• 題目

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]]

• 題目大意&解題思路

題目的意思其實就是將陣列的行列互換一下。

• 實現程式碼

vector<vector<int>> transpose(vector<vector<int>>& A) {
        
        vector<vector<int>> res;
        
        for( int i = 0; i < A[0].size(); ++i ){    /*行數*/
            
            vector<int> col;            
            for( int j = 0; j < A.size(); ++j )    /*列數*/
                temp.push_back(A[j][i]);   
            
            res.push_back(col);
        }
        
        return res;
    }
 

• 實驗結果