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export default function partitionString(s: string): number {    let set = 0;    let res = 0;    for (const c of s) {        if (            set & (1 << c.charCodeAt(0) - "a".charCodeAt(0))        ) {            res++;
            set = 0;        }
        set |= 1 << c.charCodeAt(0) - "a".charCodeAt(0);    }    return res + 1;}