;                }            } else {                chars[writeindex] = current;                writeindex++;            }        }    }    return writeindex;}