Question
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 <= 1000
1 <= A[0].length <= 1000
Difficulty:Easy
Category:Array
Analyze
How can we solve this problem in-place.
- In-Place Inverse Perfect Shuffle
Solution
class Solution {
public:
vector<vector<int>> transpose(vector<vector<int>>& A) {
int m = A.size(), n = A[0].size();
vector<vector<int>> res(n, vector<int>(m, 0));
transpose(A, res, m, n);
return res;
}
void transpose(vector<vector<int>>& a, vector<vector<int>>& b, int rows, int cols) {
for (int i = 0; i < rows; i++) {
for (int j = 0; j < cols; j++) {
b[j][i] = a[i][j];
}
}
return;
}
};