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export default numSpecial;function numSpecial(mat: number[][]): number {    const rowsum = mat.map((a) => a.reduce((q, v) => q + v, 0));    const colsum = mat[0].map((_, i) => mat.reduce((q, v) => q + v[i], 0));
    let ans = 0;
    mat.forEach((a, i) =>        rowsum[i] === 1 &&        a.forEach((v, j) => ans += Number(v === 1 && colsum[j] === 1))    );
    return ans;}