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Given a matrix A, return the transpose of A.
The transpose of a matrix is the matrix flipped over it's main diagonal, switching the row and column indices of the matrix.
Example 1:
Input: [[1,2,3],[4,5,6],[7,8,9]] Output: [[1,4,7],[2,5,8],[3,6,9]]
Example 2:
Input: [[1,2,3],[4,5,6]] Output: [[1,4],[2,5],[3,6]]
Note:
1 <= A.length <= 10001 <= A[0].length <= 1000
class Solution {
public:
vector<vector<int>> transpose(vector<vector<int>>& A) {
int M = A.size(), N=A[0].size();
vector<vector<int>>B(N,vector<int>(M,0));
for (int j = 0 ; j<N;j++)
for (int i = 0 ; i<M;i++)
B[j][i] = A[i][j];
return B;
}
};
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