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func transpose(A [][]int) [][]int {
    w, h := len(A), len(A[0])
    newA := make([][]int, h)
    for i := 0; i < h; i++ {
        newA[i] = make([]int, w)
    }
    for i := 0; i < w; i++ {
        for j := 0; j < h; j++ {
            newA[j][i] = A[i][j]
        }
    }
    return newA
}