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export default function (t: string): number {    const n = t.length;    let e = 0;    let l = 0;    for (let o = 0; o < n; o++) {        const n = t[o];        let r = e;        let a = Math.min(e, l);        "1" === n ? r++ : a++;        e = r;        l = a;    }    return Math.min(e, l);}