leetcode

class :
    def transpose(self, A: List[List[int]]) -> List[List[int]]:
        r = len(A)
        c = len(A[0])
        B = []
        for _ in range(c):
            B.append([0] * r)
            
        for i in range(r):
            for j in range(c):
                B[j][i] = A[i][j]
        
        return B