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export default function maxScore(s: string): number {    if (s.length === 2) return Number(s[0] === "0") + Number(s[1] === "1");    const prefixSum: number[] = Array(s.length).fill(0);    for (let i = 0; i < s.length; i++) {        prefixSum[i] = (prefixSum[i - 1] ?? 0) + Number(s[i - 1] === "0");    }    const suffixSum: number[] = Array(s.length).fill(0);    for (let i = s.length - 1; i >= 0; i--) {        suffixSum[i] = (suffixSum[i + 1] ?? 0) + Number(s[i] === "1");    }
    return Math.max(        ...Array(s.length - 1)            .fill(0)            .map((_, i) => prefixSum[i + 1] + suffixSum[i + 1]),    );}