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;
}