Transpose Matrix

Transpose Matrix

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. 1 <= A.length <= 1000

2. 1 <= A[0].length <= 1000

Solutions

🧠 Cpp

class Solution
{
public:
    vector<vector<int>> transpose(vector<vector<int>>& A)
    {
        const size_t  new_length = A.size(),
                      new_height = A[0].size();
        vector<vector<int>> res;
        res.resize(new_height);
        for(auto &v : res)
            v.resize(new_length);

        for(size_t i = 0; i < new_length; ++i)
            for(size_t j = 0; j < new_height; ++j)
                res[j][i] = A[i][j];

        return res;
    }
};